1881.] THK SURVEY OF H.M.S. 'aLERT.' 105 



Sertularia fusiformis, Button? (aon Hincks). 



Sertularia fusiformis, Huttoii, Trans. N.Z. Inst. v. p. 257 ; 

 Coughtrey, Trans. N.Z. Inst. vii. p. 285, pi. xx. figs. 21-23. 



This species appears to be represented by four specimens. The 

 growth is very strong, and the calicles large ('425 millim. in diameter 

 at their middle); but they should be described as quadridentate, 

 though the interior and exterior teeth are very short. The crest, 

 described by Coughtrey on the uppersideof the gonangium.ishere, at 

 any rate, a tube which opens in the side of the gonangium. This is 

 certainly not the species assigned to Hutton's species by Allman 

 (Journ. Linn. Soc. xii. p. 263) under the name of S. episcopus. 



Hub. Trinidad Channel, S.W. Chili, 0-30 fathoms, on coral &c. 



HyDROCORALLINjE. 



Labiopora ANTARCTICA, Gray. 



Porella antarctica. Gray, Ann. & Mag. Nat. Hist. ser. 4, ix. 

 p. 482 ; P. Z. S. 1872, p. 746, pi. Ixiv. fig. 4. 



Labiopora^ antarctica, Moseley, Phil. Trans. 1878, pt. ii. p. 476, 

 pi. XXXV. fig. 5. 



A spirit specimen, the first obtained. It differs from the type 

 specimen somewhat in habit. Instead of originating by a very broad 

 stout stem, giving off stout branches which branch into rapidly 

 tapering pointed twigs, the frond commences to branch almost at its 

 base, the branches being cylindrical and only about half the diameter 

 of those of the type specimen, which is of about the same size; hence 

 their terminal divisions taper much less. The lips of the " narifonn 

 projections " are, as a rule, thicker than in the other case ; and 

 hence their contained pores are scarcely visible to the naked eye. 

 The specimen, which was obtained on the 29th of March, is well 

 provided with ampullae (absent in the type specimen), about one 

 millim. in diameter, projecting as low domes between the nariform 

 projections over the greater part of the branches, some having 

 already burst. The stock would therefore appear to he female ; but 

 examination of decalcified fragments failed to detect generative 

 organs with certainty. The ccenosarcal canals are from "035 to '07 

 niiUim. in diameter ; the meshes between them vary from the former 

 diameter to about '14 millim. 



Eab. Trinidad Channel, S.W. Chili, 30 fathoms (coated with 

 Cellepora, Sertularians, &c.). (The type specimen was from a bank 

 to the east of Tierra del Fuego.) 



' Characters of the Genus Labiopora. — With Mr. Moseley's concurrence, 

 I propose that the distinctive characters of the dactylopores of his genus should 

 be restated as follows :— " Dactylopores devoid of styles ; two kinds present, the 

 one opening on the general surface of the coenosteum, the other within special 

 areas bounded hy nariform lips." This change is necessitated by the discovery 

 of the following new species. The term "few" should be omitted from the 

 description of the branches, and also the statement that the nariform projections 

 are inclined towards the tips of the branches and have their rounded margins 

 on this side. 



