OP SOUTHERN INDIA. 233 



furro\Y sliould prove that it has no connexion with the ligament, but is caused by 

 the hinge-rib. 



10. Caprinula, d'Orbigny, 1847, (Pal. franc, terr. cret., iv, p. 187). Shell 

 inequivalve, both valves large, cellular, with internal tubuli; lower or left valve 

 larger, elongated, sub-spiral, with a longitudinal ligamental furrow, at the base of 

 which where it enters the margin of the shell there exist a number of rather larger 

 pits into w4iich the ligament apparently extends, producing an internal cartilage; in 

 front of these so-called cartilage-pits there is a strong cardinal tooth extending down 

 the interior wall of the valve, and there are said to be two cardinal teeth in the 

 free, upper valve, which is smaller and distinctly spiral with an incurved beak. 

 Type, C. Boissyi, d'Orb. 



11. Caprinella, d'Orb., 1847, (1. cit., p. 189). Shell inequivalve, attached 

 valve larger, involute, spiral with a ligamental furrow on the convex side, and appa- 

 rently with numerous cartilage-pits internally, the convex side of the shell being very 

 thick and fibrous, internal part chambered ; free valve smaller, sub-conic, elevated, 

 vvith an eccentric pointed slightly twisted umbo. Type, C. triangtdaris^ Desm. 



List of ceetaceous species. 

 These bave lately been catalogued by Pictet and Campiche in Pal. Suisse 5"^® ser., 4"^^ part., 

 1868, p. 4 et seq., where the respective references to the various species will be found; I shall 

 liave to add but few which have not been included in that list. 

 1= — Diceras Germain and Lorioli, Pict. and Camp. 



3. — D. gaultimmi, Pict. and Uoux, is, on account of the inequality of the valves, more probably 

 a Chama, as Pictet and Campiche also suggest. 



3. — Diceras arietinajdi' Ay all., (non Deluc), from cretaceous rocks, is supposed to be a Caprhia. 

 4. — D. Favri, Sharpe, is most likely a Requieuia, but distinct from R. Lonsdalii. 

 ( Diceras guttata, Sharpe apud Gabb, is DiancJwra? guttata, Sharpe, and does not belong 

 to the present family). 



5. — Requienia Jaccardi and eury stoma, Pict. and Camp. 



6-10. — R. Lonsdalii, ^Qv^.,^-^., ammonia, (^o\^i., sp., grypJioides, Math., lamello&a, d'Orb. 

 Grasiana, Mortillet. 



11-22. — R. rugosa, navis, Delarueana, ornata, Icevigata, Carentonensis, carinata, Toucasiana, 

 Archiaciayia, sutj-aqualis, Michelini, and Marticensis, are described by d'Orbigny. 



Vd.~-Req. Cijplyana, Ryck., is quoted by Bosquet from the upper cretaceous beds of Bergen 

 (vide Staring^'s Bodem van Nederland, ii deel). 



24.—^^^. Lithuana, Eichw., (Leth ross., livr. x, p. 362,) was originally described as Acardo ; 

 it differs from both, Requienia and Caprotina, by its short straight beaks, and very likely does not 

 belong to this family. 



25. Req, texana, Bomer. Meek retains this species in Caprotina, originally described by 

 Bomer under that generic name, but it appears more likely to be a Requienia. 



U-^'^.—IIonopleura corniculum., Valangiensis, and Valdensis, Pict. and Camp. 



99.36._if. varians, Math., Michailensis, Pict. and Camp., deprcssa, Math., trilohata,^' 0,\,, 

 sp., imbricata, sulcata and Marticensis, Math., Plauensis, Geinitz, sp. 



37.— if. texana, Bomer, has been transferred by Gabb to Caprotina, as Cap, Romeri, and by 

 Pictet and Campiche to Req:uienia. The species could belong to either of the genera, but viewing 

 it externally it does not appear to differ in the least from Chamosirea, 



