2100 Bulletin 4.7, United States National Museum. 



individuals, it is true, but until direct comparisons of series from the 

 Pacific are made with, others from the Atlantic it is hardly worth the 

 while to throw C. orbis in with C. splnosm. The 2 species are very closely 

 allied, but with our specimens it does not seem best to bring them together 

 as one. (Garinan.) Northern Pacific, south to Vancouver Island; not 

 rare. The specimen above described from St. George Island, Bering Sea. 



The following notes are taken from a very large specimen, 5 inches long, 

 from the Aleutian Islands. (Coll. Alaska Cominl. Co.) : 



Head 3; depth nearly 2; D. VII, 11; A. 10; caudal 10. Body orbicular, 

 cuboid anteriorly ; base of spinous dorsal and body behind vent abruptly 

 compressed; teeth in narrow bands; gill openings on a level with eye, 

 slightly narrower than orbit. Spinous dorsal not hidden, covered with 

 rough tubercles, similar to those on body, but smaller; width of ventral 

 disk slightly less than its length, and somewhat less than length of head. 

 Body covered with irregular roundish conical plates, varying much in 

 size, some of the larger with a central point, turned backward; all the 

 plates with small tubercles and slender flexible prickles; small plates 

 along bases of all the fins; a series of 6 large plates extending backward 

 from above eye to opposite the interval between dorsals ; a series of 5 on 

 each side of middle^of interocular space from snout to nape, these increas- 

 ing much in size posteriorly ; a series of 3 along opercular margin ; along 

 base of spinous dorsal, a series of 4, not connected with that of interor- 

 bital space; a single large plate on each side of the interval between dor- 

 sals: 2 longitudinal series of 4 large plates each, beginning above base of 

 pectorals and behind gill slits, terminating under the space between 

 dorsals; the largest plate on body is immediately behind axil of pectoral; 

 a smaller one below it, and 2 others between it and origin of anal ; 2 series 

 of smaller plates below eye ; many small plates interposed between the 

 series of large ones; very small plates on under side of head and middle of 

 tail; no plates between ventral disk and vent; none in axil of pectorals. 

 Color olivaceous, the skin between the plates thickly punctate. 



"Three young examples, the largest 27 mm. long, were dredged south 

 of Sannak Islands and in Bristol Bay (depth 19 to 70 fathoms). Fin 

 rays in these vary as follows: D. VI or VII, 9 or 10; A. 8 to 10. We 

 agree with Garman in considering it advisable to distinguish the north 

 Pacific form from E. spinosus, until adequate series can be compared." 

 (Gilbert.) (orUs, orb or sphere.) 



Cyclopterus orbis, GUNTHER, Cat., in, 158, 1861, Vancouver Island. 



Eumicrotemus orbis, JORDAN & GILBERT, Proc.TJ. S.Nat. Mus. 1880, 454; GARMAN, Disco- 

 boli, 36, 1892. 

 Cyclopterus spinosus, JORDAN & GILBERT, Synopsis, 746, 1883 ; not of MULLER. 



780. LETHOTREMUS, Gilbert. 



Lethotremus, GILBERT, Kept. U. S. Fish Comm. 1893 (1896), 449 (muticus). 



This genus differs from Eumicrotremus in the total absence of the bony 

 plates, and of lateral line or pores on sides of head and body. The skin is 

 either smooth or armed with scattered prickles. (krfQr/, forgetfulness ; 

 Tptfjua, apertures.) 



a. Dorsal rays VII, 11 ; anal 10 ; skin perfectly smooth. MUTICUS, 2437. 



aa. Dorsal rays V, 7 ; anal 6; skin prickly. VINOLENTUS, 2438. 



