ACTINOPTERI. 157 



Family ENCHODONTID^. 



Snout not produced. Teeth fused with supporting bone, not 

 in complete sockets, those on pterygopalatine arcade and dentary 

 largest. Supraoccipital not prominent, but extending forwards 

 to frontals and separating small parietals in median line. Squa- 

 mosal reduced, only partly covering otic region, which projects 

 laterally. Xo basicranial canal. Cheek-plates well developed. 

 Mandibular suspensorium vertical or inclined backwards, and 

 mouth gape wide. Premaxilla delicate, considerably extended, 

 and excluding great part of slender maxilla from upper mouth 

 border. Opercular apparatus complete, with few slender branch- 

 iostegal rays and no gular plate. Vertebral centra well ossified, 

 none with transverse processes. Ribs not completely encircling 

 adominal cavity. Compound hypural bone at tail base. Inter- 

 muscular bones present. Scales delicate or absent, but occa- 

 sional longitudinal series of scutes and dorsal series, when pres- 

 ent, unpaired. Fin fulcra absent. Rayed dorsal never extended 

 much, usually near middle of back, and sometimes an adipose fin 

 behind. 



Related to the existing BvermanellidcB and Alepisauridce, both 

 fishes of the deep sea. All the members of this family are ex- 

 tinct and comprise about 10 genera. 



Genus ENCHODUS Agassiz. 



Enchodus Agassiz, Poiss. Foss., V, 1843, p. 64. Type Bnchodus halcyon 

 Agassiz, first species, restricted by Woodward, Cat. Foss. Fishes, IV, 

 1901, p. 191. 



Isodus Heckel, Russegger. Reis., Ill, 1846-49, p. 342. Type Isodus sulcatus 

 Heckel, monotypic. 



Ischyrocephalus Marck, Zeitsch. Deutsch. Geol. Ges., X, 1858, p. 248. Type 

 Ischyrocephalus gracilis Marck, monotypic. 



Solenodon Kramberger, Jahrb. Geol. Reichsanst., XXXI, 1881, p. 373. Type 

 Solenodon neocomiensis Kramberger, first species, restricted by Wood- 

 ward, 1. c, p. 204. (Preoccupied by Brandt 1833.) 



Holcodon Kramberger, Rad. Jugoslav. Akad., LXXII, 1885, p. 19. Type 

 Saurocephalus? lycodon Kner, virtually monotypic. 



Euryganthus Davis, Tr. Roy. Dublin Soc, (2) III, 1887, p. 601. Type Eury- 

 ganthus ferox Davis, monotypic. 



