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. Thekagea, 978. 



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



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

 crest moderate. 

 f. Transverse processes of vertebra? thickened, swollen, and ivory-like 

 at tip ; small codfishes of the Arctic. Elegin'US, 979. 



ff. Transverse processes of vertebra? not swollen at tip. 

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



MlCEOGADUS, 980. 

 (/(/. 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. Melanogrammds, 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. 



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

 dorsal. 

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



MoRIN.li : 



k. Anal fin with a deep' notch. 



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



Lepidion, 983. 

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



Antimora, 984. 

 LOTIN^ : 



kk. Anal fin not notched ; mouth terminal. 

 m. Vomer toothless. 



n. Teeth in jaws unequal, outer series enlarged. 



0. Barbel obsolete. ITEALEPxrs, 985. 



00. Barbel well developed. Lotella, 986. 



nn. Teeth in jaws all villiform; barbel developed. 



Physiculus, 987. 

 m7». 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. 



PHTCIN.E : 



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



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



i]q. Ventrals each of a single bifid ray. Ljemonema, 991. 



Gaideopsaein^: : 

 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. Gaideopsarus, 992. 



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



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



ENCHELYOPUS, 993. 

 Beosmin^ : 

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

 vomer, and i)alatines ; mouth large ; frontal bone. Brosme, 994. 



