ADDITIONS. 42^ 



Cyi'KIXA Mevkiu, Nj). iinr. Plate LXII, iigs. 2, o. 



[Omitted from Vol. II, p. 141.] 



Description. — Shell convex, oval, considerably inequilateral ; anterior margin 

 rounded, passing gradually into the slightly curved ventral margin; posterior 

 margin truncated ; po3ter(j-(lor.sal margin convex. Umbones prominent, curved 

 inwards and forwards, with a rounded carina extending to the postero- ventral 

 angle, and limiting a flattened postcro-dorsal region. Lunular region depressed. 

 Escutcheon long, deep, limited by a sliarp carina. Ornamentation consists of con- 

 centric growth-rings. Length, 5G mm. ; height, 42 mm. 



Affinities. — This species shows some resemblance to C. bi-niemis (Leymerie),' 

 but is less elono-ate and much less convex. 



Tijpe. — In the Sedgwick Museum, Cambridge (C. J. A. Meyer collection). 



Dixtrilmti'jii. — Lower Greensand (Pt'r;/'(-bed), of Sandown. 



Cypbina? vectiana {Forbes), 1845. Plate LXII, fig. 4. 



[Omitted from Vol. II, y,. U\.] 



1845. Tellina ? VECTIANA, E. Forbes. Quart. Joiiru. Geol. Soc, vol. i, p. 239, 



pi. ii, fig. 2. 

 1854. Tellina vectiana, /. 3/orn'.--. Cat. Brit. Foss., ed. 2, p. 227. 

 1865. " Tellina " vectiana, F. J. Pictet and G. Camjiiche. Terr. Crct. Ste. Croix 



(Matt'r. Pal. Suisse, ser. 4), p. 141. 

 1871. Tellina? vectiana (? Homalina), F. Stoliczka. PalsBont. Indica, Cijet. 



Fauna S. India, vol. iii, p. 128. 



Descri^dion. — Shell triangular, moderately convex, Mitli flattened sides, nearly 

 equilateral. Anterior margin rounded ; ventral margin slightly curved ; postero- 

 dorsal margin slightly convex, forming a rounded angle witli the ventral margin. 

 Umbones prominent, sharp, slightly curved. Lunular region depressed. Escut- 

 cheon long, limited by a rounded carina extending from the umbones to the postero- 

 ventral extremity. Ornamentation consists of numerous strong concentric ribs, 

 separated by narrow grooves. Length, 25 mm. ; height, 1 7 mm. 



Affinities. — This species shows some resemblance to ('. murato, Sowerby, but 

 the shell is much more compressed, and possesses distinct concentric ribs. I am 

 not able to determine whether a postero-lateral tooth was present or not. 



» ' Mem. Soc. gcol. de France,' vol. v (1842), p. 5, pi. v, 6g. 6. D'Orbiguv, ' Pal. Fran?. Terr. Cn't .' 

 vol. iii, pp. 98, 759, pi. celxxi, and ' Piodr. de Pal.,' vol. ii (1850), p. 77. Picli't and Campiclie, ' Terr. 

 Cret. Ste. Croix ' (' Mater. Pal. Suisse,' ser. 4, 1865), p. 212, pi. cxiii, figs 1, 2. 



