EXPLANATION OF THE PLATES AND WOOD-CUTS. 



Fig. 2. Cypris cylindrica. Twice as wide as long, almost cylindrical ; front very 



slightly concave ; the outer surface, which is very rarely obtained, is punctured. 

 Fig. 3. Cypris subglohosa. Subglobose, triangular, inflated ; front concave. 

 The outer surface of this Crustacean is punctured as in C. cylindrica. 

 Both species occur abundantly in grey chert, with the Unio Deccanensis and 

 other shells ; and in various specimens of chert and indurated clay containing Gy- 

 rogonites, Paludince, Physce, and Limnei, from the Sichel hills. The fossils are 

 converted into calcedony. 

 Fig. 4 to 10. Unio Deccanensis. Transversely oblong, rather compressed ; margin 

 internally waved ; shell very thick ; surface finely striated. Fig. 6 is in limestone 

 from the northern descent of the Sichel hills ; the others are in chert from 

 Munnoor. Natural size. 



This species has often a ridge, which bounds the posterior portion, and is vari- 

 able in size and elevation ; it is most conspicuous in the limestone specimen, fig- 6, 

 and in a cast in chert from Munnoor, fig. 7. Fig. 8 is possibly a very young indivi- 

 dual, before the margin had assumed its wavy form. Fig. 9 is from a part of 

 a group of many individuals of nearly one size, badly preserved in the same lime- 

 stone as fig. 6 ; but as they are regularly oval, and do not show a waved margin, 

 they may belong, as well as fig. 10, which is in grey chert from Munnoor, to a 

 species distinct from U. Deccanensis. Some flattened specimens from this lime- 

 stone are 2| inches broad. 

 Fig. 11 and 12. Unio tumida. Transversely obovate, smooth, gibbose ; posterior ex- 

 tremity rather pointed ; beaks near the anterior rounded extremity. Natural size. 

 The section of the two valves united is regularly heart-shaped. The shell is 

 rather thin, and it has something of the contour of Cyrena. It occurs in the 

 same limestone with fig. 6, and the substance of the shell is replaced by cal- 

 careous spar, which cannot be broken so as to show the hinge. 

 Fig. 13. Limnea subulata. Subulate, elongated, smooth; spine equal in length to the 

 body ; whorls five. In a nearly white, soft, siliceous stone, from Munnoor and 

 Chicknee. Natural size. 

 Fig. 14, 15 and 16. Physa Prinsepii*. Ovate, rather elongated, smooth, spire short ; 

 body-whorl largest upwards. Fig. 16, in a soft siliceous stone from Munnoor. 

 Fig. 14 in chert from Munnoor, and fig. 15 in chert from Chicknee ; the drawing re- 

 presents the shell as wider than it is. Many of the specimens are crushed. The 

 largest, fig. 15, are 2| inches long and upwards of an inch broad. Natural size. 

 Fig. 17 to 19. Melania quadri-lineata. Subulate, whorls about eight, with four striaj 

 upon each ; aperture nearly round. Fig. 17, in grey limestone from the same lo- 

 cality as 6 and 11. Fig. 18, in softish chert from Chicknee, associated with 

 Physa Prinsepii. Fig. 19, in fine reddish grey chert, protruding from basalt near 

 Munnoor, appears rather shorter in form than the others, but the spine is not 

 perfectly exposed nor entire. Natural size. 



* Mr. Sowerby has, with much propriety, named this fossil after Mr. James Prinsep, F.R.S., and Secre- 

 tary to the Asiatic Society of Bengal ; to whom Oriental science and literature are more indebted than to 

 any other individual. — J. G. M. 



