OP SOUTHEEN INDIA. 101 



SILIQUA, Meg,v. Muhlfeld, 1811 (see p. 95). 

 x/" 1. SiLiQUA LiMATA, StoUczka, PI. I, Pigs. 12-13. 



SiL testa valvis elongatis, suh-condexis, valde irKjequilateralibus, antice ac postice 

 subrotundatis atque angustatls, tenuibus, politis, concentrice minute striatis, utraque 

 intus sub-umbone costa crassiuscula oblique postice versus fere ad marginem ventrale^n 

 decurrente instructa. 



Height of shell : its length ... ... ... ... o-32 



This species is closely allied to S, Peter si, Eeuss, from the Alpine Gosau 

 formation, but is narrower in proportion to its length and the valves are per- 

 ceptibly more convex. The posterior end of the valves is extremely thin and breaks 

 off' very easily, in which case the shell appears to be rather more truncate than 

 it IS naturally. The rib under the umbones is very strong as compared with the 

 size of the shell. Of the hinge only indistinct impressions are traceable, the 

 teeth themselves must have been very minute. 



Locality. — South-east of Parchairy and Garudamungalum ; at both localities 

 m a compact highly calcareous brownish or bluish sandstone, in company with a 

 very large number of small shells. 



Formation. — Trichinopoly group. 



PHARPLLA, Gray, 1854, (see p. 96). 

 ^ 1. Pharella delicatula, Stoliczka, PI. I, Pig. 14. 

 Fh. testa elongata, angusta, tenuissima, valde incequilaterali, antice siib-rotundata, 

 postice oblique truncata, marglne dorsali ac ventrali fere parallelis, umbonibus paulo 

 pjrominulis, linea elevata ab umbonibus oblique postice ac antice decurrente, prima 

 distinct a, altera fere obsoleta ; superficie lineis concentricis minutis notata ; impres- 

 sione musculari antica pyriformi, postica angustata ac elongata. 



Height of one valve : its length ... ... ... ... 0*26 



This is a remarkably thin shell ; in form and the shape of the muscular im- 

 pressions it agrees with a narrow species of Fharella, The pallial sinus appears to 

 have been very short, but is not clearly traceable on any of our specimens ; neither 

 was it possible to observe the hinge-teeth. 



Locality, — South-east of Parchairy. 



Formation, — Trichinopoly group. 



/ 2. Pharella obscura, Forb., sp., PI. 1, Pig. 15. 



1846. Solecitrtus ohscurus, Forbes, Trans., Greol. Soc, London, vii, p. 141, pi. xvii, fig. 3 — idem anctorum. 



Fh. testa elongata, valde incBquilaterali, umbonibus prominulis, acutis, eorumque 

 mdrgine ventrali opposito lente insinuato instructa, antice rotundata, postice oblique 

 trimcata ; superficie striis concentricis, crassioribus et tenuioribus ornata ; impres- 

 sione musculari antica atque postica pyriformi, prima breviorl, altera elongata; sinu 

 pallii brevi. 



Height of shell : its length ... ... ... ... 0-30 



The compressed, elongated, and rather high shell, ornamented with coarsely 

 lamellar concentric striae, is very characteristic for this species. It has been 



2 B 



