4 1 6 Bulletin Atnerican Museum of Natural History. [Vol. XIX, 



nor have I found any statement that they are lodged in 

 sockets. If they are not in sockets, this will furnish another 

 character to distinguish the species from Ichthyodectes. 



In the collection there are several portions of this fish, but 

 no complete specimen. None of these furnish the teeth. One 

 example, No. 4506a (3681), shows the fish from apparently 

 just behind the pectoral girdle to the base of the caudal fin. 

 This length is 400 mm. In this distance there are about 54 

 vertebra, but these have been disturbed anteriorly. The 

 depth at the origin of the anal fin is 120 mm. The anal fin 

 begins 186 mm. in front of the base of the caudal. There are 

 apparently about 8 strong rays in front; behind these the 

 rays are weak and, in the fossil, form an obscure fringe along 

 the body. There are altogether 34 interhaemal fin supports. 

 The whole length of the anal base is 137 mm. 



So far as indicated by the specimen, the dorsal fin begins 

 no mm. in front of the base of the caudal fin and opposite 

 the beginning of the hinder third of the anal. Only 10 rays 

 can be counted, but there may have been others posteriorly. 

 Large intemeurals are present in front of the fin, but there 

 seem to have been no rays attached to them. The neural and 

 haemal spines are long, slender, and sigmoid in form. The 

 vertebras both of the abdominal and caudal regions are some- 

 what higher than long, about 7 mm. long and 9 mm. high. 

 The side of the centrum is excavated by a pair .of rather deep 

 pits or grooves. Where the centra happen to be split longi- 

 tudinally they show that the notochordal perforation is a 

 millimeter or more in diameter. 



About 95 mm. in front of the dorsal fin, and therefore not 

 far behind the head, there is, on the back, a rounded mass of 

 bone. This seems to be connected with the distal ends of 

 some rather stout intemeurals. This mass is about 27 mm. 

 long, 10 mm. high, and 5 mm. thick from side to side. 



Most of the scales are removed from the fossil. They 

 appear to have been about 15 mm. high, and their exposed 

 portion about 8 mm. fore and aft. 



Another specimen, from Hajula, No. 45066 (3646), con- 

 firms the above description, except that it does not include 



