1862.] DE KONINCK INDIAN FOSSILS. 9 



had not the long exposure to atmospheric agency slightly abraded the 

 surface of the specimen figured. By this deterioration the ribs have 

 been distinctly separated by very narrow and shallow furrows, which 

 one might imagine excavated by a graver, and of which the figure 

 indicates very well the shape and direction. They number sixteen 

 on each side, and are curved in the shape of a half-circle, in such a 

 manner that they join again by a very acute angle to the dorsal 

 furrow. One may conclude from this disposition that the buccal slit 

 must have been deep, and that the lower portion of the mouth has 

 been slightly scooped out by a very well marked sinus. There is no 

 umbilicus, and the shell is very thick. The height of the only known 

 specimen is 6 centimetres, its length 5|. The ribs are generally 

 4 millimetres long. 



22. Bellerophon orientalis, De Kon. PI. III. fig. 3. 



This species is much smaller and rather less globular than the next. 

 It is higher than wide ; its surface is ornamented with small, trans- 

 verse ribs of growth, produced by very fine and close striae, and form- 

 ing a tolerably acute angle with the dorsal band. This band termi- 

 nates in a very narrow and shallow furrow, by which B. oriental-is is 

 easily distinguishable from B. tenuifascia, a species with a promi- 

 nent band, to which it has in other characters the greatest analogy. 

 The only specimen I have examined is 15 millimetres long by 

 12 millimetres wide. 



23. Bellerophon Jonesiantts, De Kon. PI. III. fig. 2. 



This species is globular in form, and as high as wide. When 

 young, its surface is covered with small, transverse, imbricated ribs, 

 produced by the successive growth of the shell, as is easily observable 

 in the specimen represented by fig. 2 a, of which a portion of the last 

 coil of the spire and the callus of the aperture have been taken off. 

 The ribs, which on the last whorl are (in the adults) transformed 

 into large, but slightly marked wrinkles, form an open angle with the 

 dorsal keel, which projects very slightly, and is but 1 millimetre in 

 breadth. The several whorls completely overlap each other ; the 

 umbilicus is nearly obsolete ; the lip {peristome) is tolerably thick near 

 the umbilicus, and slightly reflected. The buccal callosity is very much 

 extended, and covers over nearly the last whorl of the shell. The 

 test is thick, and the dorsal slit narrow and deep. 



This species has a great analogy with B. hiulcus, from which it 

 differs by the much narrower form and the more considerable num- 

 ber of its ribs of growth, as well as by the slight width and the pro- 

 jection of its dorsal keel. 



Of eight specimens examined, the largest are 5 centimetres 

 high, and as much wide ; the opening of the mouth is about 2 centi- 

 metres high. From the coarse calcareous shale of the Productus- 

 limestone of Chederoo. 



24. Macrocheilus depilis, De Kon. PL VII. fig. 3. 

 Notwithstanding that I am acquainted with but an internal cast of 



