Stewart.] Cretaceous Fishes. 341 



tract us was intended to be expressed, as the author says :" " The 

 characters of the genus Anogmius Cope having up to the present 

 time rested upon but one species (A. aratas). it is satisfactory 

 to be able to confirm them by the study of new material," etc. 



This genus is well characterized by the tooth bearing elements, 

 all of which seem to be covered with villiform teeth. The pre- 

 m axillae are triangular in outline and covered with a semiellip- 

 tical band of teeth below. The maxillae are elongated and 

 slightly concave on the lower border, which is covered with 

 several rows of small teeth. The jaws are bound directly to the 

 skull by means of a small condyle above, which presents a 

 roughened surface, probably for cartilage. The dentaries are 

 also covered with small teeth similar to those on the maxilla 1 

 and prem axillae, and are incurved and loosely united at the 

 symphysis. The angle is prominent, and the mouth as a whole 

 is quite oblique. 



The top of the skull is flat, and beautifully sculptured with 

 coarse stria 1 radiating from near the center of each of the prin- 

 cipal bones. The frontals are long, while the parietals are 

 rather small. The supraoccipital is depressed and invades the 

 top of the skull very little, if any. The orbital cavity is large 

 and the sclerotic ring very thin. In this region there are 

 numerous membranous bones which probably form a covering 

 for the top of the skull to a greater or less extent. The oper- 

 cular bones are thin and covered with coarse stria 1 . 



In one specimen of A. polymicrodus there are sevent} T -two ver- 

 tebrae exposed to view, and there are probably eight or ten 

 more hidden by the opercular bones just back of the skull, 

 making, in all, eighty vertebrae in the complete column. The 

 centra are all rather short and do not present the lateral grooves 

 found in the Saurodontida and Ichthyodectidae, but are striated 

 and somewhat resembling the vertebra' of the genus Pachyrhi- 

 zodus Agassiz in this respect, and it is probably for this reason 

 that Zittel gives Anogmius as a synonym of this genus. 1 "" Just 

 in front of the caudal fin the vertebrae are crowded together, 



99. 1. c. p. 17-. 

 100. Zittel's Hanribucli der Paleontologie, b. III. 



