746 CONTRIBUTIONS TO NORTH AMKIMCAX ICHTHYOLOGY - IV. 



396. CYCLOPTERUS Linnaeus. 



(LumpiiH Cnvier. ) 



(Artedi; Linnaeus, Syst. Nat.: type Cycloplvrus lumpus L.) 



Spinous dorsal present, sometimes disappearing with age; skin thick, 

 armed with series of bony tubercles; other characters of the genus 

 included above. (xvx/.<>-, circular; r.nnu-^ tin; from the circular ventral 



disk.) 



a. Dorsal spines nut disappearing with age; gill-opening a small slit on level of eye; 

 ventral disk large. (Eamicrotremua* Gill.) 



1141. C. spiiiosil* Miill. r.-- 



< 'olor olivaceous, the skin between the plates thickly punctate. Body 

 orbicular, cuboid anteriorly; base of spiuous dorsal and body behind 

 vent abruptly com] tressed; 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 1'Migth, 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 flex- 

 ible prickles; small plates ajong bases of all the tins; a series of ( large 

 plates extending backward from above eye to opposite the interval be- 

 tween dorsals; a series of .1 on each side of middle of interocular space 

 fr ..... snout to nape, these increasing much in size posteriorly: a series 

 of .'! along opercular margin; along base of spinous dorsal, a series of 

 1. not connected with that of interorbital space: a single large plate on 

 each side of the interval between dorsals; two longitudinal series of 4 

 large plates eacli. beginning above base of pectorals and behind gill- 

 slits, terminating under the space between dorsals; the largest j date on 

 bod\ is immediately behind axil of pectoral ; a smaller one below it, and 

 two others between it and origin of anal ; two 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. Head 

 :',: depth nearly I'. D. YII-11; A. HI; <'. 10. Alaska to Iceland, soat h 



(Jill. I'me. Ai-ail. Nat. Sri. I'hila. l-.'.t. I'll": t>|.i- r//r/..;j/,r;rx ,S;M//<W<* Mull. 

 (v/u>i/ji> : , vei\ Miiall: ri>r/iti.. aperture, I'miu the small gill-openings.) 



