107. ASPREDO. 2(39 



transverse band of small teeth, both bands being separated in the 

 middle ; lower jaw with a narrow band of minute ATlliform teeth. 

 The length of the head, to the end of the occipital process, is consi- 

 derably less than one-fourth of the total (the caudal fin included). 

 The first dorsal ray and the outer caudal rays sometimes slightly 

 prolonged. 



Eritish, Dutch, and French Guianas. 

 a-c, d. Adult and half-grown. British Guiana. Purchased of Mr. 



Scrivener. 

 e. Adult. British Guiana. Presented by Prof. R. Owen. 

 /. Adult: Cayenne. 

 g,h,i. Adult: stuffed. Surinam. 

 h. Adult: skeleton. 



2. Aspredo sicyephorus. 



Aspredo sicuephorus, Citv. i^- Val. xv. p. -loO. 



D. 5. A. 56. P. 1/6. V. 6. 



Closely allied to A. hatrachus. Barbels eight, as in that species; 



no spines above the snout ; the length of the head, to the end of the 



occipital process, is more than one-fourth of the total (with the caudal). 



Brownish above, with white dots ; anal with black margin. ( Val.) 



Mana. 



3. Aspredo cotylophorus. 



Mvstus, sp., Artidi, ut Seba, iii. p. SG. no. 9. tab. 29. fig. 9. 

 Batrachu.i, sp., Klctii, 3Iiss. Pise. v. p. 86. no. 11. tab. 4. figs. 7 & 8. 

 Aspredo, sp., Gronov. 3Ius. Ichth. i. p. 8. no. 26, and Zoophyl. no. 324. 

 Platystacus cotylephorus, Block, viii. p. 54. taf. 372 ; £1. Schn. p. 372 ; 



Ldcep. v. p. 78. 

 Silurus hexadactylus, Laccp. v. p. 82. 

 Aspredo sex-cirrhis, Cuv. Sj- Val. xv. p. 441 ; Kner, Sitzgsber. Wien. 



Acad. 185.5, xvii. p. 93. 

 spectrum, Gronov. Syst. ed. Gray, p. 137. 



D. 5. A. 57. P. 1/6. V. 6. 



Upper jaw spatulate, moderately broad, and projecting beyond the 

 lower ; barbels six : one belongs to the niaxillaiy, extends to the 

 root of the pectoral, and is dilated at its base, but has no other barbel 

 attached to it ; the second pair of barbels is inserted at the angles of 

 the mouth, and the third at some distance behind the second. Upper 

 part of the snout smooth ; eye veiy small. Each intermaxillary 

 with a patch of villifonn teeth, which is rather broader than long ; 

 both patches are separated by a veiy narrow interspace ; lower jaw 

 with a narrow band of teeth. The length of the head, to the end of 

 the occipital process, is one-fourth of the total (without caudal fin). 

 The first dorsal ray not, the outer ones of the caudal slightly pro- 

 longed. Light broMTiish, marbled with dark bro^^Ti. 



British and Dutch Guianas. 

 n. Fine specimen. British Guiana. Purchased of Mr. Leadbcater. 

 h. Half-grown. Surinam. Purchased of Mr. Frank. 

 <•. Fine female specimen. 

 d. Adult. 



