1894.] J^ rcope. 



CuRiMATus GiLBERTii Q. and G. 

 Numerous specimens. 



Sternopygid^. 

 Carapus pasciatus Pallas. 



Sternopygus virescens Val. 

 Apparently abundant. 



NEMA.TOGNA.THI. 



SiLURIDiB. 



Rhamdia sapo Val. 



Five specimens which agree with the description given by the Eigen- 

 manns, except in the possession of narrower bands of premaxillary and 

 dentary teeth. The premaxillary patch is five times as long as wide. 



Rhamdella straminea sp. nov. 



Surface of posterior cranial bones fossate, but covered with a thin skin. 

 Fontanel reaching base of supraoccipital process, with a narrow bridge 

 opposite the posterior border of the orbit. Adipose fin entering the lengtii 

 (to base of caudal) five times, and equal to depth of body ; length of 

 head entering total, four times. Upper lip projecting a little beyond 

 lower ; tooth band in both jaws wide ; teeth well developed. Eye 4 times 

 in length of head to angle of operculum ; one and a third times in inter- 

 orbital width, and one and a half times in length of muzzle. Centre of 

 pupil nearer end of muzzle than opercular angle. Maxillary barbels 

 reaching middle of ventral fins ; external mentals reaching base of pec- 

 toral fins ; middle mentals half as long as externals. Dorsal spine rather 

 slender, elongate, toothless ; pectoral spine more robust, longer than soft 

 rays, with eight robust spines on its internal border, and more numerous 

 smaller dentations on the anterior border, which are not recurved. Radii, 

 D. I t) ; A. 13 ; P I. 8. Caudal fin deeply emarginate, the superior lobe 

 a little longer than the inferior. 



Total length, 83 mm.; length to base of caudal fin, 68 mm.; length to 

 base of anal, 50 mm.; length to base of ventral, 33 mm.; length to base 

 of pectoral, 19 mm. Length of head to apex of supraoccipital process, 

 21 mm. 



Color in spirits, brownish straw-color, with silvery opercle, rather 

 sparselj^ dusted with black specks. Adipose fin dusky bordered. 



Five specimens of this species, which approaches the R. jenynsii Glhr., 

 according to the detailed description given by the Eigenmanns. That 

 species is said to have the eye only one-fifth the length of the head, and 

 the adipose fin is one-fourth the total length. The occipital process is 

 said to be covered with a thick skin. In the R. stramiiiea this process is 

 rugose and is covered by a very thin skin, and approaclies quite near to 

 the dorsal plate. From the R. eriarcha E. and E., from the Uraguay 



