136 Prof, E. Forbes on Fossil Invertebrata from Southern India. 



Genus Ringicula, Deshayes. 

 1. Ringicula? acuta, sp. nov. PI. XV. fig. 2. 



R. testa oblonga, laevi, spira prominenti, acuta, anfractibus 5, superioribus planatis, ultimo 

 inferne tumido, labio externo incrassato. 



Length 0/^ inch. Breadth rather more than Oj^ inch. 



A little smooth shell, with a conical and acute spire, the whorls of which are 

 separated by a rather deep suture. The body-whorl is rather flattened at the 

 upper part, tumid below, and is obscurely marked by lines of growth. The outer 

 lip is thickened. The mouth is concealed by rock, but the general aspect of the 

 shell is that of a Ringicula. 



Locality, Trinchinopoly. 



Genus Natica, Lamarck. 



1. Natica pagoda, sp. nov. PI. XIL fig. 14. 



N. testa elongato-conic^, vix umbilicat^, laevigata, striis longitudinalibus minutis, spira 

 turrita, anfractibus 6, ad suturam planatis sulcatisque, superioribus convexiusculis, ultimo 

 rotundatOj apertura ovato-lanceolata. 



Length 1| inch. Breadth 0^^ inch. Spire Oy\ inch. 



This species has a very large and rounded body-whorl ; and a much-produced, 

 turreted acute spire. The whorls are deeply channeled, though narrowly, along 

 the line of suture, and are flattened or slightly angled for some distance beyond. 

 The surface is to the eye smooth, but when examined with a lens shows minute and 

 regular striae of growth. The umbilicus is either very small or almost obsolete. 



It is nearly allied to the lower greensand Natica rotundata, but is much more 

 produced in the spire. 



Locality, Pondicherry. 



2. Natica obliquistriata, sp. nov. PI. XIL fig. 12. 



N. test^ subglobosa, subumbilicata, anfractibus convexis, sub lente oblique striatis, supra 

 planis, suturis excavatis, decussato-striatis, apertura oblonga. 

 Length 1 inch. Breadth 0^^ inch. 



Smooth and polished at first glance, but on closer observation seen to be 

 marked with tine oblique undulating striae. On the summits of the whorls at the 

 line of suture there is a broad shallow impression which is striated by four or five 

 deep spiral striae, decussated by lines of growth. The shell is thick. The cast is 

 smooth. 



Locality, Pondicherry. 



