708 CONTRIBUTIONS TO NORTH AMERICAN ICHTHYOLOGY IV. 



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

 large, depressed, subrliomboidal 5 preopercle with a single hoolied spine; 

 operele without longitudinal rib or vspine; lower jaw and other parts of 

 head with numerous large pores. Mouth moderate. Ventrals small. 

 Skin naked; a slender filament over each eye, aud one on each side of 

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

 13; V. I, 3; B. 5. Bering's Sti aits. {Gill.) 



{Porocottus quadrifilis Gill, Proc. U. S. Nat. Mus. 1859, 166.) 



36§.— GYMIVACAIVTHUS Swainson. 

 (PJwietor Kroyer.) 

 {Gymvocanthus Swainson, Class. Fish. iSrc, 1839, 271: type Cotttis ventralis C. & V.) 



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

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

 The upper i:)reopercular spine is armed with 2 or 3 antler-like processes, 

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

 of the Arctic Seas, [yun^uq, naked; a7.d.>0a^ spine.) 



l©§8. G. pi$tillig:er (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 j^ale blotches; second dorsal with alternating 

 oblique bauds of white aud blacki.sh; anal and caudal nearly plain; j)ec- 

 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; interorbital area with smooth skin. Eyes very large; maxil- 

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

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

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

 high 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 broad, reachiug past front of anal, the lower rays rapidly 

 shortened; ventrals extremely long, the rays long-exserted, reaching 

 past front of anal; anal papilla large. Head 3^ ; depth 4|. D. XII- 

 16; A. 18; V. I, 3; P. 16; vert. 12 -f- 18. Arctic Seas, south to Norway, 

 Alaska, and Labrador. 



{Coitus iwmVxger Pallas, in Cuv. «fc Val. ir. 193, 1829: Coitus ventralis Cnv. & Val. 

 iv, 194: Cottus pistiUitjer Pallas, Zoogr. Ross.-Asiat. iii, 43, printed 1811, published 

 1831: AcanthocottuH patris H. R. Storer, Bost. Jouru. Nat. Hist, vi, 250: Cottus ventralis 

 Giinther, ii, 167: Coitus instilliger Giinther, ii, 167: Cottus iriciispis Reinh. Videusk. 



