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XVII.—On some Cretaceous Echinoidea from the Neighbourhood of Lobito Bay

Published online by Cambridge University Press:  06 July 2012

J. W. Gregory
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Extract

Nine species of Echinoidea were described by De Loriol From Benguella and mainly from the neighbourhood of Dombe Grande.

1. One of his species, Epiaster catumbellensis, is common in the Lobito district. It is recorded by Be Loriol from the Inflata beds at Catumbella, and the younger Cyprina ivensi sandstone at Dombe Grande. It is a variable species. According to the dimensions given by De Loriol, the length varies from 25 to 36 mm., and the breadth varies from 88 to 94 per cent, of the length and the height from 66 to 77 per cent, of the length. His illustrations show that the species has two chief forms: in one the shape is depressed and the posterior margin is nearly vertical; in the other the posterior interambulacrum is subcarinate, and the posterior margin is more sloping owing to the projection of the lower posterior corner. In De Loriol's figure, pl. viii, No. 4, the posterior margin has a slope of only 7° from the vertical; in his fig. 5 this slope is 15° from the vertical.

Type
Research Article
Information
Earth and Environmental Science Transactions of The Royal Society of Edinburgh , Volume 51 , Issue 3 , 1917 , pp. 585 - 587
Copyright
Copyright © Royal Society of Edinburgh 1917

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References

page 585 note * In Choffat, and Loriol, De, “Matériaux pour l'étude stratigraphique et paléontologique de la province d'Angola,” Mém. Soc. Phys. Hist. Nat. Genève, vol. xxx, 1888, 116 pp., 8 platesGoogle Scholar.

page 585 note † Ibid., pp. 112-114, pl. viii, figs. 3-6.

page 585 note ‡ Dimensions are in mm.:—1. = length; b. = breadth; h. = height.

page 586 note * Op. cit., pp. 100-102, pl. vi, figs. 2-4.