298 KXPEDITIOX OF THK " ALHATKOSS," 1S99 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 grcnvn 



together. 



Dascyllus aruanus (Linnk). 



GuNTiiEK, Fischc (Icr Siidsee, 1S81, 7, p. -':i."), taf. 124, Kg. B. 

 ChaelodoH aritanuK Linne, Syst. Nat. oil. 10, 17')S, p. 27.5. 



No. 088(il, M. C. Z. 29489, a specimen 2§ inches long from .laluit, ^Marshall 

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

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

 Islands. 



Dascyllus trimaculatus (Kippell). 



CuviER & V.iLENciENNEs, Hist. Xal. I'oi.-i;^., ISoO, 5, ]). 330 (441). Gt'NTHER, Fisclu' (Icr Siidsco, 

 1881, 7, p. 2.35. 



Pomacttdrnx hiincridfitiis Hi-i'in;i.i„ .\ll:i.>i. 1S2S. p. 3!l. lul. S, lig. 3.' 



No. 08859, 4i inches long from .laluit, Marshall Islands. No. 09029, 

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



It is possible that D. albisclla (Jill 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 ciuite 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 

 I), albisclla, but believe that as the fish becomes larger, the spots are smaller, 

 and gradually disappear. In the .specimen of J). Iriinaciilatus 4| inches long, 

 the spot has alnost entirely disappeared. 



Dascyllus pomacentroides, sp. nov. 



I'hilr ■',, Jiiiiur I. 



Type No. 05812 U. S. N. AL, (Field No. 0S879), 22 inches long from Tari- 

 tari, Gilbert Islands. 



General foi'in of a I'oniaccntrus. 



'The name I'omaccidrus trimaculatus Ciivior & ValorK'icnncs (Hist. Nat. Poiss., 1830, 6, p. 320, 

 (441)) is preoccupied by t'omticcntTua Irimaculalua Rii|)ppll (1828). For the fish named Pomctccntrus 

 trimaculatus by Cuvier and Vulencienne.'; we propose the name I'nmaccntnis dorsomnculdtus. 



