1906.] NATURAL SCIENCES OF PHILADELPHIA, 317 



point is also greatest depth. Lower profile more or less evenly convex. 

 Caudal peduncle compressed, and its length equals about f its least 

 depth. 



Head robust, broad and convex on upper surface with profile nearly 

 straight or only very slightly concave, and lower surface- but little 

 restricted, though more evenly convex. Width of head more or less 

 even. Snout broad, rather short, convex above, and broadly rounded 

 when seen from above. Eye circular, anterior, and a little above 

 middle in depth of head. Eyelid narrow. Jaws broad, rounded, almost 

 even or upper a trifle produced. Lips thick and fleshy, and teeth as 

 in preceding species. Upper buccal flap broad and with a median 

 fleshy tubercle in front. liOwer buccal flap broad. Tongue and 

 nostrils as in preceding species. Interorbital space also similar, and 

 fontanel rather narrow. Postorbitals largest in suborbital chain. 

 Cranium 'and suborbitals with mucous canals, some arborescent. 

 Opercles with traces of very faint radiating strise. Gill-flap narrow. 



Gill-opening extending forward till nearly opposite posterior margin 

 of pupil. Rakers in form of 4? + 8? or more short inconspicuous 

 fleshy points along outer edge of first branchial arch. Filaments long, 

 series on inner edge of first arch longer, equalling about f of orbital 

 diameter. Isthmus broad. Branchiostegals 4, large, well developed 

 and subequal. 



Scales rather small, striate, rather smooth, in even longitudinal or 

 horizontal series parallel with lateral line, and of more or less even size. 

 Small scales along bases of dorsal and anal and on that of caudal. 

 Ventral with a rather short pointed scaly flap about ^ length of (dam- 

 aged) fin. Predorsal region with a median keel. Postdorsal region 

 rounded. Upper and lower surfaces of caudal peduncle flattened. 

 Preventral region flattened posteriorly, and with a low or obsolete keel 

 anteriorly. Postventral region trenchant and with an obsolete keel 

 on each side, convergent posteriorly. Lateral line continuous, median 

 on side, extending on base of caudal, decm'ved a little in front, and 

 mostly of simple tubes except those on first 6 scales which are arl^ores- 

 cent. 



Origin of dorsal falling in vertical about midway between tip of 

 snout and origin of adipose fin, rays long, first branched one apparently 

 highest, and others graduated down so that last one is less than half 

 length of first. Adipose dorsal small, its base over bases of posterior 

 anal rays. Anal inserted nearly midway between base of last dorsal 

 ray and base of caudal, anterior rays longest and edge of fin a little 

 concave. Caudal emarginate, lobes apparently broad. Pectoral low, 



