PLEURONECTIN^ 327 



Isopselta isoUpis, Jordan, 1887, Rep. U.S. Com. Fish., xiii, (1885), p. 023 ; Jordan and Goss, 1889, 

 Rep. U.S. Com. Fish., xiv, (1886), p. 285 ; Jordan and Evermann, i8g8. Bull. U.S. Nat. Mus., 

 xlvii (3), p. 2642 ; Starks, 1911, Ann. Carnegie Mus., vii, p. 204 ; Starks, 1918, Calif. Fish 

 Game, iv (4), p. 14, fig. 96. 



Depth of body 2j to 2| in the length, length of head 3I to 4 Snout about as long 

 as eye, diameter of which is 45 to 5I in length of head and 2J to 4 times interorbital 

 width ; lower eye scarcely in advance of upper ; post-ocular ridge not apparent. 

 Maxillary extending to below anterior edge or anterior part of eye, length on ocular 

 side about 4, on blind side 3J to 3f in that of head ; lower jaw a little projecting, 



2f to 2j in head ; dental formula _ , — — . 7 or 8 gill-rakers on lower part 



of anterior arch. 85 to 88 scales in lateral line, 24 to 28 between lateral line and 

 middle of back. Posterior prolongation of supratemporal branch of lateral line 

 extending to below twenty-first to twenty-eighth rays of dorsal fin. Dorsal 82-91 ; 



Fig. 242.— Isopsetta isoh-pis. B.M. (N.H.) 90. 



highest rays about i length of head. Anal 62-68. Pectoral of ocular side with 

 II to 13 rays (6 to 10 branched), length i J to if in that of head. Pelvics with 6 rays. 

 Caudal with 18 rays (12 branched), rounded or double-truncate; caudal peduncle 

 2 to 2J times as deep as long. Pale brownish, sometimes mottled or blotched with 

 darker. 



Type. — United States National Museum (co-types). No. 271 16. 



Distribution. — Pacific coast of North America, from Puget Sound to southern 

 California. 



Specimens Examined : 



I (188 mm.). 

 I (203 ,, ). 

 3 (235-285 m 



Puget Sound. 

 San Francisco 

 Pt. Reyes, Cal. 



Cal. 



U.S. Xat. Mu 



Eigenmar 



This species grows to a length of about 15 inches and occurs in rather deep water. 

 In general appearance it bears a marked resemblance to Psettichthys melanostictus, 

 and it should perhaps be placed near that genus. The small, asymmetrical mouth 

 and blunt teeth, however, indicate relationship with the Flounders. 



