108 CALIFORNIA ACADEMY OP SCIENCES. 



First pectoral ray similar to the first dorsal ray, with 

 short teeth on its posterior margin, not shorter than the 

 longest ray, reaching a little beyond base of ventral in 

 the larger specimen, 1^ in head. 



Color light brown, silvery below, with dark spots 

 along sides of body; a dark streak forward from eye; tips 

 of dorsal dusky. 



Head 4; depth 7; Br. 9 or 10; D. 7; A. 12. 



Fourteen specimens; Buenos Ayres. 



72. Luciopimelodus pi at anus. 



Pimelodus platanus Giinther, Annals Nat. Hist. (5) vi, 10, 1880 



(Parana, Kio Plata). 

 Habitat: Kio Plata. 

 This species is known only from the types. 



XIV. PSEUDOPIMELODUS. 



Pseudopimelodus Bleeker, Ichthol. Arch. Ind. Siluri, 

 196, 1858 (sp.); id., Nederl. Tijdschr. Dierkunde, i, 1863 

 ( bufonius= zungaro). 



Batrachoglanis Gill, Ann. Lye. Nat. Hist. N. Y. 1858 

 (raninus). 



Zungaro Bleeker, 1. c. 101, 1863 (zungaro). 



Lopkiosilurus Steindachner, SB. Ak. Wien, Ixxiv, 

 1876. Ichthyol. Beitr. v, 106 (alexandri). 



Type: Pimelodus raninus Cuv. & Val. 



Eye covered with skin; orbit without a free margin; 

 dorsal plate well developed, usually joined to the occipi- 

 tal process. Head broad, depressed. Dorsal and pec- 

 toral spines well developed. Caudal rounded or emar- 

 ginate. 



Habitat: Region between the Rio Plata and Rio 

 Magdalena. 



ANALYSIS OF THE SPECIES OF PSEUDOPIMELODUS. 



a. Head very large; very much depressed, flat; mouth oblique; lower jaw 

 projecting. (LopniosiLURUs). 



