3i8 FLATFISHES (HETEROSOMATA) 



l>- 7<i to i|0 scales in lateral line ; posterior spine of interorbital ridge 

 usually well developed ; colour paler. 

 a. Eye 3s to 4 in head ; 10 or 1 1 gill-rakers on lower part of anterior 

 arch : intestine of moderate length, not much coiled ; spot 

 on lateral line, if present, not conspicuously ocellated. 

 * No bony prominence on anterior end of interorbital ridge ; 

 dorsal 70-76, anal 50-53 ; pectoral with 1 1 rays : no 

 distinct spot on middle of lateral line or below dorsal and 

 anal fins ....... 5. ccenosus. 



** Two bony prominences on anterior end of interorbital ridge ; 

 dorsal 6i-6q, anal 45-49 ; pectoral with 10 rays ; a 

 distinct black spot on middle of lateral line and a pair 

 below hinder parts of dorsal and anal fins . . 6, ritteri. 



fi. Eye 2 J in head ; 7 to g gill-rakers on lower part of anterior 

 arch : intestine rather long, fairly well coiled ; spot on lateral 

 line conspicuously ocellated with white ; two bony pro- 

 minences on anterior end of interorbital ridge . 7. ocellatus. 



Pleuroiiccles quadrituberculatus, Pallas,' from the Bering Sea, may be a species of 

 Pleuronichthvs, but the original diagnosis is too brief for a definite identification to 

 be made. 



I PLEURONICHTHVS DECURRENS, Jordan and Gilbert. 



.-.' ricttrunecU-s quadriUtberculaius, Pallas, 1814, Zoographia, lii, p. 423. 



PUuronuUhys ciriwsus {iwn Girard), l.ockington, 1880, I'roc. U.S. Nat. Mus., u, (1879), p. 97. 

 PUuronichthys quadrituberculatus. Jordan and Gilbert, 18S1, Proc. U.S. Nat. Mus.,iii, (1880), p. 50. 

 PUuronichthvs decurrens, Jordan and Gilbert, 1881, Proc. U.S. Nat. iMus., iii, (iSSo), p. 453 ; Jordan 

 and Gilbert, 1883, Proc. U.S. Nat. Mus., iv, (1881), p. 69 ; Jordan and Gilbert, 1883, Bull. 

 U.S. Nat. Mus., xvi, p. 8jq ; Jordan and Goss. 1889, Rep. U.S. Com. Fish., xiv, (1886), p. 282 ; 

 189S, Bull. U.S. Nat. .Mus., xlvii (3). p. 2637, pi. ccclxxv, fig. 926; 

 , Univ. Calif. Pub. Zool., iii (ri), p. 244 ; Starks and Thompson, 1910, 

 sxviii, p. 278 ; Starks, 191S, Calif. Fish Game, iv (4), p. 9, fig. 90 ; 

 1932, Copeia, No. 2, p. 67. 



Jordan and Ev 

 Starks and Morris, 1907, Unix 

 Proc. U.S. Nat. Mus., xxxviii 

 Schultz, Hart and Gunderson, 



Flc. 2ii.—rh-u,nnnMhvidiCHr,cni. U.M. (N,H.) 81 . 3 . 14 .6. X 



1814, ' Zoographia', iii, p. 423 



