EIGENMANN: the PYGIDIID^, a family of south AMERICAN CATFISHES. 371 



behind the angle of the mouth; mouth subinferior; several series of strong teeth in 

 each jaw; gill-membrane broadly united with the isthmus, without a free margin; 

 opercular and subopercular patches of spines confluent. 



1. Miuroglanis platycephalus Eigenmann & Eigenmann. 



Mmroglanis platycephalus Eigenmann & Eigenmann, Proc. Cal. Acad. Sci. (2), 



II, 1889, p. 56 (Jutahy); Occasional Papers Cal. Acad. Sci., I, 1890, p. 347; 



Proc. U. S. Nat. Mus., XIV, 1891, p. 37; Eigenmann, Reports Princeton 



Univ. Exped. Patagonia, III, 1910, p. 401; Ribeiro, Fauna Bras., IV (A), 



1912, p. 227. 



Habitat. — Jutahy. 



Known from the type 17 mm. long, collected during the Thayer expedition by 

 William James. A recent search for it in the collections of the Mus. Comp. Zool. 

 has failed to locate it. 



Head 5.5; D. 10; A. 15. Body short, compressed, and rather deep. Head 

 greatly depressed, wider than long. Eye large, lateral, placed behind the angle of 

 the mouth. Mouth subinferior, the upper jaw projecting slightly. Upper maxil- 

 lary barbel scarcely extending to the gill-opening; no nasal barbels. The opercular 

 and pre-opercular patches of spines united. Origin of the dorsal fin little behind 

 that of the anal, its distance from the tip of the snout somewhat less than twice its 

 distance from the tip of the caudal. 



Appendix to the Monograph on the Pygidiid.e. 

 PHREATOBIUS''^ Goeldi. 



Phreatobius Goeldi, Comptes Rendus Congres Intern. Zool., Berne, 1904, p. 549; 



Fuhrmann, Verhandl. Schweitz. Naturf. Gesellsch. Aarau, 1905, p. 50; 



Archives d,es Sciences Phys. Nat. Geneve (4), 20, 1906, p. 578. 



Type. — Phreatobius cisternarum Goeldi. 



Origin of dorsal slightly in front of origin of the ventrals, much nearer snout 

 than to caudal; no nasal barbel; maxillary barbel similar and about as long as the 

 two mental barbels, placed nearer the anterior nares than to the angle of the mouth; 

 the mental barbels of each side close together, but remote from their fellows of the 

 other side, placed directly below the maxillary barbel; mouth terminal, wide, the 

 lower jaw projecting; teeth in the upper jaw in about three series, in two series in 

 the lower jaw in front, in one series on the side; the inner teeth the larger and m 

 very regular series; gill-membrane extending but little above the base of the pec- 

 cistern; /3ios, 6 = life, 



