120 Prof. E. Forbes on Fossil Invertehrata from Southern India. 



with a crenated margin like a Solarium. The mouth is oblique and quadrangular. 

 The cast is smooth. 



Locality, Pondicherry, This species approaches more nearly certain recent 

 Trochi than any fossil ones with which I am acquainted. 



2. Trochus radiatulus, sp. nov. PI. XIII. fig. 1 1 . 



T. testa conoidea, anfractibus (6) tumldis, ad suturatn depressis, oblique striatisque (striis 

 subdistantibus), in medio lasvigato ; ultimo anfractu margine subangulato ; umbilico margine 

 subcrenulato ; basi convexiuscul^, radiato-striato ; aperture subangulata. 



Height 0/2 inch. Breadth 0^^ inch. 



A very pretty little species, resembling the recent Trochus Adansoni in general 

 aspect. The whorls are tumid and slightly flattened at their summits, where they 

 are ornamented by rather distant, oblique, deep radiating striae ; these are con- 

 tinuous with fine lines of growth, which run across the apparently smooth sides, 

 and on the basal whorl meet and again become deep around the umbilicus. The 

 aperture is slightly angulated. 



Locality, Pondicherry. 



3. Trochus Rajah, sp. nov. PI. XIII. fig. 12. 



T. testa conoidea, anfractibus (6) tumidis, subangulatis, superne depressis, obliqu^-plicatis, 

 plicis distantibus (in anfractibus superioribus incompletis) longitudinaliter sulcato-striatis ; 

 basi convexA ; apertura quadrangular!. 



Height 1 inch. Breadth Oy§ inch. 



A conical Cirrus-like species, presenting very distinct characters. The whorls 

 are ventricose and slightly angulated. The shell is ornamented with oblique 

 distant folds crossed by spiral sulcations. The base appears to have been slightly 

 perforated ; the aperture is quadrangular. The crest is quite smooth and slightly 

 undulated beneath the folds. In the specimen preserved very little of the shell 

 remains. 



Locality, Pondicherry. 



4. Trochus rotelloides, sp. nov. PI. XIII. fig. 10. 



T. testa depressissima, spiraliter striata, anfractibus superioribus planis, ultimo compresso 

 rotundato ; basi umbilicata, spiraliter striata. 



Height Oj% inch. Breadth l^^^ i'^ch. - , 



A much-depressed Rotella-like shell, but having a deep and well-marked um- 

 bilicus. Above it is lenticular, and the suture very shallow : beneath it is slightly 

 convex. The entire shell appears to have been spirally grooved. The only specimen 

 is not in good state. It is, however, easily distinguished from any of its allies. 



Locality, Pondicherry. 



