Stewart.] Cretaceous Fishes. 261 



striated and contracted medially. Including the genera Ernpo, 

 Si itodus™ and (?) Cimolichthys ; family, Stratodontida? . 



IV. Fishes with an elongated compressed body; palatines 

 usually provided with a single large tooth ; dentaries with an 

 internal row of large teeth, and usually an external fringe of 

 smaller ones. Including the genera Enchodus, Tetheodus(f); 

 family, Enchodontida . 



V. Fishes with skull depressed, beautifully sculptured, and 

 probably covered with bony plates. Maxilla 4 , premaxillse and 

 dentaries with many rows of minute teeth. Vertebra 1 striated 

 and contracted but little medially. Including one genus, 

 Anogmius; family, Osteoqlossidse . 



VI. Fishes with maxillae and dentaries provided with a 

 single row of cylindric subequal teeth, all of which are partially 

 enclosed in alveoli and partially anchylosed to the bone. 

 Bones of the skull without ornamentation. Vertebra* longi- 

 tudinally striated. Including the genera Pachyrhizodus and 

 Oricardinus; family, Salmonidse. 



VII. Fishes with the ethmoid bone prolonged into a rostrum 

 anteriorly. Teeth laterally compressed, lanciform in two series, 

 the largest of which are set in alveoli. Predental bones prob- 

 ably present bearing teeth. Including one genus. Protosphyra ria ; 

 family. Pachycormida ."'' 



VIII. Body covered with large cycloid scales. Abdomen 

 frequently compressed into a serrated edge. Dorsal fin elongate ; 

 caudal fin often deeply cleft. Including the American genera 

 LeptichthySj Sardinius, and Spaniodon; family, Clupeidse. 



IX. l>ody slender and covered with several rows of bony 

 >cutes. Teeth in a single series. Including the American 

 genera Dercetis (Leptotrachelus) , Trisenaspis, IcMhyotringa^ and 



ecodon ; family, Dereetidse. 



15. I>r. A. S. Woodward, of the British Museum, has -ince examined our specimen, and 

 thinks the lart^ size of the parietal-, their meeting medially and the general shape of the top 

 of the skull would indicate that Stratodua WB8 closely related to Dercetis. 



16. Vertebrate Palaeontology A. S. Woodward), p. 111. 



