130 SILUKIDJE. 



29. Pimelodus cinerascens. 

 Pinielodus cinerascens, Giinth. Proc. Zool. Soc. 1 860, p. 237. pi. 10. fig. A. 

 B. 7. D. 1/6. A. 13. P. 1/9. 



Head covered with soft skin above ; occipital process triangular, 

 short. Adipose fin long, two-sevenths of the total length (without 

 caudal) ; its distance from the dorsal is nearly one-fourth of its 

 length. The maxiUary barbels extend nearly to the origin of the 

 adipose fin, the outer ones of the mandible beyond the root of the 

 pectoral. 



The height of the body is rather less than one-fifth of the total 

 length (without caudal), the length of the head one-fourth. Jaws 

 subequal in length ; the baud of intermaxillary teeth is five or six times 

 as broad as long. The diameter of the eye is two-fifths of the width 

 of the interorbital space. Dorsal fin with the spine very feeble, as 

 high as long. Pectoral spine less than half as long as the head. A 

 minute porus axillaris. The anal fin extends to the vertical fi'om 

 the adipose fin if laid backwards. 



Guayaquil and Esmeraldas. 

 a, b. Types of the species. Piu'chased of Mr. Fraser. 

 c. Adult. South America. Presented by Sir R. Schomburgk. 



30. Pimelodus foina. 



Pimelodus foina, Milll. ^- Trosch. Hor. Ichth. iii. p. 5. 

 B. 6. D. 1/6. A. 11. P. 1/8. 



Head covered with soft skin ; occipital process very short. Tlie 

 adipose fin commences behind the end of the ventrals, and is twice 

 as long as the dorsal. The maxillary barbels extend to the end of 

 the pectorals, the outer ones of the mandible to their root. 



The length of the head is less than one-fifth of the total (with the 

 caudal). The upper jaw is rather the longer. The eyes occupy the 

 middle of the head ; their diameter equals the space between them, 

 but is twice the width of the osseous part of the interorbital space. 

 Poiiis axillaris minute. Upper lobe of the caudal fin longer than 

 the lower ; pectoral spine strongly serrated. (J/. ^ T.) 



Guiana. 



31. Pimelodus salvini. 

 D. 1/6. A. 11. P. 1/8. 



Head covered with soft skin above ; occipital process short, tri- 

 angular. Adipose fin long, one-fourth of the total length (without 

 caudal) ; its distance from the dorsal is three-foui'ths of its length. 

 The maxillaiy barbels extend not quite to the extremity of the 

 pectoral, the outer ones of the mandible not quite to the root of the 

 pectoral. 



The height of the body is one-sixth of the total length (without 

 caudal), the length of the head one-fifth. Jaws nearly equal in 

 length ; the band of intermaxillary teeth is about six times as broad 



