1915.] 



NATURAL SCIENCES OF PHILADELPHIA. 



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and latter nearly f of eye. No pseudobranchise. Branchiostegals 

 5, slender. 



Body covered with smooth skin. Head smooth. Spines all more 

 or less smooth. L. 1. slopes down from shoulder, till midway along 

 side, simple. Axillary pore moderate. 



Dorsal origin about midway between front eye edge and anal 

 origin, spine slender, nearly straight, edges apparently entire. 

 Anal inserted slightly nearer caudal base than pectoral origin, first 

 branched ray (damaged) apparently longest. Adipose fin moderate, 

 2f in combined head and trunk length. Caudal damaged. Pectoral 

 moderate, reaches f to ventral, spine smooth on outer edge and 

 inner with about nine large serrse, of which longest at least little 



Fig. 4. — Pimelodella peruense Fowler. (Type.) 



more than half greatest width of spine. Ventral inserted slightly 

 nearer snout tip than caudal base, or below last dorsal rays, and 

 fin extends f to anal origin. Vent at first | in depressed ventral 

 length. Genital aperture well posterior, or slightly before depressed 

 ventral tip, and papilla long and conic. 



Color in alcohol largely brownish, under a lens seen to be made 

 up of very close-set small dots. Lower surface of head, belly and 

 sides paler, and on last extending up to lateral line. Fins all pale 

 brownish, outer portion of dorsal dusky. Iris slaty. Maxillary 

 barbels brownish and mental barbels whitish. 



Length 52 mm. (caudal tips damaged). 



Type, No. 21,932, A. N. S. P. Peruvian Amazon. Received many 

 years ago from J. Orton or J. Hauxwell. Presented by E. D. Cope. 



This species closely resembles Pimelodella lateristriga (Mtiller and 



