126 Prof. E. Forbes on Fossil Invertebrata from Southern India. 



are crossed by sixteen longitudinal ribs, broken into tubercles by the decussation of 

 deep spiral furrows. The whorls are separated by a deep suture. The base bears 

 two crenulated or almost granulated spiral ridges ; the rest of its surface is smooth. 

 The mouth is rounded and the canal narrow. 



This species is aUied to Cerithium pustulosum of D'Orbigny, and Cerithium Du- 

 pineanum of the same author, both French species, the former from the Craie 

 chloritee, the latter from the Neocomien. 



3. Cerithium Trinchinopolitense, sp. nov. PI. XV. fig. 10. 



C.test^ brevij anfractibus 6 ventricosis, angustis, costatis, ultimo magno ; longitudinaliter 12- 

 costata, costis spiralibus 4-5 decussantibus ; basi convexa laevi ; cauda lata, brevi. 

 Length rather less than y^ths inch. Breadth 0^ inch. 



A small conical species with very tumid narrow whorls, crossed by strong longi- 

 tudinal ribs and decussated by spiral furrows. The base is convex and smooth, and 

 the mouth terminates in a broad and short canal. It is nearly allied to some lower 

 greensand forms. 



Locality, Trinchinopoly. 



Genus Triton, Lamarck. 



1. Triton? atavus, sp. nov. PI. XIII. fig. 14. 



T. testa elongate, fusiformi, anfractibus (6 an 8 ?) tumidis, ultimo (1) varicoso ; ore rotundato, 

 cauda angustata. 



Length 3 inches. Breadth of body-whorl 1| inch. Length of aperture without canal 1 inch. 



A single very imperfect specimen, the generic position of which is however 

 almost certain and very interesting, since the genus, so far as I am aware, has 

 not been observed in cretaceous rocks before. It resembles in form the common 

 Triton variegatus and its allies. The surface is so injured as to render its character 

 uncertain, but there are traces of spiral striae and also of nodulations in the upper 

 whorls. The varix is distinct. 



Locality, Pondicherry. 



Genus Murex, Linnaeus. 



1. Murex fluctuosus , sp. nov. PI. XIII. fig. 19. 



M. testa (brevi) inflate ; anfractibus convexis rotundatis, longitudinaliter costatis, spiraliter 

 sulcatisque ; costis prominentibus, distantibus, continuis ; sulcis spiralibus numerosis crenatis, 

 interstitiis elevatis crenatis. 



Length of remaining portion of body-whorl l/g inch. Breadth of body-whorl 1/^ inch. 

 Length of second whorl Oy^^ inch. 



