120. GADID^E - ONOS. 797 



late; tail isocercal ; ventral fins of 5 to 7 rays. Small fishes of the 

 northern seas; the species differing considerably among themselves^ 

 (Onos, an ancient name of certain Gadoid fishes; from >/, an ass.) 



a. Barbels four; head anteriorly high and compressed ; 110 large canines. (Rhinone- 

 mus Gill.) 



1226. O. CBB3iforius (L.) Goode & Beau. Four-bearded Rockling. 

 Brownish, posterior part of dorsal and anal, and lower margin of cau- 



dal abruptly black ; inside of mouth black. Head oblong, compressed, 

 the snout high, its anterior profile blunt; mouth large, inferior; a barbel 

 at chin, one at end of snout, and one on each anterior nostril; maxillary 

 reaching much beyond eye; teeth in narrow bands, some of them con- 

 siderably enlarged; lateral line stitch-like, developed at intervals. 

 First (free) ray of dorsal as long as head; veutrals about half length 

 of head; caudal somewhat acute. Head 5; depth C. D. 50; A. 43; 

 V. 5. L. 113 inches. North Atlantic, on both coasts. 



((ladus cimbriifs Linmens, Syst. Nat.: Motella caudacnta Storer, Hist. Fish. Mass. 

 361: Motella cinibna Giiuther, iv, 367: Rhino nemus caudacuta Gill, Proc. Acad. Nat. 

 Sci. Phila. 1863, 241.) 



. Barbels three. (Onos.) 



1227. O. iNL'iaiEmrdti (Kroyer) Gill. 



Uniform reddish brown; cirri and tips of fins red. Head depressed, 

 but rather pointed anteriorly; snout rather short, with two barbels; 

 chin with one; teeth in villiform bauds, those of one series in each jaw 

 longer than the rest. First ray of first dorsal short, little longer than 

 snout. Yent near middle of length. Distance from snout to first dor- 

 sal -*- of length. HeadS. I). 56; A. 45; V. 8. Greenland. (Collett.) 



(1 Motella argentata Eeinh. Selsk. Nat. Math. Afh. 1837, 110: Motella reinhard/i 

 Kroyer MSS. ; Collett, Norske Nord-Havs. Exp. 18bO, 131: Onos reinhardti Gill, Proc. 

 Acad. Nat. Sci. Phila. 1863, 241: ? Concilia argentata Giiuther, iv, 383, the young of 

 this or other species of Onos; small, silvery tishes, swimming at the surface in the 

 opeu sea.) 



122. O. eaisis (Reinh.) Gill. 



Head small; snout with two barbels; chin with one; teeth feeble, 

 uniform, in villiform bands; palatine teeth villiform. Vent nearly me- 

 dian; distance to front of dorsal f of length. First dorsal ray pro- 

 duced, as long as head. Head 5f; D. 59; A. 46. Greenland. (Col- 

 lett.) 



(Motella ensis Keiuh. Dausk. Vidensk. Selsk. Nat. vii, 115, 1838: Onos cnsis Gill, Proc. 

 Acad. Nat. Sci. Phila. 1863, 241; Collett, 1. c. 134.) 



