470 CALIFORNIA ACADEMY OP SCIENCES. 



dark and a large dark spot anteriorly, again with four 

 dark brown cross-bars alternating with transparent. 



HeadSM; depth 2f; D. I, 7-8; A. 1,7; V. 6; P. 1,6-7. 

 Lat. pi. ||. 



Five hundred and thirty-four specimens. Cudajas. 



459. Corydoras natteren, 



Corydoras nattereri Steindachner, Ichthyol. Beitrage, v, 95. pi, xi, 

 figs. 1-lb (Rio Janeiro); Eigenm. & Eigeum. Proc. Gal. Acad.2d 

 Ser. i, 165, 1888 (Rios Doce and Parahyba). 



Habitat: Rio Janeiro to the Rio Doce. 



Short and deep, rapidly tapering to the caudal pedun- 

 cle. Head as deep as long, its width little less than its 

 length; profile evenly arched; fontanel small, between 

 the occipital and frontal bones; opercles and suborbitals 

 exposed; width of the occipital If in its length to tip of 

 occipital process; occipital process about twice as wide 

 at base as at tip. 



Eye 1J in the snout, 4 in the head, 2 in the inter- 

 orbital. 



Snout rather blunt; rictal barbels scarcely reaching 

 the gill-openings. Lower lip broad, free, terminating 

 in a pair of rather long barbels. 



Coracoid processes scarcely encroaching on breast and 

 belly. 



Three or four azygous plates before the adipose fin. 



Distance of the dorsal spine from the snout 2 in the 

 length; the spine 1J in the head, smooth in front, 

 slightly roughened behind; first ray higher than the 

 spine. 



Caudal deeply forked, 2J in the length. 



Pectoral spine similar to the dorsal spine, somewhat 

 longer, its inner margin strongly serrate. 



Light brown, a blackish lateral band; a dusky spot at 

 base of dorsal spine; anterior dorsal ray dusky; other 

 fins plain. 



