Prof. E. Forbes on Fossil Invertebrata from Southern India. 137 



3. Natica suturalis, G. Sowerby, MSS. PI. XV. fig. 1. 



N. testa subglobosa, spira brevi^ obtusa ; anfractibus 5 lasvigatis, supernfe subangulatis, 

 prope suturam canaliculatis ; ad suturam marginatis ; umbilico angusto. 

 Length 0/^ inch. Breadth Oj% inch. 



Shell globose, smooth, in very young specimens spirally striated. The whorls 

 are depressed near the suture and channeled. The canal is traversed by regular 

 lines of growth, and is separated from the suture by a raised margin. The spire 

 is obtuse. The mouth is rather wide. The pillar-lip is grooved by a deep and 

 defined but narrow umbilicus, which is bounded externally by a shallow groove. 



Locality, Trinchinopoly. 



4. Natica? rugosissima, sp. nov. PL XIV, fig. 7. 



N. testa subglobosa, spira parv&, depressa, anfractibus 4 transversa rugosis, sulcis profundis 

 irregularibusque ornatis ; umbilico ? 

 Breadth O/g inch. Height Oy\inch. 



A remarkable shell, easily distinguished by its very low spire and the deep sul- 

 cations or rather plications which ornament the whorls. 

 Locality, Verdachellum. 



Genus Calyptr^a, Lamarck. 



1. Calyptraa? elevata, sp. nov. PI. XII. fig. 10, a, h. 



C. testa conica, laevi, expansa, apice obtuso, centrali. 

 Breadth ly^^ inch. Height Oy'g inch. 



A large and very convex yet very broad shell ; it appears to have been smooth 

 or very slightly undulated concentrically. The apex is obtuse and central. Though 

 the internal structure of this shell is unknown, there can be little doubt of the 

 propriety of referring it to the genus Calyptraa. 



Locality, Pondicherry. 



2. Calyptraa? corrugata, sp. nov. PI. XII. fig. 11, a,b. 



C. testa valde conica, inflata, concentrice corrugata, longitudinaliter obsolete striata, apice 

 excentrico, contorto. 



Breadth 0/^ inch. Height 0-/^ inch. 



Shell very tumid, regularly wrinkled concentrically, and somewhat obscurely 

 marked with longitudinal striae. The apex is very much out of the centre and 

 turned down, though rather obtuse. I place this shell provisionally in Calyptraa, 

 but it may prove to be a form of Pileopsis, or some aUieS shell. It is next to im- 



