708 CONTRIBUTIONS TO NORTH AMERICAN ICHTHYOLOGY IV. 



on upper axil, and another toward middle of base of pectoral. Head 

 large, depressed, subrhomboidal; preopercle with a single hooked spine; 

 operde without longitudinal rib or spine; lower jaw and other parts of 

 head with numerous large pores. Mouth moderate. Ventral s small. 

 Skin naked: a slender lilament over each eye, and one on each side of 

 nape. Gill-membranes forming a fold across the isthmus. D. VIII- 

 l.".; V. I, 3; B. 5. Bering's Stiaits. (Gill.) 

 (Porocottua quadnfiUs Gill, Proc. U. S. Nat. Mus. 1859, 16G.) 



368. CYMNACANTHUS Swainson. 



(Pliobetor Kroyer. ) 

 (Gymnocanthus Swainson, Class. Fish. &c., 1839, 271: type Cotius mitral is C. & V.) 



General characters and appearance of Cottus, but with no teeth on 

 the vomer, and with a small but well-defined slit behind the last gill. 

 The upper preopercular spine is armed with 2 or 3 antler-like processes, 

 and the tins are all very large, the ventrals notably so. Marine species 

 of the Arctic Seas. (yu^us, naked; axdvOa, spine.) 



1O8. O. pistilliger (Pallas) Gill. 



Dark brown above, with traces of darker vertical bars; belly pale; 

 males with the axillary region dusky, with many large round white spots; 

 first dorsal blackish, with pale blotches; second dorsal with alternating 

 oblique bauds of white and blackish; anal and caudal nearly plain; pec- 

 torals and ventrals yellowish, with black cross-bars; mandible barred 

 with black. Nasal spines small; occipital ridges low, the space between 

 them concave, with rough plates; supraorbital ridge ending in a blunt 

 tubercle; interoi bital area with smooth skin. Eyes very large: maxil- 

 lary extending to pupil; upper preopercular spine broad, much shorter 

 than eye, \\ith about three points; skin mostly smooth; axil prickly; 

 inner edge of middle pectoral rays papillose ( $ ). Spinous dorsal very 

 hi.uh and long, the longest spines in the male three-fourths length of 

 head: second dorsal a little lower; anal very long, rather low; pec- 

 torals very In-oad. reaching past front of anal, the Io\\cr rays rapidly 

 shortened: veiitndy extremely long, the rays loiig-exserfcd, reaching 

 past front of anal: anal papilla laru.e. Head 3*; depth -I)-. ]). XII- 

 L6| A. is; y. 1. :; : p. n; : rert. ll'+lS. Arctic Seas, so nth to Norway, 

 Ala-ka. and Labrador. 



' nlhix i,ixtilli : irr I'.-ill.-is. in Cuv. A V :) l. iv. 1!>:'. 1 -.".: r,,tl,is mitrali* Cuv. & V:il. 

 iv, l;il: i;,ttn>< i>i*tilli<in- i'allas. Zoogr. Boss.-Afiiat. iii, -\'.\, prinlcd 1-11, j.nblished 

 l-.'.l: dcanthocottiu patrit II. !>'. Stnn-r. lln-i. .lonrn. Nal. I list, vi, '_'.",(: Cull its rt utralis 

 Ciiiiili.-r. ii, Id?: <'<>ttn* i>i*tilli,n r ( iiim IHT, ii, It)?: Cottttx tricimpis Rcinh. Vidciisk. 



