478 PROCEEDINGS OF THE ACADEMY OF [July, 



D. III. 6, II ; A. I, I, 4, i: P. 28; V. 16, iv; scales about 63 in lateral 

 line to base of caudal, and tubes in about same niuiiber; about 36 

 small scales before dorsal; about 15 scales in a vertical series between 

 origin of dorsal and lateral line; 8 scales obliquely back from origin of 

 anal to lateral line; about 28 scales between last dorsal ray and first 

 rudimentary caudal ray; head, to occiput, 1^ in its greatest width; 

 length of snout about 1^ in length of head to gill-opening; width of 

 mouth onl}' a trifle less; interorbital space 2; internasal space 3^; 

 greatest width of breast between bases of pectorals ventrally equal to 

 greatest width of head, and same of ventrals 1| in latter; length of 

 depressed dorsal a little less than length of head; caudal 1; length of 

 depressed anal 1^; least depth of caudal peduncle 2\. 



Body depressed, broad, narrow in profile with greatest depth at 

 origin of dorsal. Greatest width of body that of head opposite gill- 

 openings. Ventral surface flattened, and with a small cutaneous or 

 fleshy flap on costal region between pectoral and ventral. Caudal 

 peduncle small, compressed, and its length about equal to its least 

 depth. 



Head large, convex above, flattened below and separated from breast 

 by a thin cutaneous fold. When viewed from above profile is truncate 

 in front. Snout pronounced, though not beyond margin of disk. Cheek 

 not convex. Mouth very broad, without teeth, osseous jaws smooth, 

 and lips thin, upper broader. Tongue not developed. A small, short, 

 fleshy papilla at each corner of mouth, and four others along upper lip. 

 Eye small, circular, superior, directed laterally, and near last fourth in 

 length of head. Eyelid free. Nostrils conspicuous, adjoining or only 

 separated by a thin frenum, and near last third in length of snout. 

 Interorbital space broad, a trifle convex, or rather flattened. 



Gill-opening small, its length a little more than orbit, and nearly 

 midway in depth of head above base of pectoral. 



Scales small, striate, and those on anterior part of body minute and 

 crowded. Head naked and also entire lower surface within disk. 

 Fins scaleless. Scales extending on post-ventral region. Head with 

 a number of small pores above. Lateral line of simple tubes, contin\i- 

 ous, and about midway in depth of body. 



first branched dorsal ray highest, and origin of fin midway in body 

 without caudal. Anal well posterior, first ray spine-like, first branched 

 ray longest, origin of fin nearer base of caudal than base of last dorsal 

 ray, and depressed fin reaching past latter. Caudal oblong, ex})anded 

 and truncate with rounded corners. Pectoral and ventral arranged 

 to form an abdominal disk, and both with long bases. Radii of both 



