2532 Bulletin //, United States National Museum. 



d. Subopercle and postclavicle normal, both thin and flat, not enlarged 



and ivory -like. POLLACHIUS, 977. 



dd. Subopercle and postclavicle enlarged, the bone dense and smooth, 



like ivory. THERAGRA, 978. 



66. Lower jaw included; barbel well developed ; caudal not concave behind. 



e. Hypocoracoid not swollen and ivory-like ; lateral line pale; supraoccipital 



crest moderate. 



/. Transverse processes of vertebrae thickened, swollen, and ivory-like 

 at tip ; small codfishes of the Arctic. ELEGINUS, 979. 



/. Transverse processes of vertebrae not swollen at tip. 

 g. Vent in front of second dorsal; size very small. 



MICROGADUS, 980. 

 gg. Vent below second dorsal ; typical codfishes of large size. 



GADUS, 981. 



ee. Hypocoracoid much swollen and ivory-like; lateral line black; mouth 



small, the maxillary not reaching to opposite eye; supraoccipital crest 



very high. MELANOGRAMMUS, 982. 



aa. Anal fin forming a continuous fin or sometimes deeply notched ; dorsal not divided 



into 3 fins. 

 h. Dorsal fin divided into 2 fins. 



t. Anterior dorsal composed of distinct rays, similar to those in second 



dorsal. 

 j. Ventral fins rather broad, each of about 6 rays. 



Ic. Anal fin with a deep notch. 



I. Snout not much depressed, its edge without keel ; tail slender. 



LEPIDION, 983. 



II. Snout flat, depressed, keeled on the edge; tail attenuate. 



ANTIMORA, 984. 



kk. Anal fin not notched ; mouth terminal. 

 in. Vomer toothless. 



n. Teeth in jaws unequal, outer series enlarged. 



o. Barbel obsolete. UEALEPTUS, 985. 



oo. Barbel well developed. LOTELLA, 986. 



nn. Teeth in jaws all villiform ; barbel developed. 



PHYSICULUS, 987. 

 mm. Vomer with teeth ; head not compressed. 



p. Vomer and mandible without canines. Fresh-water 



species. LOTA, 988. 



pp. Vomer and mandible armed with canines. Deep- 



water species. MOLVA, 989. 



jj. Ventral rays very slender, each of 1 or 2 rays. 



q. Ventrals each of 2 or 3 slender rays. UROPHYCIS, 990. 



qq. Ventrals each of a single bifid ray. L^MONEMA, 991. 



GAIDROPSARIN.S: : 



ii. Anterior dorsal formed of a single slender ray, followed by a band of 

 fringes ; ventrals each of 5 to 7 rays. 



r. Barbels 3; snout with 2 barbels, 1 at each nostril, none at tip; chin 



with 1 barbel. GAIDROPSARUS. 992. 



rr. Barbels 4; snout with 3 barbels, 1 at tip of snout and 1 on each 



nostril ; chin with 1 barbel, head high and compressed ; no canines. 



ENCHELYOPUS, 993. 

 BROSMIKLE : 



hh. Dorsal fin continuous, undivided; ventrals several-rayed; teeth on jaws, 

 vomer, and palatines ; mouth large ; frontal bone. BROSME, 994. 



