140 PROCEEDINGS OF THE NATIONAL MUSEUM. vol. 51. 



B'. Dorsal fin single, low throughout its extent; head exceedingly massive 

 and soft; teeth in bands, on jaws only; scales spinigerous; mouth 

 entirely inferior, below or behind eye; ventral fins greatly reduced or 



absent Mackouroidinae. 



d\ Ventrals small, with 5 rays ; pectoral with 25 rays ; gill-rakers 

 long; gill-membranes free from the isthmus; mouth behind 



eye; pseudobranchial filaments present Squalogadus. 



d\ Ventrals absent ; pectoral with 16 rays ; gill-rakers short ; gill- 

 membranes joined to the isthmus ; mouth below eye ; pseudo- 

 branchial filaments absent Macrouroidcs. 



A-. A fold of membrane attached to first gill-arch, and restricting the first 

 gill-slit; gill-rakers tubercular; no pseudobranchiae ; second dorsal ray a 

 modified spine, often with serrations on its anterior edge; anal better 

 developed than second dorsal ; teeth in jaws only. 

 Z)\ Pectoral fin not pedunculated ; pectoral actinosts 4 to 6. 



CORYPHAENOIDINAE. 



e\ Six branchiostegal rays; anus immediately before anal fin 

 (except in Coryi^haenoUes hyostonins, Abyssicola macro- 

 chir, and some aberrant species of Coelorhynchvs) ; anus not 

 preceded by a naked area or fossa, except in Abyssicola and 

 certain species of Coelorhynchus; no striated regions on 

 under side of trunk; scales usually of moderate size (en- 

 larged in some species of Coelorhynchus) ; gill-rakers fewer 

 than 15 on lower limb of second arch; gill-membranes 

 broadly united, scarcely extended forward ventrally ; species 

 large and widely distributed, usually reaching a length of 

 over two feet. 

 f. No barbel ; anal not much higher than second dorsal ; dorsal 

 spine slender and smooth ; premaxillary teeth unequal, in 

 a narrow band separated by an interspace from the mar- 

 ginal series of small teeth, one of which is enlarged to 

 form a large anterolateral canine; physiognomy as in 



Bathygadus, the mouth terminal Cynomacrurus. 



f. Barbel always present; anal much higher than dorsal; no 



specialized pair of anterolateral canines; mouth never 



completely terminal. 



g^. Snout little produced ; no strongly marked ridges on 



head, the suborbital ridge not extending to preopercle ; 



dorsal spine trenchant on anterior edge and serrate 



(serrations rarely obsolescent). 



7/\ Outer series of premaxillary teeth enlarged, one or two 



inner series ; inner mandibular series enlarged, one 



outer series in some species ; i)hysiognomy usually 



approaching that of Bathygadus Nematomirus. 



h' . Teeth in a villiform or cardiform band in upper jaw, 

 varying from a single series to a band in the lower 



jaw Coryphaenoides. 



g^. Snout usually greatly produced ; head with prominent 



ridges, armed with modified scales, the suborbital ridge 



extending to preopercle; dorsal spine smooth and 



rounded anteriorly. 



i\ Teeth in bands in jaws; ridges of head strong; the 



side of head strongly angulated at the suborbital 



ridge Coelorhynchus. 



