198 PROCEEDINGS OF THE ACADEMY OF 



UROPSETTA Gill. 



Uropsetta caiifornica Gill. 



Hippoglossus californicus Ayres, Cal. ii. 29, f. 10. 

 Pseudorhombus californicus Gthr.. iv. 426. 

 Uropsetta caiifornica Gill, Pa.. 1862, 330. 

 Hab. California. 



HIPPOGLOSSUS Cuv., Gill. 



Hippoglossus . 



Pleuronectes bippoglossus Pallas, Ros. As. iii. 421. 

 Hippoglossus vulgaris Ayres, Cal., i. 40; ii. 30. 

 Ilab. California northwards. 



Subfamily RHOMB1NJE (Bon.) Gill. 



ORTHOPSETTA Gill. 



Orthopsetta sordida Gill. 

 Psettichthys sordid us Grd., Pa., vii. 142. 

 t'itharichtbys sordidus Gthr. iv. 421. 

 Orthopsetta sordida Gill, Pa., 1862, 330. 

 Hab. California. 



METOPONOPS Gill. 



Metoponops cooperi Gill. 



Metoponops Cooperi Gill, infra. 

 Bab. California. 



Description of a new Generic type of PLETJRONECrOIDS in the Collection of 

 the Geological Survey of California. 



Genus METOPONOPS Gill. 



Body rather elongated rhomboid, with the dorso-nasal outline nearly recti- 

 linear, and with the caudal peduncle moderate, somewhat constricted. 



Scales moderate, cycloid, oblong, or oval, imbricated, covered also with 

 smaller supernumerary scales. Lateral line perfectly straight, but slightly 

 decurrent anteriorly, continuous in simple tubes on each scale. 



Head scaly, moderate, conic, with the oblique profile rectilinear; the snout 

 somewhat elevated and subtruncated, and the interorbital ridge prominent 

 sideways. Eyes sinistral, oval, rather large, situated almost entirely in the 

 anterior half of the head, the lower lateral ; the upper directed obliquely up- 

 wards : the interorbital area narrow, scaly, channelled between the eyes, and 

 borderel by two ridges which converge above behind. Nostrils narrow, be- 

 tween snout and eyes and parallel with the former; the anterior with a long 

 Map or bridle in front; the posterior simple. Opercula normal. 



Mouth large and very oblique ; the supramaxillary ceasing under the pupil 

 of the eye, extended obliquely downwards behind, and with a semicircular 

 arch at its upper angle. Lower jaw truncated in front, with a tubercle be- 

 low. Lips very thin and simple. Tongue elongated, narrow and free. 



Teeth equally developed on both sides, uniserial, approximated, subequal, 

 ratber small, curved conic and acute. Palate unarmed. 



Branchiostegal rays seven. Branchial membrane deeply emarginated below. 



Dorsal fin with its origin considerably behind the right posterior nostril, above 

 or rather behind the anterior margin of the orbit, regularly arched, with its 

 rays simple. Anal with its origin under or behind the inferior axil of the pec- 

 toral, and similar to the dorsal. 



[Sept. 



