30 CATALOG OF FOSSIL FISHES IN THE MUSEUM 



A species of about the size of Coccosteus decipiens, with plates orna- 

 mented with small, closely-crowded, stellate tubercles. Distin- 

 guished from other species by the form of the plates mentioned above. 

 Postero-ventromedian lozenge-shaped, with broad lateral flanges for 

 overlap by the other ventral plates; length, 15 mm., width, 11. 

 Some of the tubercles of this plate, as seen in a wax squeeze, are 

 clearly stellate. Median occipital distinguished from that of other 

 species by the fact that its lateral margins do not converge rapidly 

 anteriorly; i.e., the plate, exclusive of the postero-lateral comua, is 

 more nearly rectangular than in other species, for example in C. 

 decipiens, in which it is triangular with the apex of the triangle cut off. 



Remarks. — This is one of the smallest American species of Coccos- 

 teus known. It recalls C. macromus Cope, from the Chemung, but 

 this species was based on one or two plates almost too fragmentary for 

 identification as Coccosteus. 



The following specimen apparently also belongs to this species. 



E 2597 Impression of a cranial shield, of which nearly the entire 

 outline can be made out (PI. 70, fig. i). A few of the 

 sensory canals are also discernible. From the strong 

 posterior excavation of the median occipital, which re- 

 sembles that of the cotype (PI. 4, fig. 3) ; from its size, 

 and geological horizon, it apparently belongs to this 

 species. The head is rather more elongated antero- 

 posteriorly than is usual in Coccosteus. 



Measurtments mm. 



Total length 82 



Length, tip of rostrum to middle of posterior margin of 



med. occipital 70 



Width at middle of orbits 40 



Greatest width, posteriorly 80 



Coccosteus, sp. 



In addition to the preceding specimens there are a number of more 

 or less fragmentary coccosteid remains in the Buffalo museum. Those 

 from the Rhinestreet shale, listed below, perhaps belong to C. 

 parvulus, but there is no proof of this at the present time. 



a. Specimens from the Conodont bed, at Eighteen Mile Creek, 

 near North Evans, N. Y.; collected by W. L. Bryant. 



