196 SI LURID-*:. 



compressed, and two-sevenths of the total length (without caudal) ; 

 ventral and anal fins with fleshy base. Caudal slightly emarginate, 

 the upper lobe being rather longer and less obtuse than the lower. 

 A double series of pores along the lateral line, each pore being in the 

 centre of a small round whitish spot. Body deep brown. 

 Para. 



a-c. Fine specimens (7 inches long). River Capin. Purchased of 

 Mr. Stevens. 



6. Auchenipterus ceratophysus. 

 Kner, Sitzysber. Wien. Acad. 1858, xxvi. p. 427. fig. 23. 

 D. 1/5. A. 20. V. 6. 



The bones of the head and neek finely granular, equally convex ; 

 the lower jaw is the longer ; the maxillary barbel extends somewhat 

 beyond the root of the pectoral ; humeral process pointing obliquely 

 upwards. Dorsal spine rather short, serrated in front. Anal fin 

 with fleshy base ; caudal obliquely truncated. Head and fins with 

 brown spots. (Kner.) 



Matogrosso. 



7. Auchenipterus maculosus. 



Auchenipterus maculosus, Cuv. 8f Val. xv. p. 216. 

 immaculatus, Cuv. iSj- Val. xv. p. 218. 



D. 1/6. A. 24. P. 1/7. V. 6. 



The bones of the head and neck granular ; no groove between the 

 frontals, only a small round hole surrounded by bone. The lower 

 jaw is the longer; the anterior mandibulary barbels are nearly half 

 as long as the head ; the humeral process extends backwards beyond 

 the middle of the pectoral spine. Dorsal spine slightly crenulated 

 in front, shorter than that of the pectoral ; the latter is serrated along 

 both edges, rather shorter than the head, and two-ninths of the total 

 length (without caudal). Caudal fin obliquely truncated. Brown, 

 spotted with dark brown ; sometimes uniformly coloured. 



Guiana ; northern Brazil. 



a. Adult. Surinam. Purchased of Mr. Prank. 



h. Large specimen. Essequibo. From Mr. Ehrhardt's Collection. 



8. Auchenipterus galeatus. 



Seba, iii. 29. 7. 



Silurus galeatus, L. Sijst. Nat. i. p. 503. 

 ? Silurus galeatus, Block, taf. 369. fig. 1 ; Bl. Schn. p. 384. 

 Auchenipterus punctatus, Cuv. § Val. xv. p. 219; Kner, Sitzgsber. 

 Wien. Acad. 1858, xxvi. p. 425. 



D. 1/6. A. 24-25. P. 1/7. V. 6. 



The bones of the head and neck minutely granular ; a groove be- 

 tween the frontals, open or only slightly closed in front ; jaws sub- 

 equal in length anteriorly ; the anterior mandibulary barbels half 



