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I.—Cirripedes from the Trimmingham Chalk and other localities in Norfolk

Published online by Cambridge University Press:  01 May 2009

Henry Woodward
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Extract

Some years since Mr. Reginald M. Brydone, F.G.S., placed in my hands a number of fossil Cirripedes from the Chalk of Trimmingham, Norfolk, with the request that I would describe them. Others have lately been sent to me by Mr. Clement Reid, F.R.S., from his private collection and from the Geological Survey Museum; also a set of Chalk Lepadidæ from Dr. Arthur Rowe, F.G.S., of Margate, collected by him in the vicinity of Norwich. I now take up the study of these too long neglected specimens.

Type
Original Articles
Information
Geological Magazine , Volume 3 , Issue 8 , August 1906 , pp. 337 - 353
Copyright
Copyright © Cambridge University Press 1906

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References

page 337 note 1 For an account of this interesting deposit see “ The Stratigraphy and Fauna of the Trimmingham Chalk,” by Brydone, R. M., 1900, 8vo, pp. 16Google Scholar, with diagrams; Dulau & Co., price 1s. (separately published). Also “Further Notes on the Trimmingham Chalk, Norfolk,” by Brydone, R. M., F.G.S., Geol. Mag., 1906, January, pp. 13–22Google Scholar, Plates II and III; February, pp. 72–78, Plates IV and V; March, pp. 124–131, Plates VIII and IX; and July, pp. 289–300.

page 337 note 2 Geol. Mag., 1868, pp.258, 259Google Scholar, Pl. XIV, Figs. 1, 2.

page 337 note 3 Geol. Mag., Dec. IV, Vol. VIII (1901), pp. 145–152Google Scholar, Pl. VIII, Figs. 3, 4.

page 338 note 1 See “ Die Cirripedien und Ostracoden der Weissen Schreib-kreide der Insel Rügen,” von Dr. Th. Marsson, in Greifswald. Mittheil. aus dera Naturwiss. Vereine von Neu-Vorpommern und Rügen in Greitswald. Redigirt von Dr. Th. Marsson, 1880, p. 24, Taf. ii, fig. 7a.

page 338 note 2 Referring to the genus Pollicipes, Leach, 1817, adopted by Darwin in his “Monograph on the Fossil Cirripedia” (Pal. Soc., 1851, p. 47), that author observes: ” This is one of the rare cases in which, after much deliberation and with the advice of several distinguished naturalists, I have departed from the rules of the British Association; for it will be seen that Mitella of Oken and Ramphidiona of Schumacher are both prior to Pollicipes of Leach; yet as the latter name is universally adopted throughout Europe and North America, and has been extensively used in geological works, it has appeared to me to he as useless as hopeless to attempt any change. It may he observed that the genus Pollicipes was originally proposed by Sir John Hill (‘History of Animals,’ vol. iii, p. 170) in 1752, but as this was before the discovery of the binomial system, by the rules it is absolutely excluded as of any authority. In my opinion,” under all these circumstances, it would be mere pedantry to go back to Oken's ‘Lehrbuch der Naturgesch.’ for the name Mitella,—a work little known, and displaying entire ignorance regarding the Cirripedia.”

page 339 note 1 I do not find any very close analogy between M. Bosquet's Mitella lithotryoides and the living genus Lithotrya, which is a burrowing Cirripede, lodged in cavities bored in calcareous rocks, shells, or corals, having the lower part of the peduncle quite naked, the upper margin being covered by two rows of square non-imbricate scales, followed by several rows of minute separate stellate plates, each row becoming less and less in size until they disappear almost altogether. In M. lithotryoides the scales are numerous, close set, and imbricated. The valves of the capitulum have a very close agreement with Brachyiepas cretacea, H. Woodw., and, as I hope to show, also with B. (Pollicipes) fallax. I propose therefore, if permissible, to discard the specific name lithotryoides, and would suggest that of B. Bosquetii, in compliment to the author, as less misleading and more appropriate to the species.

page 340 note 1 Darwin, , Fossil Lepadidæ: Pal. Soc. Mon., 1851, p. 48.Google Scholar

page 340 note 2 The letters attached to the valves in Pollicipes mitella (Fig. B) correspond to the names on the valves in Scalpellum (Fig. A) placed beside it.

page 342 note 1 After Darwin's monograph, p. 75.

page 343 note 1 This does not hold good in a number of specimens. Thus, the upper carinal margin in four specimens measures 8, 9, 10, and 11 mm.; whilst the lower margin in the same specimens measures 8, 11, 11, and 10 mm.; so that the relative length of the margin and also the degree of curvature varies considerably.

page 343 note 2 The basal angle in a number of terga of this species, instead of being broad and rounded, is narrow and rather pointed. I am, however, inclined to consider these only trivial variations and of no real specific importance.

page 344 note 1 In his description of Mitella fallax from the Maestrieht Chalk, Mons. Bosquet says these latera are three times as long as the largest of the lower -whorls and many times larger than those of the lowest and smallest series, op. cit., p. 20. On his pl. ii, figs, 7a, b (op. cit.), Bosquet figures a latus precisely similar to Mr. Brydone's specimen from Trimmingham, Figs. 21, 22, supra.

page 345 note 1 “ Mittheilungen aus dem NaturwissenschaftlichenVereine Ton Neu-Vorpommern und Rügen in Greifswald,” von Dr. Th. Marsson, xii–xviii, Berlin, 1880.

page 348 note 1 It compares very well with the carinal latus in the living Scalpellum striolatum of Sars taken between Norway and Faeroe Island (see Gruvel, A., Mon. Cirripedes, 1905, p. 64, fig. 7)Google Scholar.