6G THE VOYAGE OF H.M.S. CHALLENGER. 



Family Discoboli. 

 Cyclopterus, Artedi. 



The common Lump-sucker, Cijdo2^tenis lumjnis, is a shore fish, and has never been 

 observed to go into deep water, whilst its more northern representative {Cyclopterus 

 spinosus), like many other Arctic species, descends into the frigid strata of the deep sea. 



Cycloptera spinosus. 



Cudopteriis spinosus, Miill., Prodr., p. ix. 



„ „ Gaimard, Voy. Scand. Poiss., pi. iv. fig. 2. 



„ ,, Giintli., Fisb., vol. iii. p. 157; Proc. Zool. Soc. Lond., 1877, p. 293 



(fig. of young), and p. 475. 



„ „ Jordan and Gilbert, Synopsis, p. 746. 



Eumicrotremus spinosus (Gill), CoUett, Norsk. Nordli. Exped. Fisk., p. 67, pi. ii. fig. 13. 



This species extends from the southern coast of Greenland to lat. 82° N., and has 

 been obtained by the North Atlantic Expedition at a depth of 129 fathoms. If CoUett's 

 supposition, that the number of dorsal rays varies in this species between nine and twelve, 

 be confirmed by a more extensive series of examples, Cyclopterus orbis, from the North 

 Pacific, would probably prove to be the same species. 



__ Liparis, Art. 



Liparis fahricii. 



Liparis fahridi, Kriiyer, Nat. Hist. Tidsskr., ii., 1847, p. 274. 



„ „ Liitken, Kara-Havets Fisk. in Dijmplma-Togtet, jx 146, tab. xv. figs. 4-5. 



The only record of the occurrence of this common Arctic littoral species beyond 

 the 100 fathoms line is by Liitken, who states that he received a great number of 

 specimens from the Kara Sea, where they were obtained at depths varying from 46 to 

 106 fathoms. 



Liparis micropus, n. sp. (PI. XIL fig. B). 



D. 35-37. A. 35-36. 



This species approaches in some respects the genus Carcproctus, having the tail 

 particularly attenuated, and the ventral disc of unusually small size. The head is large 

 and thick, about one-fourth of the total length, the caudal included. The interorbital 

 space equals in length the postorbital portion of the head. Eye entirely in the 



