Jordan and Evermann. Fishes of North America. 2563 



Ti. Scales nearly smooth, with weak ridges which are not 



spinigerous. MOSELEYA, 999. 



hh. Scales rough, with strong ridges. NEMATONURUS, 1000. 



ff. Dorsal fins near together, the interspace less than hase of first ; scales 



rough. 



i. Dorsal spine weak, unarmed or very nearly so; pectorals moder- 

 ate. ALBATROSSIA, 1001. 

 ii. Dorsal spine very strongly serrate ; pectorals very long. 



BOGOSLOVIUS, 1002. 



ee. Upper jaw with a distinct villiform band behind the outer series of 

 enlarged teeth; dorsal spine serrate ; dorsal fins not widely separated. 



CHALINURA, 1003. 



dd. Teeth in villiform bands above and below, the outer scarcely enlarged and 

 not separated from the rest ; the lower band sometimes becoming a single 

 series laterally ; scales rough . 

 j. Mouth wide, with considerable lateral cleft. 



k. Dorsal spine finely barbed ; skull rather fi>m ; dorsals moderately 



separated. COKYPH^NOIDES, 1004. 



kk. Dorsal spine entirely smooth ; bones of skull very thin and papery ; 



dorsals well separated. HYMENOCEPHALUS, 1005. 



jj. Mouth inferior, small, with little lateral cleft ; a more or less distinct 



ridge across the suborbital region. 



I. Scales spinous, very rough. 



m. Scales distinct, regularly imbricated. 



n. Long dorsal spine serrate in front; mouth subinferior, 



below the short snout. MACROURUS, 1006. 



nn. Long dorsal spine smooth; mouth wholly inferior, below 



the long sturgeon-like snout. CCELORHYNCHUS, 1007. 



mm. Scales indistinct, scarcely imbricated; the whole body rough- 



villous ; dorsal spine smooth. TRACHONURUS, 1008. 



II. Scales all thin and smooth, dorsal fin slightly serrulate. 



LIONURUS, 1009. 



995. BATHYGADUS, Giinther. 



Bathygadiis, GiJNTHER, Ann. Mag. Nat. Hist. 1878, 23 (cottoides). 



Head large, fleshy, without prominent ridges, spiny armature or exter- 

 nal depressions; nape elevated, hump-like. Snout broad, obtuse, not 

 produced ; mouth terminal very large, with small villiform teeth or none ; 

 suborbital ridge very low, not joined to the angle of the preoperculum. 

 Maxillary entirely received within a groove under the prefrontal and sub- 

 orbital bones, its tips narrowed and blade-like ; premaxillaries protractile 

 downward, separated anteriorly, rib-shaped, compressed vertically, very 

 broad and without true teeth; provided posteriorly with a short flange, 

 which is received under the maxillary; mandible received within the 

 intermaxillary bones, without true teeth, but with minute asperities, sim- 

 ilar to those in the upper jaw; voiner and palatines toothless. Barbel 

 sometimes present. No pseudo branchiae. Gill rakers numerous, moder- 

 ate, lanceolate, with minute denticulations along their inner edge. 

 Branchiostegal membrane free from the isthmus, deeply cleft. Branchi- 

 ostegals 7, very stiff. Gill opening very wide; gills 3; anterior gill arch 

 free. Operculum with a blunt, spine-like prominence at its angle. Ven- 

 trals below the pectorals, many-rayed, the anterior rays produced ; dor- 

 sal consisting for the most part of branched rays, higher than the anal, the 



