5'.i. PIMELODUS. 123 



extend on to the basal bone of the dorsal spine. Adipose fin very 

 long, commencing at a short distance from the dorsal. The maxillary 

 barbels reach to, or nearly to, the caudal tin. The length of the head 

 is contained five times and two-thirds in the total (with the caudal) ; 

 the diameter of the eye is one-fourth or one-fifth of the length of the 

 head, and three-fourths of the width of the interorbital space. The 

 upper jaw is shorter than the lower ('?). Dorsal spine very slender ; 

 the ventrals are nearly under the last dorsal ray. Caudal forked, 

 Avith the lower xobe longest. Dorsal fin with the usual white cross- 

 band. {Gill.) 

 Trinidad. 



bb. The maxillary barbels extend to, or nearly to, the origin of the 

 adipose fin. 



16. Pimelodus queleni. 



Pimelodus queleni, Qitou &• Gaim. Vou. Uran. Zuol. p. 228. pi. 49. 



figs. 3 & 4. 

 sellonis, 3Iull. ^ Trosch. Hor. Ichtli. iii. p 2. 



D. 1/6. A. 12. P. 1/8. 



Head covered with thin skin above ; occipital process triangular, 

 much longer than broad, not reaching the basal bone of the dorsal 

 spine. Adipose fin very long, its length being contained twice and 

 two-thirds in the total (without caudal) ; its distance from the dorsal 

 is one-fifth of its own length. The maxillary barbels extend to the 

 origin of the adipose fin, the outer ones of the mandible to the middle 

 of the pectoral. 



The height of the body is one-sixth or rather more than one-sixth 

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

 or somewhat less than one-foiu'th. The lower jaw is but little shorter 

 than the uj^per : the band of intermaxillary teeth eight 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 serrated along both edges, more than half as 

 long as the head. No porus axillaris. The anal fin extends to the 

 vertical from the end of the adipose fin if laid backwards. Caudal 

 fin cleft nearly to the base ; the lower lobe is somewhat the longer, 

 its lengtli being contained five times and a half in the total. Colora- 

 tion uniform ; dorsal fin with a whitish band across its base. 



Brazil. 



a. Half-grown. Erazil. Presented by Lord Stuart. 



17. Pimelodus wuchereri. 

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



Head covered with thick skin above. Adipose fin very long, its 

 length being one-third of the total (without caud;il) ; its distance 

 from the dorsal is two-fifths of its own length. The maxillary bar- 

 bels extend to the end of the dorsal, the outer ones of the mandible 

 to the root of the pectoral. 



