272 DEEP-SKA FISHES OF THE ATLAXTIC BASIN. 



and inaudible; vomer and palate tootliless. Preopercnluni armed with short, stout, simple 

 spines. Bones of the skull thin. Gills 3J; no slit behind the last. Gill openings wide; 

 the membranes broadly attached to the isthmus. Gill-rakers tubercular, in moderate 

 number. Spinous dorsal low, separated by a deep notch from the soft dorsal. Pectorals 

 procurreut in front. Ventrals small; caudal rounded. Vent distant from the anal origin. 

 Head and body naked. Lateral line consisting of a series of large pores. 



This genus is represented by seven examples of the type species, M. ;:oiiiiri(.<i, Bean, 

 taken by the Albatross on August l>, 18S8, from station 2S5o, oft' Trinity Islands, iu 50o 

 N. lat., 154° W. Ion., at a depth of l.-)l) fathoms. 



Family CYCLOPTERIDv^. 



Cyclopteridce, Bonaparte, Cat. Metodico, 1846, 64. — Gill, Ait. Families of Fishes, 1872, xxx; Century Dic- 

 tionary, 1424. — Jordan and Gilbert, Bull, xvi, U. S. Nat. Mas., 744. — Gill, Proc. U. S. Nat. Mus., xiii, 

 366, 1891. 



Cyelopterina, GCntiier, Cat. Fish. Brit. Mus., in, 154. 



Cyclo2)teroidc(t, with a feebly ossified skel&ton and ventricose body, covered with thick 

 skin, which may be either smooth, tubercular, or spinous. Head short, thick; suborbital 

 stay present, thin and flattish. Mouth small, 'terminal; jaws lateral, with slender teeth in 

 bands; vomer and palatines toothless. Gill openings narrow, membranes bi'oadly joined 

 to isthmus and shoulder girdle. Branchiostegals 6. Dorsal fin long, its anterior portion 

 of flexible spines, sometimes hidden in adult by a fleshy hump, sometimes wanting. Soft 

 dorsal small, opposite and similar to anal. Caudal rounded. Ventral rudimentary, form- 

 ing the bony center of a thoracic sucking disk. Pectorals short, low, with bases broad and 

 procurreut. Pyloric cseca numerous. Vertebrae li'+lC. 



KEY TO THE GENERA OF CYCLOPTERID^. 

 (From Jordan and Gilbert, rearranged.) 



I. Spinous dorsal present, sometimes disappearing with age; skin tuberculate. 



A. Dorsal sj^iues iu adult hidden in a fleshy hump. Ventral disk small Cycloptrrus 



B. Dorsal opines not hidden in adult; gill opening a small slit; ventral disk large Eumkrotukmis 



II. Spinous dorsal wanting ; skin smooth or nearly so [Cycloptericiitii ys] 



Genus EUMICROTREMUS, Gill. 



Eumicroiremus, Gill, Proc. Acad. Nat. Sci., Phila., 1864, 190.— Collett, Norsk. Nordh. Exp., 67.— Goode 

 and Bean, Bull. Essex Inst, xi, 12. — Jordan and Gilbert, Bull, xvi, U. S. Nat. Mus., 957. 



Cyclopterids with a spinous dorsal, which is sometimes in adults hidden in the skin, 

 though never disappearing with age. Skin thick, armed with series of bony tubercles. 

 Gill opening a small slit on level of eye. Ventral disk large. 



EUMICROTREMUS SPINOSUS, (Muller), Gill. (Figure 250.) 



Cyclopterus spinosua, MiJller, Prodromus Zoologize DaniciB, 1777, ix. — Gaimard, Voy. Skand., Poiss., 

 pi. IV, fig. 2— GOnther, Cat. Fish. Brit. Mus., iii, 1861, 157; Proc. Zofil. Soc, London, 1877, 293, 

 fig. (young); ibid., 475; Challenger Report, xxil, 1887, 66.— Malmgren, Ofvers. K. Vet. Ak. Forh., 

 1864, 489, sp. 6.— Frisch, Peterm. Geogr. Mitth. 1865, Erg. Heft. Nr. 16, 35.— Heuglin, Fauna and Flora 

 in Geologic Spitzbergen iu Novaja Semlj.a, 1874, 211.— Jordan and Gilbert, Bull, xvi, U. S. N. M., 746. 



Lumptia spino8u.8, Storer, Syn. Fish. N. A., 1846, 230. 



Eumicroiremus npinosus, Gill, Proc. Acad. Nat. Sci., Phila., 1864, 190. — Collett, Norskc Nordh. Exped., 

 Fisk., 67, 111. II, fig. 13.— Goode and Bean, Bull. Essex lust., XI, 12.— Jordan and Gilbert, Bull, xvi, 

 U. S. N. M., 957.— Jordan, Cat. Fish. N. A., 116. 



Body orbicular, cuboid anteriorly, its height nearly oue-half of its length, which is 3 

 times the length of the head; base of spinous dorsal and body behind vent abruptly com- 

 pressed; teeth in narrow bands; gill openings on a level with eye, slightly narrower than 

 orbit. S]>iuous dorsal not hidden, covered with rough tubercles, similar to those on body, 

 but smaller; width of ventral di.sk slightly less tlian its length, and somewhat less than 



