284 TRANSACTIONS OF THE [mAR. 15, 



The present paper includes descriptions of new species of 

 palaeozoic fishes, together with critical notes upon several gen- 

 era. These ma}^ be summarized as follows : 



Cladodus splendens^ n. s. 



" mortifer, n. s. 

 Oracanthus vetustus, Leidy, discussion of. 



" pugniuncuhts, St. J. & W., discusslou of. 



" lineatus, n. s. 



Ctenacanthus gurJeyi, n. s. (Not figured.) 



" depressus, n. s. 



Stethacanihus productiis, n. s. 

 " compressus, n. s. 



Asteroptychius gracilis, n. s. (Not figured.) 

 Dactylodus j))inceps, N. & W., discussion of. 



" lattis, n. s. 



" rectus, n. s. 



Deltodus grandis, N. & W., discussion of. 



" inornafus, n. s. 



" complanafus, N. & W., discussion of. 



" spatulatns, N. & W. 

 Sandalodus ellipticus, n. s. 

 Psepliodus {Helodus) politus, n. s. 

 Helodus coxanus, n. s. 

 Ctenodus fleisheri, n. s. 



" angustus, u. s. 

 Stenognaihus corrugatus, n. g. ( =^ Dinichthys cornigatiis, N.) 



Cladodus splendens, Newb. 

 PI. XXII., fig. 1. 



Teeth of moderate or large size, robust, average specimen one 

 and a half inches broad at base, one and a ^luarter inches high, 

 central cone robust, ancipital, anterior surface highly polished, 

 and splendent, lateral cones two on each side of nearly' equal 

 size, like the central cone tumid and highly polished, posterior 

 surface of central and lateral cones faintly striated. 



This splendid tooth has a marked resemblance to those of G. 

 elegans of the St. Louis limestone and I should not hesitate to 

 consider them identical, if it were not that in G. elegans the entire 

 front and rear surfaces of the central and lateral cones are covered 

 with strongly marked raised lines. In fact no other species with 

 which I am familiar is more strongly striated ; whereas in C 

 splendens the whole surface is smooth and brilliantly polished. 

 The form of the teeth in the two species is, however, ver}' similar, 

 the lateral cones of C. elegans, Wo on each side, are relatively 

 large and nearl}^ equal as in G. splendens, but in the former 

 species they are more divergent, less compressed and are strongly 

 striated, while in C. splendens the}- are nearl}^ erect and the sur- 

 faces are smooth and brilliantly polished. 



