1888.1 PROCEEDINGS OF UNITED STATES NATIONAL MUSEUM. 601 



occurs in deep waters of the Gulf of Mexico. It was thought by Jor- 

 dan and Goss to be " probably type of a distinct genus."* It actually 

 is the representative of a hitherto undefined genus which may be named 

 and diagnosed as follows : 



CYCLOPSETTA. 



Psettines with the body oblong rhombo-ovate, covered with regu- 

 larly imbricated moderate cycloid scales; lateral line nearly rectilinear 

 on both sides; snout convex; mouth very large; jaws squarely truncated 

 behind ; teeth uniserial, those of upper jaws moderate, of lower jaw en- 

 larged and largest at sides ; dorsal and anal almost symmetrical,! dorsal 

 commencing in front of eye on snout, scarcely deflected ou blind side; 

 caudal slightly pedunculate and convex; pectorals subequal and with a 

 subtruncate free margin ; ventrals nearly equal, the left on the preanal 

 ridge, the right lateral, both with the inner rays connected by mem- 

 brane to the body; iuterbranchial membrane imperforate; gill-rakers 

 tubercular and surmounted by blunt denticles. 



Type C. Jimbriata. 



The scales on the eyed side are regularly cycloid with the nucleus 

 some distance from the posterior margin and with numerous radiating 

 stria?. The gill-rakers are quite characteristic. 



The A. (?) ventralis was originally made known by Goode and Bean as 

 the Citharichthys ventralis, and likewise lives in the deep parts of the 

 Gulf of Mexico. It was considered by Jordan and Goss to be " perhaps 

 type of a distinct genus." It is such and may receive the name of 



TEICHOPSETTA. 



Psettines with the body oblong, rhombo-oval, covered with adherent 

 ctenoid scales ; lateral line with an arch differentiated iu front on eyed 

 side, obscure but rectilinear on blind side; profile incurved or recti- 

 linear; mouth large; supraraaxillary bones obliquely truncated behind; 

 teeth small, somewhat enlarged and hooked iu front, uniserial; dorsal 

 and anal symmetrical behind, dorsal commencing on snout and deflected 

 towards right nostril; caudal subsessile and convex; pectorals very 

 unequal, the left obtuse, the right with the second and third rays ex- 

 tended and filiform; ventrals both free, very unequal; the left fin on 

 the abdominal ridge with a moderately broad base and six rays, the last 

 of which is attached by membrane to the ridge; the right fin with a 

 narrower base (and in the males with the inner four rays setiform, but 

 in the female nearly similar to the left fin); iuterbranchial membrane 

 imperforate; gill-rakers slender and unarmed. 



* Jordan and Goss, op. cit., p. 332. 



t Symmetrical in this connection refers to the fact that the fiu is not decurved 

 ou one of the sides. 





