2 2 8 Memoir Sears Foundation for Marine Research 



Anal fin: length of base 2i, 18.7. 

 Pectoral fin: length 16.6, 18.7. 



Scales: ca. 40. 



Gill rakers: 13+21, 12+20. 



Fin rays: dorsal 13, I2; anal 21, 19; 



pectoral 11, 11. 

 Vertebrae: 40, ?. 



Body moderately compressed, its depth 4.5, 5.3 in SL. Head 4.5, 4.4 in SL, its 

 depth equal to postorbital length and about half of eye. Snout very short, projecting 

 about a third of its length beyond mandible, 7.2, 7.3 in head. Eye 3.8, 3.5. Post- 

 orbital part of head 1.85 in head. Maxillary distally rounded, scarcely reaching 

 beyond posterior rim of orbit, and not to articulation of mandible, 2.0, 1.9 in head. 

 Cheek very short and broad, scarcely forming a triangle, much shorter than eye. 



Dorsal fin with the longest rays reaching far beyond tip of last ray if deflexed, 

 its origin nearer to base of caudal than to eye. Anal with a prominent lobe anteriorly, 

 its origin slightly in advance of middle of dorsal base, its base 4.8, c^.-}, in SL. Pelvic 

 reaching more than halfway to anal, inserted about equidistant between base of pec- 

 toral and origin of anal. Pectoral nearly reaching base of pelvic, 1.2, 1.25 in head. 

 Axillary scale of pectoral missing in specimens examined. 



Color. Old specimens, in alcohol, faded, pale. Silvery lateral band rather diffuse, 

 narrower than eye. 



Range. Known from the type material from fresh water, the holotype being from 

 Jutahy River, the two paratypes from Lago Alexo, Brazil. Two small specimens also 

 are reported from the Rio Ucayali, in Peru. 



Synonyms and References: 



Amflovajameii Jordan and Scale, Bull. Mus. comp. Zool. Harv., ty, 1926: 410 (orig. descr.; type local. Jutahy 



R., Brazil; type MCZ 18014; two paratypes listed from Lago Alexo, Brazil); Myers, Proc. Calif. 



Acad. Sci., (4) 23, 1940: 441 (descr. after Jordan and Seale; Rio Ucayali, Peru). 

 Anchoviella jamest Hildebrand, Bull. Bingham oceanogr. Coll., 8 (2), 1943: 137, fig. 61 (descr., relation, with 



Amplova balboae Jordan and Seale). 



Genus Pterengraulis Giinther 1868 



Pterengraulis Giinther, Cat. Fish. Brit. Mus., 7, 1868: 384, 398; type species by raonotypy, Clupea atherinoides 

 Linnaeus 1758. 



Characters. Body rather deep, strongly compressed. Gill rakers short and broad, 

 especially in large examples, only about 11 on upper limb and about 14 on lower 

 limb. Dorsal origin about equidistant between margin of opercle and base of caudal. 

 Pelvic inserted about midway between pectoral base and dorsal origin. 



Size. A large size is attained, specimens 250 mm long being included in the 

 collections studied. 



Remarks. The anal fin is long, with about 30—33 rays, its origin being under, 

 or more usually in advance of, the dorsal origin. The teeth are small and of nearly 



