1915.] NATURAL SCIENCES OF PHILADELPHIA. 205 



Interorbital broad, depressed. Fontanel well developed, broad in 

 front where it begins opposite hind nostrils and continues to occipital 

 plate, or about half space between snout tip and dorsal origin. 

 Occipital, parietal and predorsal plate more or less rugose. Humeral 

 process extends not quite to middle of pectoral spine, smooth and 

 mostly swollen in front. Opercle broadly triangular, smooth. 



Gill-opening extends forward nearly opposite hind pupil edge. 

 Rakers 4+13, firm, lanceolate, simple, about f of filaments, and 

 latter f of eye. No pseudobranchise. Branchiostegals 6, slender. 



Body covered with smooth skin. Head rugose, as previously 

 described. Spines mostly with fine lengthwise keels or striae. L. 1. 

 slopes down from shoulder till midway along side, mostly simple 

 or with many pores all along its lower extent. Back and sides also 

 with vertical series of pores. Axillary pore of pectoral distinct. 



Dorsal origin at first third in combined head and trunk length, 

 spine serrate along both edges and nearly straight, and first branched 

 ray longest. Adipose fin inserted little nearer caudal base than 

 origin of dorsal, large. Anal inserted little before dorsal, or at 

 first third between ventral origin and caudal base, first branched 

 ray longest. Caudal well forked, slender lobes pointed, equal head. 

 Pectoral reaches | to ventral, spine nearly straight and both edges 

 serrated. Ventral inserted slightly nearer caudal base than snout 

 tip, and fin extends | to anal. Yent slightly closer to anal than 

 ventral origins. 



Color in alcohol light broA\Tiish generally, slightly paler below, 

 and most of body with more or less silvery tinge. Fins mostly pale 

 brownish, and edges of ventrals and anal somewhat whitish. Iris 

 silvery. Maxillary barbels pale brown, others whitish. 



Length 87 mm. 



Type, No. 8,372, A. N. S. P. Dutch Guiana. Dr. Constantine 

 Hering. 



Nos. 8,373 to 8,375, A. N. S. P., paratypes, same data. They 

 show: Head 3f to 3|; depth 5f to 6|; A. vi, 11 to vi, 14; snout 

 2| to 3; length 82 to 84 mm. 



This species is related to Netuma upsulonophoriis (Eigenmann and 

 Eigenmann) from Rio Grande do Sul, in having the vomerine patches 

 of teeth united, though the palatine patches are of greatly different 

 design. The Brazilian species also differs in having the front edge 

 of the dorsal spine with granules. 



{Au?.6?j groove; iJ.tTw-»'^^ forehead; with reference to the occipital 

 fontanel.) 



