ON FOSSIL FISH-TEETH. 305 



of the upper teeth, being almost perfectly flat on the surface, with ill 

 d&veloped ridges and furrows. The first or anterior horn of this is, on 

 surface, slightly convex, corresponding with the slight concavity or 

 depression in the analogous surface of the upper tooth, as mentioned 

 above. The second and third ridges are nearly alike, and are mora 

 sliglitly marked than the first. The fourth is still more prominent 

 and larger, and the ridge of its continuation makes a well marked rise 

 on the general surface of the tooth. The fifth or last spur is broken 

 off in our specimen, but it mast have been less prominent, and marked 

 than the fourth. To this specimen. PI. xv. Figs. 5, and 6, no bony layer 

 is attached ; the under side, as Well as the upper, is closely punctulated, 

 and also marked by numerous strongly cut curved fossettes, giving the 

 whole a very worm-eaten aspect. 



The two teeth are shewn in contact PI. xv. Fig. 3. 

 Among the varieties figured by Agassiz, C. Kanpii appears to be the 

 most nearly related to this. It is, however, very distinct. It is not by 

 any means so elevated or thick a tooth, the ridge bounding it, is not so 

 continuous, and the general form of its outline appears to have been 

 more irregulai'. 



The species is named after the Revd. Robert Hunter, for many years 

 the active fellow labourer of Mr. Hislop in his researches in Nagpur. 

 Found with the last. 



Ceeatodus Vikapa. n. s. 



PL siv. Figs. 8, 9, 10, 11, 12.— PI. xvi. Fig. 2. 

 In general outline and form, this much resembles the last described 

 species, but at the same time offers very marked distinctions. The 

 tooth is broader, and more massive, as compared with its length ; the 

 upper face exhibits a much larger proportion of flat surface ; the ridge 

 and furrows are less sharp and defined, but more rounded and open. The 

 anterior inner edge of the tooth (upper jaw) is straight or nearly straight 



H 



