1906.] NATURAL SCIENCES OF PHILADELPHIA. 119 



(Urspov^ fin, with reference to ventral; 'popi^oi, Rhombus, a rhomb 

 or diamond, and formerly applied to species of Seserinus, Palometa 

 and Poronotus.) 



SESEKINTJS Quoy and Gaimard. 



Seserinus Cuvier, in Quoy and Gaimard, Voyage de TUranie, ZooL, 

 Jan.-Mar., 1825, p. 384 {xanthurus), has priority over Peprilus Cuvier, 

 Regne Animal, Ed. II, II, 1829, p. 214 {longipennis = paru), now 

 in use. Cuvier's account in I.e. . Ed. I, II, 1817, p. 342 {alepidotus = paru) 

 cannot be used on account of its vernacular form. Seserinus xanthurus 

 Quoy and Gaimard examined. 



NOMEID^. 

 Psenes chapmani sp. nov. Fig. 3. 



Head 3; depth H; D. X, I, 23; A. Ill, 25; P. ii, 17; V. I, 5; scales 60 

 in lateral line to base of caudal ; 9^ scales vertically between origin of 

 soft dorsal and lateral line, and about 25 vertically between latter and 

 origin of soft anal ; width of head 2 in its length ; depth of head over 

 middle of eye about equal to its length ; snout 3i ; eye 3 ; maxillary 3 ; 

 interorbital space 3; least depth of caudal peduncle 3; pectoral Ij; 

 ventral If. 



Body deep, compressed, rather ovoid, profiles similar, and greatest 

 depth about origin of soft anal. Caudal peduncle compressed, and its 

 least depth about 1\ in its length. 



Head deep, compressed, profiles steep, and similar, blunt in front. 

 Snout short, blunt, convex, upper jaw but slightly projecting. Eye 

 rather large, circular, anterior, and its lower margin about midway in 

 depth of head. Mouth small, jaws about even, and maxillary extend- 

 ing obliquely down barely opposite front margin of orbit. Teeth in 

 jaws uniserial, rather pronounced, well separated and sharp. No 

 teeth on roof of mouth. Tongue rounded, and free in front. Nostrils 

 small, very close together, and well in front of eye above. Inter- 

 orbital space convexly elevated. 



Gill-opening extending forward about opposite front rim of orbit. 

 Rakers 11+20, clavate, a little shorter than filaments which are aljout 

 2 in orbit. Pseudobranchise nearly as large as filaments. 



Scales small, those above lateral line forming series parallel with 

 its course, and those below forming horizontal longitudinal series. 

 Except interorbital space, supraocular region, nasal region, snout, 

 mandible, and branchiostegal region, head is covered with scales, 

 those on middle of cheek and opercle largest. About 7 series on cheek. 

 Scales in front of spinous dorsal small and crowded. Vertical fins 



