662 



PROCEEDINGS OF THE NATIONAL MUSEUM. 



VVe take pleasure in naming this species for Dr. Emilio A. Goeldi, 

 of the Museo Paraense, who has described the modifications with age 

 in the species of this genus. 



Type.— Q?it. No. 52561, U.S.N.M. 



BRACHYPLATYSTOMA VAILLANTI ( Cuvier and Valenciennes). 

 BRACHYPLATYSTOMA ROUSSEAUXII (Castelnau). 



One specimen cacli. 



T^NIONEMA, new subgenus. 



This subgenus resembles I>r(ich[/j>l<(tysfoijia but has flattened Ijand- 

 like barbels and a minute e^^e. Vomerine patches of teeth much deeper 

 than the palatine patches, the two forming a comma-shaped patch mucli 

 as in Ps€udoplatij>!toma. Head extremel}^ depressed; dorsal and pec- 

 toral spines feeble, not pungent. 



Type. — T. steerei, new^ species. 



Fir;. 2. — T^monema steekei. 

 TiENIONEMA STEEREI, new species. 



Head extremel}- depressed, about three times as long as deep, its 

 length contained 3^ times in length of body. Snout spatulate, pro- 

 jecting little beyond the mandi))le; eye extremely small, situated in 

 the posterior half of the head, its diameter contained 3 times in the 

 interorbital (4 times in plcdynema); occipital process short, widelj^ 

 separated from the dorsal fin; upper half of the head covered with 

 reticulated skin; e3'e a little more than twice as long as the fontanelle, 

 its diameter contained 17 times in length of head, about 10 times in 

 snout. Maxillary barbel reaching tip of ventrals. Branchiostegals 

 V2. B. 1,6; A. Ill, 12; head, 3i; depth, 7i. 



The first ray of the dorsal is contained If times in length of head; 

 adipose fin 2i times as long as deep. Length of base of adipose fin 



