107. ASPREDO. 269 



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

 middle ; lower jaw with a narrow band of minute villiform 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. 



British, 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, Cuv. 8f Val. xv. p. 439. 



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



Closely allied to A. batrachus. 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. 



Mystus, sp., Artedi, in Seba, iii. p. 86. no. 9. tab. 29. fig. 9. 

 Batrachus, sp., Klein, Miss. Pise. v. p. 86. no. 11. tab. 4. figs. 7 & 8. 

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

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



Lacep. v. p. 78. 

 Silurus hexadactylus, Lacep. v. p. 82. 

 Aspredo sex-cirrnis, Cuv. Sf Val. xv. p. 441 ; Kner, Sitzgsber. Wien. 



Acad. 1855, 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 maxillary, 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 very small. Each intermaxillary 

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

 both patches are separated by a very 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 brownish, marbled with dark brown. 



British and Dutch Guianas. 

 a. Fine specimen. British Guiana. Purchased of Mr. Leadbeater. 

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



c. Fine female specimen. 



d. Adult. 



