36 Bulletin American Museum of Natural History. [Vol, XIX, 



considerably farther forward, possibly on the anterior block. 

 On the hindermost block again there are remains of 4 or 5 

 rays. If the latter represent a distinct fin the one in front 

 must have ended very abruptly. To the writer it appears 

 quite certain that there was a single dorsal fin and that this 

 extended from near the head to near the root of the tail. 

 This must have resembled considerably the fin of Coryphcsna 

 hipptiris (Jordan and Evermann, Fishes of North and Middle 

 Amer., pi. cxlix, fig. 402). 



Unfortunately, throughout most of its length only the bases 

 of the fin rays remain, so that we have little idea regarding 

 the height of the fin. On the second block there are re- 

 mains of about 9 rays and some of these were at least 75 mm. 

 high. 



As stated by Cope some portions of the anal fin are present 

 (a. r.). It was certainly short, but its exact length cannot 

 be ascertained. A part of the anterior ray is seen, and about 

 6 interhasmal supports {i. h.) may be counted; but weathering 

 has removed most of the bones. 



There are present the distal ends of about 5 rays of one 

 ventral fin {v. r.). Their tips have reached the front of the 

 anal. They are cross-segmented. 



One pectoral fin {pet.) is well preserved. It has lain in 

 the matrix with the distal end directed across the vertebral 

 column and with the convex anterior border directed up- 

 ward. It is represented, for the sake, of convenience, in a 

 different position in the figure, the figure of it being drawn 

 from the block split from the one bearing the body of the fish. 

 The fin is 220 mm. long and seems to have consisted of about 

 20 rays. 



Only the base of the caudal fin is present. The rays are 

 supported by a fan-shaped hypural bone. In front of this 

 are seen the crowded terminal vertebras. The fin rays appear 

 to have been slenderer and more numerous than in Pachy- 

 rhizodus. No evidences of cross segmentation appear. 



The ribs are long and slender, and they have apparently 

 been connected with the vertebral centra by means of dis- 

 tinct pieces of bone, parapophyses, as in Tarpon, Portheus, 



