144 CRETACEOUS LAMELLIBRANCHTA. 



1813. Venus lineolata, J. Sowerby. Min. Conch., vol. i, p. 57, pi. xx (upper 



figure) . 

 1828. J. Fleming. Hist, Brit. Animals, p. 449. 



1836. Cyprina rostrata, /. de C. Sowerly. Trans. G-eol. Soc, ser. 2, vol. iv, pp. 



240, 341, pi. xvii, fig. 1. 

 183G. Cytherea lineolata, Sowerby. Ibid., p. 240. 

 1850. Cyprina rostrata, A. cVOrbigny. Prodr. de Pal., vol. ii, p. 161. 

 1854. J. Morris. Cat, Brit, Foss., ed. 2, p. 199. 



1854. Cytherea lineolata, Morris. Ibid., p. 200. 



1865. Cyprina rostrata, F. J. Pictet and G. Campielie. Foss. Terr. Cret, Ste. Croix 



(Mater. Pal. Suisse, ser. 

 4), pp. 222, 229. 

 1870. F. StoliczJca. Palaeont. Indica, Cret. Fauna S. India, 



vol. iii, p. 193 (Venilicardia). 

 1907. lineolata, B. B. Newton. Proc Malacol. Soc, vol. vii, p. 284, 



pi. xxiv, fig. 14. 



Non 1844. A. d'Orligny. Pal. Franc. Terr. Cret,, vol. iii, p. 98, 



pi. eclxxi (Cyprina neocomiensis, 

 d'Orbigny, Ibid., p. 759). 



asurements .- 













(i) 



(2) 



(3) 



(4) 



Length 



71 



(X 



6G 



52 mm 



Height 



Gl 



60 



(1 — 4) Blackdown. 



58 



43 „ 



Affinities. — This species differs from G. angulata in its more prominent and 

 more strongly curved nmbones, in the shorter posterior margin and the greater 

 slope of the postero-dorsal margin, and in the more deeply depressed lunular 

 region. The hinge also differs : in the right valve the median cardinal tooth is 

 distinctly separated from the anterior cardinal and is dorsal to the latter and 

 continuous with the posterior cardinal tooth ; the latter is either undivided or the 

 division is indistinctly shown. 



Remarks. — G. lineolata varies considerably in the prominence and curvature of 

 the umbones, and, as a result, in the outline of the shell. An extreme form was 

 figured by J. de C. Sowerby as the type of C. rostrata ; in specimens in which the 

 umbones are less prominent and their anterior curvature less pronounced the out- 

 line of the shell becomes less triangular, and in some cases approaches that of C. 

 a/ngulata, but the differences in the hinge of the right valve and the greater depth 

 of the lunular region appear to be present in all specimens. The average size of 

 this species is considerably less than that of 0. angulata. 



The type of Venus lineolata, Sowerby (V. castrensis, Parkinson), from Black- 

 down, agrees with the normal forms of C. rostrata, except for the presence of 



