372 



MEMOIRS OF THE CARNEGIE MUSEUM. 



toral, narrowly joined to the isthmus at a point about half-way between its pos- 

 terior angle and the snout; first pectoral ray not spinous; anal very long, its origin 

 under the end of the dorsal, its base more than one-third of the length; caudal small, 

 accessory rays large and numerous, continuous with the anal fin and extending as a 

 similar fin on the back for two-fifths of the distance to the snout; opercle and inter- 

 opercle unarmed; eyes rudimentary, near the posterior nares. 



This genus is distinguishable by the concomitant elongation of the caudal 

 portion of the body, the anal fin and the accessory portion of the caudal, by the 

 position of the dorsal in relation to the ventrals and by the development of the 

 barbels and absence of opercular armature. 



1. Phreatobius cisternarum Goeldi. (Plate LVI, figs. 1, 2 and 4.) 

 Phreatobius cisternarum Goeldi, Comptes Rendus Congres intern. Zool., Berne, 

 1904, p. 549; Fuhrmann, Verhandl. Schweitz Naturf. Gesellsch. Aarau, 1905, 

 p. 50; Archives des Sciences Phys. Nat. Geneve (4), 20, 1906; p. 578 (allied to 

 Clariidce, not to Leptosidm and Trychomycerice; fide Zoological Record). 



Fig._39. Phreatobius cisternarum Goeldi. (By permission of Dr. ( >. Fuhrmann.) 



The generic as well as specific descriptions of this species are drawn from photo- 

 graphs lent me by Dr. O. Fuhrmann, and from a specimen 40 mm. long, also sent 



