﻿2 ARKIV FÖR ZOOLOGI. BAND 4. N:0 19. 



first dorsal ray; the second branched ray is the longest. 

 Dorsal spine smooth, with the tip not pungent, leathery; 

 the height of the fin greater than its base; ventral spineless, 

 not reaching to the anal and beginning just behind the ver- 

 tical from the base of the last dorsal ray; adipose large, its 

 origin beyond and its end behind the anal fin; anal ele- 

 vated, rounded; caudal lobed, the upper lobe the greater; 

 lateral line present. Colour ochraceous yellow on sides; upper 

 parts, maxillary barbels, upper side of the pectoral and ven- 

 tral rays, anal and caudal rays and lateral line, bluish gray; 

 isthmus lemon yellow ; belly white; sometimes the gray colour 

 is more expanded, sometimes the ochraceous yellow is almost 

 uniform in the whole body. In the living fish there is a 

 golden dot on the opercular limb and the peritoneum is 

 golden-silvery shining. 



The longest specimen recorded 155 mm. 



The teeth are distributed in a premaxillary and a 

 mandibulary band, as in the genera Rhamdia or Pimelodus. 

 The heart is very small, well protected by the anterior 

 peritoneal fold. The stomacb is of the syphonal type; the 

 intestinal tract has moderate circumvolutions ; in a female 

 specimen dissected, the ovarian sacs lay in the upper parts 

 of the caudal side of the abdominal cavity, and had ripe 

 eggs, almost 1 mm. in diameter. Air-bladder well developed, 

 reniform, lying attached to the expanded lateral process of 

 the anterior vertebrae, behind the head. The kidney has 

 its anterior part bi-lobed, crescentiform, lying just behind the 

 air-bladder; the posterior part follows the rachisin the me- 

 dian hne; the ureters are swoUen near the urogenital papilla. 

 The whole skin is provided with cyathiform depressions 

 more numerous on the head, jointly the muciferous pores. 



This very interesting fish was found by the Brazilian 

 chemist Mr. Richard Krone, in the waters of the »Caverna 

 das Areias» (Sands' Cave) of the subterraneous course of the 

 »Ribeiräo das Areias» (Sands' River) tributary of the Ipo- 

 ranga River, at S. Paulo, Brazil. 



Mr. Krone tells me : ^ »It is amusing to see this animal, 

 the meekness of which, when attracted by the bait is surpri- 

 sing; it follows the hook to the surface of the water, or even 



^ In litteriKS. 



