290 CHETACEOUS PELECYPODA 



Ast. s/milis (vide Zittel iu Deuksch. Akad., Wien, xxiv, pt. ii, p. 157, pi. 8, fig. 6), 

 thougli I am not certain whether the two forms are really specifically distinct. 

 Miiller's ctelata does not differ by its triangular form from s/;«i^i«, as would be 

 expected from that author's figure, but both are almost quite identical in form. 



Locality. — Monglepaudy, in a grey calcareous sandstone ; apparently very rare. 



Formation. — Ootatoor group. 



2. GouLDiA TRiGONioiDES, StoUczlca, PL X, Eigs. 4-8. 



G. testa sab-triaiigiilari, postice conspicuiter angiistata et ad terminationpm 

 truncata, moderate comprcssa sen jjaeilo tnmidula, angulo p>lus minusve distincto ab 

 umbonibus ad marglnem poster o-inferior em decurrente notata, costulls 10-12 crassi- 

 usculis concentricis, in regione Itmutari et areali obsoletis ornata, margine interna 

 mimitissime denticulato ; cardine in valvula dextra dentibiis tribus cardinalibus, 

 duobus auterioribtis crassis siib-ceqnalibiis, postico snb-obsoleto, et una longo laterali 

 antico instrticto ; impressionibus m?isctUarlbt(s profttitdis, ovatis, imp. postica 

 paululum majore qiiain antica. 



Height of shell : its length ... ... ... 078 - 0-82 



Thickness „ : „ ... ... ... 0'55 - 060 



This species is readily recognised by its posterior narrowly truncate foiin. 

 The thickness of the shell varies, and so does also the number of the ribs, but 

 even if the latter are present in nearly as small a number as in G. lilanissima, 

 there is always in the present species a slightly raised angular ridge observable 

 extending from the beaks to the postero-inferior margin. Some of the more 

 elongated specimens strongly resemble small concentrically ribbed species of 

 Trigonia. The lunula and area are always well marked and siu-rouuded with 

 raised sharp edges, the ribs not extending on them. The hinge has in the right 

 valve the two anterior cardinal teeth about equally strong and the posterior is 

 almost obsolete, while in planissima the anterior cardinal is much smaller than 

 the central one. 



Locality. — East of Anapaudy, in brownish sandstone ; not common. 



Formation. — Trichinopoly group. 



CARDITA, Brug., 1789, (seep. 283). 

 1. Caudita Jaquinoti, d'Orb., PL X, Eigs. 15-21. 



1846. Cardita orbicularis, Forb., Trans., Geol. Soc, London, vii, p. 114, pi. xvii, fig. ll,(nnn idem. Sow., 1825). 



1846. „ striata, „ „ „ „ „ „ „ pi. xiv, fig. 1, (nou idem. Sow., 1815) 



1847. Cardium Jaquinoti, d'Orb., Voy. Astrolabe, Pal., pi. v, figs. 23-25. 



1850. Cardium Jaquinoti, siih-striatum et orhicularc, d'Orb., Prod, ii, p. 242; — cadcm auctorum. 



Card, testa orbiciilato quadrangulari, paulo longiore quam alia, tumida, incequi- 

 laterali, umbonibus incurvis, approximatis, fere terminalibu^ instructa, superficie 

 multlcostata, costis ternatis parte mediana ma.vime elevatis et splniilose tuberculatis 

 sulcis profiDidls fere ceqiiidistanlibus separatis ; cardine in vulca dextra dentibus 



