Jordan and Everinann. — Fishes of North America. 531 



reunited with the Isofipondyli or otlierwise distributed when the osteol- 

 ogy of the different fiiniilies is known. In but few genera has the 

 niesocoracoid or the post-temporal received examination. (Iviov, nape; 

 ihuor, shoulder.) 



Giinther divides the Iniomi into two families, Stomiaiidw and Sternopty- 

 chidd', according to the relation of the nuixillary to the border of the 

 mouth. Goode and liean follow Gill in separating the group into many 

 families. Liitkeu, who has made most valuable studies among the deep- 

 sea forms, seems inclined to recognize several families. He regards it as 

 necessary either freely to subdivide the group or else to regard the whole 

 as a single family. The composition of the group and the varied relations 

 of its parts are best seen by regarding its principal types as of family 

 value. We begin the series with the family which contains most shore 

 species, and which is apparently nearest the InospundijU, from which group 

 the Iniomi have apparently been modified or degraded. 



Families* of INIOMI. 



a. Post-temporal connected with back of cranium near sides; no pliotopliores or barbel. 



b. Adipose fin typically present (rarely atrophied ur lost); body not very elongate; anal 

 fin distinct. 

 c. Scales present, usually persistent; teeth cardiform or villiform, usually movable. 

 d. Maxillary very narrow, rudimentary, or obsolete; hypocoracoids not divergent; 

 pseudobrancbia^ present. SyNODONTiDiE, lxviii. 



dd. Maxillary well developed, dilated behind. 



e. Peeudobranchia; present; jjectorals normal; hypocoracoids mostly diver- 

 gent, undivided. Aulopid.*;, lxix. 

 ee. Pseudobranchiai absent; pectorals not normal. 



/. Pectorals subhumeral. Benthos.wrid.i;, lxx. 



ff. Pectoral rays elongate, arranged in two groups. 



Bathtpteroid.k, lxxi. 

 fct. Adipose fin alisent. 



g. Body covered with scales which are large, thin, and deciduous; teeth villiform, in 

 bands; no photopliores on the scales, but a large, luminous plate on the head 

 in place of eyes; maxillary dilated behind; pectorals and ventrals well devel- 

 oped, approximate. Ipxopid.t;, lxxii. 

 gg. Body scaleless; teeth granular, in bands; pectorals normal. 



/(. Ventrals present; opercular apparatus incomplete. Kondeletiid.b, Lxxiii. 

 hh. A'entrals absent; opercular apparatus complete; a conspicuous lateral furrow; 

 general form and appearance of young cetaceans. Cetomimidji;, lxxiv. 

 aa. Post-temporal impinging upon occiput. 



i. Vertebne and neural spines normal, not projecting from the flesh in front of the dorsal 

 fin. 

 J. Photofihores present. 

 A-. Barbel wanting. 



I. Pseudobranchi.i> present. 



in. Preuiaxillaries forming entire margin of upper jaw; body scaly; 



opercles complete. Mvctoimiid.k, i.xxv. 



mm. Premaxillaries not forming the whole margin of upper jaw, the 



maxillary entering into it; body naked; opercular apparatus 



incomplete. Mairolicid.t;, i.xxvi. 



n. Pseudobranchiiv absent; mouth large, with canine teeth; scales deciduous 



or wanting. CiiAULiODONTiDa:, lxxvii. 



kk. Barbel present, very long. 



* The analysis of the families of Iniomi is chiefly taken from Goode & Bean, Oceanic 

 Ichthyology. 



