1905.] 



NATURAL SCIENCES OF PHILADELPHIA. 



363 



Body elongate, well compressed, and greatest depth a little before 

 first third in total length of fish, profiles sloping gradually and evenly 

 back from this point to caudal peduncle. Upper profile before 

 dorsal very convex or gibbous so that back is well elevated in this 

 region. Caudal peduncle compressed, and its least depth about 1| 

 in its length. 



Head small, rather broad, compressed, upper profile strongly con- 

 cave to occiput and lower nearly straight and but little inclined. 

 Snout rather long, convex above, obtuse, rounded, and produced 

 beyond upper jaw. Eye circular, supraorbital infringing a little on 

 its upper anterior margin, and center of pupil only slightly behind 

 first third in length of head. Adipose eyelids well developed. 



Fig. 1. 



Mouth small, inferior, and transverse. Maxillary broad, reaching a 

 trifle beyond front margin of orbit, and its greatest expansion about 

 half of orbit. Jaws rather obtuse, mandible a little posterior. No 

 teeth. Tongue thick, rounded, obtuse, and hardly free. Nostrils 

 lateral on snout about midway in its length, adjoining, and anterior 

 with an elevated cutaneous rim. Interorbital space broad and a 

 little convex with a distinct median longitudinal ridge. Margin of 

 preopercle entire. A number of mucous tubes on cheek and pre- 

 opercle. Opercle with rather indistinct stria^. Gill-flap rather 

 narrow. 



Gill-opening extending forward about opposite posterior margin of 

 orbit. Rakers 9 + 13, pointed, rather strong, and longest a trifle less 

 24 



