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NATURAL SCIENCES OF PHILADELPHIA. 



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deepest about midway in space between pectoral and v(>ntral bases, 

 edges convex. Caudal peduncle well compressed, rather slender, 

 least depth about | its length. 



Head well depressed, broad, upper profile a little more convex 

 than lower, and lower sides bulge a little so that they slope slightly 

 in above, lower surface nearly level. Snout broadly depressed, 

 nearly evenly convex as seen from above, well protruded, and length 

 about I its greatest width about opposite front of eyes. Eyes 

 without free eyelids, skin of head extending over, superior, elongate, 

 and slightly ovoid, and placed al)out first f in head length. Mouth 

 broad and moderately crescentic as seen from below. Lips broad, 

 fleshy, and with rather obsolete transverse plications, though on 

 mandibular portion indistinctly broken or divided into papillae. 

 Maxillary ending in short, basally thick fleshy barbel, tip sharp or 

 pointed, and measured along its upper free edge about equals eye 



Fig. 16. — Ochmacanthus taxistigma Fowler. (Type. 



in length. Inside and hidden, also a much smaller maxillary barbel, 

 its length about i that of outer, though similar in most respects. 

 Upper jaw with 6 series of uniformly small teeth, rows arranged 

 transversely and continuously at equal distances across anterior 

 portion of mouth, all more or less pliable except last series, which 

 firmly, entrenched. At least 7 distinct transverse series of similar 

 teeth arranged along each mancUbular ramus, and a few others not 

 in very regular order scattered about symphysis. No other teeth 

 in mouth. Inner buccal folds broad. Tongue far back, broad, fleshy, 

 depressed, and evidently scarcely free. Each end of lower lip forms 

 broad fold on side of head below maxillary. Mandible broad, 

 depressed, flattened on lower surface, and symphysis would form 

 opposite front edge of eye. Nostrils well separated, anterior much 

 more widely apart and close in front of eye, and both pairs with 



