or SOUTHERN INDIA. 171 



3. Cytheuea Arcotensis, Forbes, sp., PI. XVI, Eig. 34, 



1846. Venus Arcotensis, Forbes, Trans., Geol. Soc, London, vii, p. 146, pi. xv, fig. 19. 

 1850. Astarte id., d'Orbignj-, Prod, ii, p. 238. 



" Testa orblculari, subobl/qua, incequilaterali, plus miniisve convexa, polita 

 concentrice stinata, striis confertis irregularibus, margine Icevi, timbonibus prominenti- 

 bus, hmula minuta'^ (Forbes loc. cit.J. 



Such is the account of this species given by Forbes. I cannot identify it with 

 any of our Indian shells, and, therefore, reproduce his flgvire. It is a remarkably 

 orbicular form. I examined the original specimen in London, and find in my 

 notebook the only remark, "figure of Forbes good; it is not an Astarte, as 

 suggested by d'Orbigny, but a Cytherea, with three cardinal and one lunular 

 tooth in the left valve, the last not very oblique and with its base close to the 

 most anterior cardinal." I thought that the species could be Gyth. plana, but the 

 form does not at all agree with it ; nor could it be Cyprimeria Oldhamiana, which 

 has nothing like what could be mistaken for a lunular tooth in the left valve. 

 It is to be hoped that further discoveries will elucidate this point. The only species 

 remaining with which it could be compared are those of the Circe group. 



"Locality. — Tiichiuopoly." 



4. Cytherea lassula, Stoliczka, PI. VII, Figs. 10-17. 



Cytli. testa elongato-ovata, tumescente, umbonibus prominuUs, acutis, approxi- 

 matls et paultilmn incin^vis instritcta, antice rotundata, postice angxistatim truncatula ; 

 declivitate stiperidt-i antica (sen Immlarij brevi, moderate excavata, postica (seu arealij 

 longiori, convexiuscula ; margine inferiorl convexo, versus terminationem posticam 

 paululum insimiato ; superficie striis concentricis sulcis nonnullis latioribus interpositis 

 notata, striis minutis aliquando obsoletis ; lumila ovato-elongata, antice acuta, tinea, 

 hnpressa marginata, fere plana. Cardo in utraque valea dentibus cardinalibus jilus 

 minusve distincter furcatis (imprimis dent, posticis) instructus ; dente limulari in val. 

 sinistra tenui, elongato, margini lunulari parallelo, in valva dextra fossce elongatos 

 supra ac infra crassiuscule marginatce congruente ; sinu pallii brevi, obtuso, 

 ascendente. 



Length of the largest specimen ,., ... ... 36 m. m. 



Height : length ... ... ... ... 077 -0-83 



Thickness : height ... ... ... ... 0-60 -0-64 



Shell elongated, ovoid, rather tumid and strong, covered with fine concentric 

 striae, which in places, especially towards the margin, alternate with broad sulci ; 

 sometimes the finer stria3 become quite obsolete, but this is likely only due to the 

 preservation of the surface. The beaks are prominent, pointed, close together and 

 slightly incurved towards the long, elliptical lunule, which is very little raised or 

 fiat, but margiued with a deep line. The lunular margin is slightly concave, the 



