• V.). XIPHOSTOMA. 357 



1. Xiphostoma lucius. 



Hydiocyou lucius, Cm. Mem. Miis. v. p. 359. pi. 26. fig. 8. 

 Xiphostoma lucius, Cuv. Sf- Vol. xxii. p. 350. 



B. 5. D. 9. A. 10. V. 8. L. lat. 106. 



The length of the head is one-foiu'th of the total (with the caudal) ; 

 the uiDper jaw is not produced into a cartilaginous ajipendage ; the 

 anterior margin of the orbit occupies the middle of the length of the 

 head. The dorsal fin corresponds to the middle of the interspace 

 between ventrals and anal. ( Val.) 



Hub. ? 



2. Xiphostoma cuvieri. 



Xiphostoma cuvieri, <^j/,r, Pise. Bras. p. 79. tab. 42; HiiU. 8f Trosch. 

 Hor. Ichth. i. p. 20. tab. 3. fig. 3 ; Cuv. i^- Val. xxii. p. 355 ; Kiier, 

 DenkscJu: Acad Wiss. Wien, 1860, xviii. p. 60. taf. 8. fig. 17. 



oseryi, Casteln. Anini. Amer. Sud, Pois-^. p. 76. pi. 40. fig. 1. 



D. 10. A. 11. V. 8. L. lat. 105. L. transv. 24. 



The length of the head is one-fourth, or more than one-fourth, of 

 the total (without caudal) ; the upper jaw is produced into a carti- 

 laginous appendage ; the toothed portion of the intermaxillary is 

 more than half as long as the head ; the anterior margin of the orbit 

 occupies the middle of the length of the head, the nasal appendage 

 not included. The ventral is inserted immediately before the dorsal. 

 A round black spot at the root of the caudal fin. 



Brazil. 



3. Xiphostoma ocellatum. 



Schombiin/k, Fish. Guiana, i. p. 245. tab. 23 ; C'la: ^- Val. xxii. p. 355 ; 

 Awe/-, benksch: Acad. Wiss. Wien, 1860, xviii. p. 61. taf. 8. fig. 18 

 (head). 



D. 10. A. 11. V. 9. L. lat. 100-110. L. transv. ig?. 



The length of the head is one-fourth of the total (^ath the caudal) ; 

 extremity of the upper jaw -vnth a short cartilaginous ajjpendage ; 

 the entire intei-maxillary bone is only half as long as the head ; an- 

 terior margin of the orbit somewhat before the middle of the length 

 of the head. Dorsal fin nearer to the ventrals than to the anal. A 

 black ocellus on the base of the caudal fin. 



Brazil, Guiana. 



4. Xiphostoma maculatum. 



Guv. Si- Val. xxii. p. 357 ; Castvlii. Aniin. Amer. Sud, Puiss. p. 76. pi. 40. 

 fig. 2. 



D. 10. A. 11. L. lat. 88. 



Snout narrow, pointed, the up])or jaw being produced into an ap- 

 pendage ; the hind part of the dorsal fin is above the anterior anal 

 rays. Vertical fins with blackish spots. 



Amazons. 

 a. River (,'upai. Purchased of Mr. Stevens. 



