1905.] 



NATURAL SCIENCES OF PHILADELPHIA. 



63 



Body plump, robust, compressed, and greatest depth about origin 

 of soft dorsal. Back about latter a trifle elevated. Caudal peduncle 

 rather thick, depressed above and below, and its least depth about | its 

 length. 



Head robust, plump, compressed, upper profile obtuse in front and 

 convex. Snout broad, convex, and obtuse. Eye circular, not high, 

 and its posterior margin well anterior to middle of length of head. 

 Adipose eyelid not broad. Mouth rather small, and small mandible 

 not produced beyond tip of upper jaw. Maxillary small, reaching 

 front margin of ]>np\\, slipping below preorbital most of its length, and 

 distal expanded extremity equal to diameter of pupil. Teeth fine, 

 small, and in narrow bands in jaws. Vomer and palatines with similar 

 teeth, those on former forming a backward elongation. Tongue rather 



Fig. 3. — Nnucratefi pohjsarcus Fowler. 



small, spatulate, free, and with a small aspcrous patch. Nostrils 

 adjoining, level with upper part of pupil, but a little nearer tip of snout. 

 Posterior with a cutaneous valve in front. Interorbital space broadly 

 convex. 



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

 Rakers 6 + 16, compressed, pointed, longest about f of orbit or about f 

 of longest filaments. Pseudobranchia? well developed. Isthmus 

 broad and with a median groove. 



Scales small, cycloid, and of more or less even size. Cheeks, post-^ 

 ocular, supraocular, mastoid, and occipital regions covered with small 

 scales, head otherwise naked. Postocular scales elongate. Opercles 

 striate. A patch of small scales extending along bases of soft dorsal 

 and anal in front. Base and basal region of caudal lobes also covered 



