298 EXPEDITION OF THE "ALBATROSS," 1899-1900. 



(05859) has dorsal XII, 1, 12; anal 10, the single anal spine has the appearance 

 of two spines grown together. It has perhaps been broken and then grown 

 together. 



Dascyllus aruanus (Linne). 



GuNTHER, Fische der Slidsee, 1881, 7, p. 235, taf. 124, fig. B. 

 Chaelodon aruanus Linne, Syst. Nat. ed. 10, 17.58, p. 275. 



No. 08861, M. C. Z. 29489, a specimen 2g inches long from Jaluit, Marshall 

 Islands. No. 05876, two specimens, ll and 2i inches long from Fakarava, 

 Paumotu Islands. One specimen, I2 inches long from Papeete, Tahiti, Society 

 Islands. 



Dascyllus trimaculatus (RCppell). 



CuviER & V.\LENciENNES, Hist. Nat. Poiss., 1830, 5, ]). 330 (441). Gunther, Fisehe der Sudsce, 

 1881, 7, p. 235. 



Pomacentrus Irimnculatus Ruppell, Atlas, 1828, p. 39. taf. 8, fig. 3.' 



No. 08859, 4t inches long from Jaluit, Marshall Islands. No. 09029, 

 M. C. Z. 29397, li inches long from Suva, Fiji Islands. 



It is possible that D. albisella Gill from Hawaii is the same as this species. 

 The white bar (which is the only character separating the species) in the Hawai- 

 ian specimens is quite large in the small examples (1 inch) and becomes gradually 

 smaller in larger examples ; in a 2-inch example it extends only half as far down 

 on the body as in the small (1-inch) example; we have no larger specimens of 

 D. albisella, but believe that as the fish becomes larger, the spots are smaller, 

 and gradually disappear. In the specimen of D. trimaculatus 4| inches long, 

 the spot has alnost entirely disappeared. 



Dascyllus pomacentroides, sp. nov. 

 I'Idtr .), fiijurc 1. 



Type No. 65812 U. S. N. M., (Field No. 08879), 2\ inches long from Tari- 

 tari, Gilbert Islands. 



General form of a Pomacentrus. 



'The name Pomac.i-ntrus triinaculatufs Cuvier & Valenciennes (Hi.st. Nat. Poiss., 1830, 6, p. 320, 

 (441)J is preoccupied by Pomacrnlrun trimaculalus Riippell (1828). For the fish named Pomacoilrus 

 trimaculatus by Cuvier and Valenciennes we propose the name Pomacentrus dorsomaculatus. 



