1911.} NATURAL SCIENCES OF PHILADELPHIA. 215 



bone. Similar more erect and uniform mandibular teeth, not con- 

 nected over symphysis. Apparently no vomerine, palatine or ptery- 

 goid teeth. Tongue small rounded smooth knob in mandible anteriorly. 

 Upper surface of basibranchial shaft finely asperous. Mandible 

 convex over surface, constricted to point at symphysis, rami not 

 elevated inside mouth, sloping gradually toward articulation behind. 

 Mandible included within upper jaw, so that snout protruded a little, 

 and its tip extends little beyond anterior nostril. Nostrils small, 

 together, a little nearer eye front than snout tip. Interorbital broadly 

 convex. Each supraorbital ridge distinct, flaring slightly over each 

 eye anteriorly. Cheek would form an equilateral triangle. Cheek 

 and opercle smooth, except for a number of transverse mucous arbores- 

 cent channels or tubes. 



Gill-opening forward to front eye edge. Rakers about IS + 25, 

 slender, pointed, compressed, inner edges minutely denticulated, 

 1^ in eye. Filaments If in eye. Pseudobranchia 1 3 in eye. Isthmus 

 long, slender, narrowly compressed, lower edge level and not trenchant. 

 Branchiostegals about 10, membranes apparently scarcely united 

 anteriorly. 



Scales largely adherent, narrowly imbricated, disposed in even 

 longitudinal series, more or less uniform in size. Each scale with 

 2 to 4 vertical stria?, and about 3 anterior horizontal. Caudal base 

 scaly, scales becoming small on bases of lobes, and inner bases of lobes 

 each with an area of crowded elongated or horizontal scales. Dorsal 

 and anal with basal scaly sheaths. Long pointed distally free axillary 

 pectoral scaly flap but trifle less than fin in length. Similar axillary 

 ventral scaly flap. 



Dorsal origin midway between snout tip and caudal base, anterior 

 rays elongate and graduated down from first branched. Anal origin 

 about opposite first third in dorsal length, anterior rays elongate and 

 graduated down from first branched rays, fin low posteriorly. Caudal 

 emarginate (damaged), and lobes apparently pointed and equal. 

 Pectoral f to ventral. Ventral origin nearer that of anal than of 

 pectoral, fin about half-way to anal. Vent close before anal. 



Color in alcohol generally pale brownish, everywhere with traces 

 of silvery sheen. Head largely silvery on sides and below. A broad 

 silvery lateral band, about equals vertical eye-diameter, becomes a 

 little constricted at shoulder and along caudal peduncle side. This 

 well defined. Iris silvered white. Fins all pale brownish- white. 



Length (caudal tips a little damaged) 4 inches. 



Type No. 1,346, A. N. S. P. Surinam. Dr. Constantine J. Hering. 



