DISCUSSION OF SPECIES AND THEIK DISTRIBUTION. 381 



VeutraLs compo.sed of .st-veral rays, slightly iu advance of the pectorals, whicli are narrow. 

 Bones flexible; mucous cavities of the head of moderate capacity. I'seudobrauchia- uoue. 

 [Giinthcr.) 



ONOS, Risso. 



Onos, Risso, Hist. Nat. Eur. M^rid., 1826, m, 214 (type, G. musicUa L.).— Gill, Proc. Acad. Nat. Sci. Pbila., 

 1863,- 240.— Jordan & Gilbert, Bull., xvi, U. S. Nat. Mus., TftG.— Collett, Vid. Selnk. Forliaudl.,' 

 Chrlstiania, 1891, No. 11. 



Motella, CuviER, Regue Animal, id. 2, ii, 182;», ;!34.— (JCXTiiEii, Cat. Fi.sh. Brit. Mus., iv, 364. 



Molvella OMd Motella, Kait, Wiegm. Archiv.. 18."i!t, ilO. 



Gadoids with body rather elongate, covered with minute scales; head not compressed; 

 upper jaw longer; snout with 2 barbels and chin with 1; teeth on Jaws and vomer in 

 bands; palatines toothless; dorsal tins 2, the anterior composed of small fringe-like rays 

 concealed in a groove, preceded by a single hmg ray; second dorsal and anal long and 

 similar; caudal rounded or lanceolate; tail isocercal; ventral lius with fiom 5 to 7 rays; 

 chin with a barbel. 



KEY TO THE SI'ECIES OF ONOtS. 



[From CoUett.) • 



I. First ray of first dorsal short (equal to or slightly longer than .suout). 



A. Pector.al rays about 14 [O. pacificus] 



1. Pectoral rays about 17. 



a. Longitudinal diameter of eyes equal to or letss than width of iuterovbital space. 



• Height of body 7^ in tot.al length, v. (!. O. MEDlTElutANEis 



• 'Height of body 6J iu total length, v. 7 O. guttatcs 



b. Longitudinal diameter of eyes greater than width of iuterorbital sjiaee. 



• Head large, its k'ugtb aluiut 4j iu total [••• MACROPTiiALMti.'^] 



•"■Heacl small, its length about .5i in total O. uiscayexsis 



2. Pectoral rays 22 or more. 



a. Longitudinal diameter of eye ei|ual to or less than iuterorbital spac'e. 



First ray of first dorsal eiiual to diameter of eye O. vclgaki.s 



First ray of first dorsal greater than diameter of eye (). keiniiardtii 



/>. Longitudinal diameter of e.ye great, larger than iuterorbital .space O. carpenterii 



II. First ray of first dorsal long (equal to head), color uniform salmon or brick red O. EN.sis. 



ONOS ENSIS, (Reiniiari)t), Gill. (Figure 327.) 



Moiellaensis, Reinhardt, Kon. Ved. Selsk. Math. Natura, Copenhagen, vi, 1837; ex. vii, 1838; 116, 128.— CoL- 

 LETT, Forh. Vid. Selsk. Christiania, 1878, No. 17; Xorske Nordhavs Exp., 1890, Fish, 134.— LI'TKE.v, Vid. 

 Medd. Naturh. Foren. Copenhagen, 1881, 236. 



Onos ctisis, Gill, Proc. Acad. Nat. Sci., Phila. 1863, 241.— Jorhan and Gilbert, 15u1I. xvi, U. S. Nat. Mus- 

 797._GuNTnER, Challenger Report, xxil, 98.— Collett, Forh. Vid. Selsk, 1891, No. U. 



Onos rtifns, Gill, Proc. U. S. Nat. Jlus., vi, 1883, 259.— Jordan, Cat. Fish. N. A., 128. 



Head small, its length n^ii in total. E.ve small, its diameter one-half the length of 

 the snout. Vent nearly meditiu. First dorsal rays prolonged, as long as head. Teeth iu 

 villiforni bands, small and uniform. 



Eadial formula: D. 59; A. 44-40; P. 22-27; Y. 8. 



This form is known from (heenlaud, whence the museum at Copenhagen obtained 2 

 specimens, taken iu 183G from the stomach of a seal (Ci/stoplturn) at Omenak (hit. 70^ N). 

 Another was found in 1882 by the U. S. Fi.sh Commission steamer Fi)ih Hawk in hit. 40^, oil' 

 the coast of i^"ew Jersey, in 1,100 fathoms. 



The body is uuustxaily high, the greatest height at anus contained 4.} times in length ex- 

 clusive of caudal. The head enters 5.J times in the lenglh to end of caudal peduncle and 

 G times iu total length; its width at cheeks equals two-thirds of the head's length. 



The eyes are rather large, neaily as long as snout and the iuterorbital area, and are 

 entirely in the anterior half of head, the i)osterior margin of the orbit nearly eiiuidistant 

 between the tip of the snout and the postei ior margin of the operculum. The mouth is 



