Prof. E. Forbes on Fossil Invertebrata from Southern India. 117 



which are in other respects similar to those of the first-described species. The 

 sutures of the chambers are very similar, but the saddles are much more unequal 

 and the lobes more deeply divided. It terminates like the next species in a loose 

 oblique spiral of several whorls. 

 Locality, Pondicherry. 



4. Hamites large-sulcatus, sp, nov. PJ. XL fig. 1. 



H. testa elongata, rotundata, transversim crebricostata, costis continuis, prominentibus, sub- 

 obliquis, simplicibus, regularibus, distantibus, acutis (in nucleo obtusiusculis). 



The surface of this Hamite is barred by very regular sharp ribs, which in some 

 specimens are arranged more or less obliquely. The sulcations between the ribs 

 are quite smooth and rounded. The section of the shell is round, or very slightly 

 compressed. Most of the fragments are straight, but a few are segments of a 

 considerable curve, which shows that the termination posteriorly was spiral. The 

 largest and most curved specimen bears two oral varices. The sutures are seen 

 on some small fragments ; they are composed of six lobes and six saddles, both 

 lobes and saddles bifurcated, and not very deeply pinnate. The superior lateral 

 lobe is larger than the dorsal. 



There are specimens in the collection of various sizes ; the largest measures 

 2^% inches in circumference. 



This species appears to be common at Pondicherry. 



5. Hamites rugatus, sp. nov. PI. XL fig. 2. 



H. testa elongata, subcompressa, transversim crebricostata, costis continuis, prominentibus, 

 subobliquis, simplicibus, regularibus, obtusiusculis (in nucleo rotundatis). 



Diameter of largest specimen 5j^^ inches. 



This species, which grows to a great size, is encircled by very numerous, promi- 

 nent and closely-placed ribs. The posterior extremity becomes suddenly spiral, so 

 as to form, when young, a species of the genus Helicoceras of M. D'Orbigny. The 

 spire is of three oblique turns, placed quite apart from each other. The partitions 

 of the chambers are very complicated, the lobes and saddles being narrow and 

 much pinnated. They are doubly bifurcated and even. 



Locality, Pondicherry. 



6. Hamites nereis, sp. nov. PI. X. fig. 7. 



H. testa elongata, arcuata, compressa, transverse costata, costis frequentibus, interstitiis an- 

 gustioribus, in dorso subinterruptis ; dorso canaliculato, 



Circiunference of largest specimen 0^^^ of an inch. 



Shell compressed, especially at the back, which is channeled so as to interrupt 



VOL. VII. SECOND SERIES. R 



