39. XIPHOSTOMA. 357 



1. Xiphostoma lucius. 



Hydrocyon lucius, Cuv. Mem. Mus. v. p. 359. pi. 26. fig. 3. 

 Xiphostoma lucius, Cuv. <$• Val. xxii. p. 350. 



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



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

 the upper jaw is not produced into a cartilaginous appendage ; 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.) 



Hah. ? 



2. Xiphostoma cuvieri. 



Xiphostoma cuvieri, Spiv, Pise. Bras. p. 79. tab. 42 ; MiiU. Sf Trosch. 

 Hor. Ichth. i. p. 20. tab. 3. fig. 3 ; Cuv. # Val. xxii. p. 355 ; Xner, 

 Denkschr. Acad. Wiss. Wkn, 1860, xviii. p. 60. taf. 8. fig. 17. 



oseryi, Casteln. Anim. Amer. Sud, Poiss. 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. 



Schomburgk, Fish. Guiana, i. p. 245. tab. 23 ; Cuv. 8f Val. xxii. p. 355 ; 

 Kner, Denkschr. Acad. Wiss. Wien, 1860, xviii. p. 61 . taf. 8. fig. 18 

 (head). 



D. 10. A. 11. V. 9. L. lat. 106-110. L. transv ^ 



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

 extremity of the upper jaw with a short cartilaginous appendage ; 

 the entire intermaxillary 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. 



Cuv. ty Val. xxii. p. 357 ; Casteln. Anim. Amer. Sud, Poiss. p. 76. pi. 40. 

 fig. 2. 



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



Snout narrow, pointed, the upper jaw being produced into an ap- 

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

 rays. Vertical fins with blackish spots. 



Amazons. 

 a. River Cupai Vurchased of Mr. Stevens. 



