GYMNETRES. PTERACLINiE. 25? 



Aspisurus Lac. Snout contracted, produced, and some- 

 what tubidar ; dorsal spines strong and remote ; 

 caudal fin small, truncate, or slightly lunate. 

 A. Lamarckii. Frey. Atlas, pi. 63, fig. 1. 



Prionurus proper. General aspect of Aspisurus, but 

 the dorsal has an advancing spine ; the caudal spines 

 fixed ; the tail small and slightly lunate. 



P. microlepidotus Lac. Cuv. v. pi. 292. 



Naseus Cuv, 



(fig- 76.) 



General as- 

 pect of Pri- 

 onurus, but 

 the front is 



prolonged into a horizontal horn ; the caudal spines 

 are fixed, and the teeth conical ; ventral fins with only 

 a few soft rays. 



N. fronticornis Cuv. (fig. *76.) 



Priodon. General shape and teeth of Acanthurus : 

 the skin coriaceous ; but the tail is unarmed, and the 

 ventrals like Naseus. 



P. annularis. Cuv. and Val. pL 294. 



AxiNURUs Cuv. Body ovate, coriaceous ; belly very 

 short; tail with a single square, sharp, and fixed 

 plate j caudal fin lunate ; ventral fins very small. 

 Axinurus thynnoides. Cuv. pi. 295. 



Tribe III, GYMNETRES. The Riband-fish. 



Body very long, excessively thin ; pectoral fin minute ; 

 head large, truncate ; eyes very large ; mouth nearly 

 vertical. * 



1. SuBFAM. PTERACLIN.E. 

 Dorsal and anal fins excessively broad. 

 Pteracles. General shape of Astrodermus, but the 



* The primary divisions are mostly representatives of families. 

 VOL. II. S 



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