214 CALIFORNIA ACADEMY OF SCIENCES. 



Eye 10| in head, 5 in snout, 44 in interorbital space; 

 2 diameters behind angle of mouth. 



Teeth all alike; those of the upper jaw in a broad 

 crescent-shaped patch; its depth at the middle being 

 one-half its width; teeth on vomer and palate in four 

 patches forming a horse-shoe. 



Gill-membranes separate to in front of eye; gill-rakers 

 overlapping, 3+13. Dorsal spine 2^ in head. Adipose 

 fin shorter than the anal. 



Caudal deeply lobed, lower lobe longer and wider, 2 in 

 head; the rays normal. 



Ventrals extending two-thirds their length beyond the 

 vent; eye 3| in distance from vent to anal. 



Pectoral spine 2 in head; teeth on its posterior edge 

 and near the tip on its anterior margin; pectoral pore 

 moderate. 



Color brownish above; lower half of body and head 

 white; a dark lateral band extending upon the caudal. 



Head 3; depth 74; Br. 13; D. I, 6; A. 18; large thin 

 plates on the anterior portion of the lateral line. 



Numerous specimens; Manacapuru; Sao Paolo; Fonte- 

 boa; Tabatinga; Hyavary; Teffe; Obidos; Maranon; 

 Ucayale; Iga; Lago de Manimo; Para; RioPuty; Jutahy; 

 Rio Sario. 



XXXVII. SORUBIMICHTHYS. 



Platystoma Agassiz,Gen. et Spec. Pise. Bras. 1829 (sp.) 

 Sorubim Spix, Gen. et Spec. Pise. Bras. 1829 (sp.) 

 Soruhhnichthys Bleeker, Nederl. Tijdschr. Dierk. i, 98, 



1863 (jandia^=^sj)citula). 



Type: Platystoma spatula Agassiz. 



The species of this genus are not well known; only 



one, planiceps, is represented in more than one museum. 



It is not improbable that all should be referred to one 



or at most to two species. 



Snout very broad; eyes superior; upper jaw much 



