DISCUSSION OP SPECIES AND THEIE DISTRIBUTION. 383 



Two young specimens (133 iiiilliineters) were taken by the ITirondellc, one iu the gulf 

 of Gascouy at a depth of 77 fathoms, the other off Gape Finisterre in 200 fathoms. This 

 species resembles most closely 0. macroplithalimis, but has a smaller head, and differs iu 

 color aud dentition. 



ONOS REINHARDTII, (Kroyer), Collett. 



MoteUa arijcnlata, Ui:iN'ir.vi'.i>r, Ivsl. D. Vid. Selsk. Math. Nat. Copenhagen, 1837, c\. 



Motella lU-inhardIi, KuiiYEK, MS. of a))Oiit 1852.— Collett, ForhaniU. Vidensk. Selsk. f'Iiii,st., 1878, 83. 



— LiJTKEN, Vid. Meddel. uat. Foren. Kj0beuhavu, 1882, 236. 

 Onus Heinhardti, Coli.ett, Norsk. Noidh. Exjicd., Fisk., p. 131, pi. IV. lig. 34; Viil. Selsk. Forli., 18111, No. 11, 



Christiania. — GCntiieu, Challenger Kopoit, xxii, v. 97, pi. xix, lig. B. 



Barbels, 3. The length of the head is contained 4^ times in tlie total (without caudal), 

 the diameter of the eye 4| or 5 times in the length of the head ; it is shorter than the siujut, 

 equal to, or less in length than the interorbital space. The ma.xillary scarcely extends to 

 the hind margin of the eye. Both jaws and the vomer with an outer series of larger teetli. 

 Vent nearer to the root of the caudal than to the snout. The anterior ray of the first dorsal 

 fin rather longer than the eye. 



Radial formula: 1). 53-.'>!); A. 43-48; P. 22-24; Y. 8. Coloration uniform. (Gimthcr.) 

 Several specimens were obtained in the Faroe Channel by the Knight Errant in .j40, 

 60S, and 040 fathoms, and by the North Atlantic expedition in the open sea west of Bear 

 Island at a depth of 058 fathoms. Other specimens are known from Greenland. 



ONOS CARPENTERI, Gunther. 



Motella mncioplithalnm, OiNTliKU, Ann. and Mag. Nat. Hist., 1871, xili, 139 (not 1867). 



Onus Carjiciitcri, GiNTHER, Challenger Kejiort, x.\ii, 87, pi. XLii, D. — Collett, Vid. Selsk. Forhandl., 

 Christiania, 1891, No. 11. 



Barbels, 3. The length of the head is two-ninths of the total (without caudal); the 

 diameter of the eye two-ninths of the length of the head, as long as the snout, and longer than 

 interorbital space is wide. The inaxillaiy reaches to a. little behind the himl margin of the 

 orbit. Both jaws with teeth unecpial in size, some being enlarged and cauinclike. Vent 

 much nearer to the snout than to the end of the anal. The anterior ray of the first dorsal 

 fin about as long as the eye. 



liadial formula: D. 41); A. 45; P. 23; V. 0. Coloration uniform. {Giinthcr.) 

 One specimen only is known, 4i inches long, obtained during the cruise of H. M. S. 

 Porcupine, in ISO fathoms, between Shetland and Faroe. Collett writes that he formerly 

 regarded this specimen as representing a more advanced stage of growth of Onos macro- 

 phthalmus. 



ONOS TRICIRRATUS, (Blocii), Gooue and Bean. 



Gadiis tricirratiis, Blocji, IchthyoIogi<', pi. CLXV. 



Motella trtcirra(rt, NiLSSON, Prod. 48; Skaud. Fauna, iv, 586. — Vau.lant, Travaillenr et Talisman, 1888, 285. 



Snout obtuse, broad, rather depressed, with 3 barbels, one at each of the anterior nos- 

 trils, the third at the chin. Teeth villiform and of eipial size in the upper jaw. A series 

 of white dots along the lateral line (generally). ((Jiintltcr.) 



The "Three-bearde<l roi'kling, " which occurs along the coast of Europe from Scandi- 

 navia to the Mediterranean, was found by the TaU.sinan off Soudan at the depth of 640 

 meters (station LXXi), as well as by the Travailleur along the coast of JMorocco at 112 

 meters (station xxxiv). 



RHINONEMUS, Gill. 

 RhiiifiKiiKix, Gill, Proe. IT. S. Nat. Mus., 1863, 230.— Jordax and Gilueut, Bnll., .\v, IT. S. Nat. Mns., 7J7. 



Oniiie gadoids ha\ing a barbel at the snout as well as one at each nostril and one at 

 the chin. Head high anteriorly and compressed. No large canines. 



