Prof. E. Forbes on Fossil Invertebrata from Southern India. 125 



Genus Chemnitzia, D'Orbigny. 



1. Chemnitzia undosa. (Melanopsis undosa, G. B. Sowerby, MSS.) PI. XV. 

 fig. 11. 



C. testa turrita, anfractibus 9, convexiusculis, regulariter undulato-plicatis ; spiraliter tenue 

 striatis ; ultimo basi laevigato, apertur^ pyriformi. 



Length 3 inches. Greatest breadth (of body-whorl) 1 inch. 



Shell turreted ; whorls 9, slightly convex in the centre, depressed, as if by an 

 obsolete spiral groove, near the deep suture. They are crossed by strong ribs or 

 plications which are suddenly bent in the depressed portion of the whorls. The 

 surface of the shell is minutely striated spirally. When observed with a lens, the 

 interspaces of the striae are seen to be alternately narrower and broader, and to be 

 decussated by very fine striations of growth. There are fifteen plications on the 

 body- whorl. They become obsolete below the middle. The mouth is pyriform. 



Locality. This species occurs at Verdachellum and at TrinchinojDoly. The 

 forms are identical in both localities. 



Genus Cerithium, Adanson. 



1. Cerithium spharuliferum, sp. nov. PI. XIII. fig. 6. 



C. testa turrita, anfractibus planis, lineis spiralibus tuberculorum, alternis multo majoribus, 

 cinctis ; suturis impressis ; basi concentricfe sulcata. 



The fragment preserved of this very distinct species admits of measurement only 

 on the second whorl, which is ^^ths of an inch in length and i^ths in breadth. 

 This whorl is banded by three series of large bead-like tubercles, separated by as 

 many rows of minute ones. On the body-whorl the row of granules near the suture 

 is the only one much developed, the granules of the other rows being small. On 

 the base, the interspaces of the spiral grooves are not granulated. The sutures 

 separating the whorls are very distinctly marked, and rather wide and deep. 



Locality, Pondicherry. 



2. Cerithium scalarioideum, sp. nov. PI. XIII. fig. 7. 



C. testa turrita, anfractibus (7-8) planatis, longitudinaliter (16) costatis, costis nodulosis, 

 sulcis spiralibus decussantibus ; suturis profundis ; basi laevi, bicarinato, carinis crenulatis 

 distantibus ; apertura orbiculari, canali angusto. 



Entire length \^^ inch. Breadth of second whorl 0/j inch. Length of second whorl 

 O2 J inch. 



Shell turreted, gradually tapering, with seven or eight flattened whorls, which 



VOL. VII. SECOND SERIES. S 



