FISHES FROM SAKHALIN. 



241 



Family Cottidae. 



24. Porocottus nigrescens, n. sp. 

 (PI- IX, figs. I & 2). 

 One specimen. Exact locality not given. Head (measured to tip of 

 opercular flap) 2-\ in total length without caudal ; height of body 5.] ; eye 



5- $- in head ; interorbital 5-f-j snout 4-I ; maxillary l\ ; first spine of first 

 dorsal 3f ; third spine 3^- ; penultimate spine 4§ ; last spine 8 X V ; first ray of 

 second dorsal 16-5-; second ray 2$-; third ray 2 T V ; sixth and seventh ray 

 2 each ; thirteenth ray 2\ ; penultimate ray 4^ ; last ray 4! ; first ray of 

 anal 4! ; second ray 37 ; seventh and eighth ray each 2f ; penultimate 

 ray 3^ ; last ray about 4 ; pectoral i^-; ventral 2, first preopercular spine 



6- | ; height of caudal peduncle 8 X V D. VIII — 15 ; A. 12 ; P. 16 to 17 ; 

 V. I. 3 ; C. (excluding rudimentary rays) 13; B. 6 ; L. lat. 38. 



Body moderately long, not compressed ; caudal peduncle a little 

 compressed. Head a little depressed, the sides slightly forming an angle 

 with the top. Postorbital part contained i-f times in length of snout and 

 eye. Eye moderate, lateral, high up ; interorbital rather wide, slightly 

 concave. Mouth wide, the lower jaw a little projecting. Teeth small, 

 conical, in rather wide bands on jaws and vomer, none on palatines ; the 

 band on the uppper jaw widened anteriorly, but that on the lower jaw 

 nearly not widened. The band on vomer strongly curved, the great- 

 est width across equal to vertical diameter of the eye, but a little shorter 

 than its horizontal diameter. Maxillary extending a little past vertical 

 from postorbital rim. Both pairs of nostrils forming each a short tube ; nasal 

 spine distinct. No supraocular spine nor postorbital cirrhi. Postorbital 

 ridges, originating immediately behind eyes, gently converge behind and 

 bend abruptly outward at a point halfway between the postorbital rim and 

 the end of opercular flap. Outside of the ridges exists a less distinct 

 ridge as usual. First preopecular spine curved very slightly upward, 

 extending to a point slightly past one-third the length of its origin and the 

 end of opercular flap ; second preopercular spine two-thirds the first one, 



