132 PISCES. 



Premnas, Cuv. 



One or two stout spines on the infra-orbital, and the preoperculum 

 dentated.(l) 



PoMACENTRUs, Lacep.(2) 



Preoperculum dentated, operculum unarmed; a single range of 

 trenchant teeth. (3) 



Dascyllus, Cuv. 



The fishes of this genus only differ from those of the preceding one 

 in their teeth, which are very short and crowded (en velours ras).(4) 

 They all inhabit the Indian ocean. 



Glyphisodon, Lacep. 



Operculum and preoperculum entire; a single range of trenchant and 

 generally emarginated teeth. 



They are found in the Atlantic,(5) but the Indian ocean pro- 

 duces many more. (6) 



Some of them are distinguished from the others by numerous 

 spines in the anal. (7) 



Heliasus. 



The opercular pieces of the Glyphisodon and teeth similar to those 



(1) Chaetodon biaculeatus, Bl., 219, 2, which is also the Holocentre Sonnhat, 

 Lacep., IV, 391; and the Luij. trlfcisciatus, Bl., Sclm., 567; and Ksehlreuter, Nov. 

 Com. Petrop., X, viii, 6; Seb., Ill, xxvi, 29, is a variety of it; — Pr. unicolor, Cuv., 

 Seb. Ill, xxvi, 19, which is also the Scorpene aiguillonnde, Lacep. Ill, 268. 



(2) We define them differently from Lacepede, and greatly dimmish their num- 

 ber by divisions. 



(3) CJiaefodon pavo, Bl., 198, 1, which is the Pomacmtre paon, Lacep., and his 

 Holuc. dutcanthe, IV, 338; — Pomacentrus, Quoy et Gaym., Voy. Freycin., pi. 64, 

 f. 2; — P- pundatus, lb., 1; — P. emarginatus, Seb. Ill, xxvi, 26, 27, 28; — the Hoi. 

 negriUon, Lacep. IV, 367. 



(4) Chxtodon aruanus, L., Mus. Ad. Fred. XXXII, Bl., pi. 198, f 2. 



(5) The Jacaraqua, Marcgr., or Chaetod. saxatilis, L., Mus. Ad. Fred., XXVII, 

 3,' which is also the Chxt. marginatus, Bl., 207; and his Ch. mauritii,213, 1; and 

 the Ch. sargo'i'dc, Lac; but it is not tlie Ch. saxatilis, Bl., 206, 2; — Ch. curassao, 

 BL, 212. 



(6) Chaetod. bengalensis, Bl. 213, 2, or Labremacrogastere^ Lacep., Ill, xix, 3; — 

 Gi. melanurus, Cuv., or Lahre 6-bandes, Lac£p., Ill, xix, 2;—Chaet. sordidus, 

 Forsk., or CaJamoia pota, Russel., 85; — Gl. sparoides, Cuv., Lacep., IV, ii, 1;— G/- 

 lachrymatus, Cuv-, Quoy et Gaym., Freycin., pi. 62, f. 7;—Gl. azurcu.t, lb., pi. 64, 

 f. 3; — Gl. uniocellatus, lb., f. 4. 



(7) Chsetod. surafenMs,B\. 217; — Chaetod. maculatus,1M.,427. 



