NO. 1358. JAPANESE SCULPINS— JORDAN AND STARKS. 267 



17. COTTUS POLLUX Gunther. 

 KA.TIKA. 



(hllns jinl/ii.r (ii-NTiiEH, Aiiii. ;iii(l Mag. Xiit. Hii^t., 1S73, 11. 240; Otani in ll<ik- 

 kaitio (Ishikari River). — I.siiikaw.a, Prel. Cat., ]cS<»7, ]•. 42; Tokazu River. 



Cottttf^ liUf/endorJi STKiNDAcnxEK and DiiDERi.Eix, Beitnige zur Keniit. <ler Fisclie 

 .TapanV, III, 1884, p. 40; IV, pi. iv (near Tokyo, probably Tana R.).— 

 IsHiK.wv.v, Prel. Cat., 1897, p. 48; Tsugaru, Uzen, Iwasliiro, Shiniotsuki, 

 Chichi))U, Yaniashiro, Kai, Kamo R., Katsura R., Tokyo. 



Head 8^ to 3| in lenoth without caudal; depth 5 to 5i. D. VIII 

 or IX-10 to 18; anal 11 to 13. Eye 5 in head; maxillary 2 to 2? in 

 head; interor])ital width | of e3"e; bone onh' i in eye. 



Body .sk^nder and head rather small. Teeth in nioderate band.s on 

 jaw.s. narrower on vomer; palatine.s toothless. Lower jaw inehided. 

 Maxillary \ arial)le with size; in the smaller examples (10 em. lono) it 

 does not reach past posterior margin of pupil; in the larger ones (1-1 

 cm. long) it reaches to posterior border of eye. Preopercle with but 

 one small hooked spine, u.sually covered by the skin; subopercle with 

 a very small spine at its anterior lower (md. luterorbital concave; top 

 of head evenly rounded. 



Length of ventrals variable; in the largest examples they nearly 

 always I'each to or cover the vent; in the smaller ones they sometimes 

 reach to vent or sometimes to end within a distance of vent equal to 

 the diameter of the eye. Pectoral reaches to opposite front of anal, 

 iis length 1^ or li in head. Dorsal spines slender, the longvst two- 

 thirds or three-fourths of the longest soft rays. Longest anal rays 2 

 in head. Caudal slightl}" rounded; its length H in head. Skin every- 

 where perfectly smooth. 



Color grayish or ])rown above, lighter or white below; back with 5 

 crossbars, the first under front of spinous dorsal, the next near pos- 

 terior end of spinous dorsal, the others more conspicuous and longer, 

 the middle one more oblicpie than the others, running from under the 

 fourth to seventh dorsal rays, becoming narrower below and reach- 

 ing ohliquely forward to toward a point just in front of anal, the next 

 bar under last dorsal rays and continued downward to light under 

 parts, the fifth across base of caudal. Some specimens are uniform 

 brown or gray above, shading rather suddenly but eveidy to the lighter 

 below; others especially the smaller ones are mottled with white and 

 the line on lower parts between the light and the dark is nuicli t)rok(>n 

 up and irregidar, sometimes the back and the top of head i)lentit'idly 

 sprinkled with small dark spots; the rays of the dorsals, pectoral, and 

 caudal are spotted with dark, making irregidar lines across fins; jin;d 

 and xentrals usually white: sometimes on tln' large specimens thei'e 

 are a few spots on the anal rays and the tips of the ventrals are dusky. 



Cotti/s hUijendoi'ji is certainly the same as Cottus pollu.f. The only 



