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Published online by Cambridge University Press: 03 November 2016
1. This is a sequel to a paper with similar title (Gazette, Vol. XXXI, pp. 270-8), which will be referred to as C.T. (I). It concerns Case I (§§ 8-11). For clearness of diagrams, a new shape of triangle has been used; and, to avoid confusion with previous results, and to suit the present development, different letters and suffixes are introduced.