I 20 



species described below agrees well ; and it seems convenient to place it in D'Orbigxy's genus. 

 It might well have been placed in Stoma/opora, as understood by HlNCKS; but Grkgorv (t. cit., 

 p. 42) has given reasons for restricting this generic appellation to species in which the zooecia 

 are uniserial, as in S. granulata. 



1. Reptotubigera philippsae n. sp. (PI. X, fig. 9). 



Idmonea anstralis (pars), Philipps, 1899, Willey's Zool. Res., Pt. IV, "Polyzoa", pp. 441,449. 



I name this species after Miss E. G. Philipps, who has recorded it from Lifu. It is 

 probably allied to Idmonea raniosa Waters *). 



250. A. Stat. 310. 8°30'S., H9°7'.5E., 73 Metres; sand with a few pieces of dead coral. 



(On an Alcyonarian axis). 

 and (Mus. Zool. Cambridge, Reg. Mar. 1, 1898), Idmonea australis (so determined by Miss 



Philipps), Lifu, Loyalty Islands, A. WiLLEY Coll., Reg. Mar. 1, 1898. 



Zoarium entirely adherent, formed by two or three elongated, strap-like lobes which 

 may diverge from one another at an angle of nearly 180 ; the edges of the lobes forming a 

 basal lamina, marked by porous areas representing closed vestigial zooecia. Lobes nearly 

 semicircular in transverse section, most raised in the middle, but without any angulation in 

 that region. Zooecial series very close together, alternate in the more proximal parts, but 

 becoming nearly opposite at the ends of the lobes. Number of zooecia in a series 3 or 4, 

 less in the proximal parts of the lobes. The two or three zooecia nearest the middle of the 

 lobe are connate, the outermost zooecium usually separate from the others. Peristomes short, 

 completely connate or partially free; curved in the more proximal parts, straight and nearly 

 at right anp/les to the surface of the branch at the distal ends of the lobes. Ovicells infiated, 

 rather broad, but not very distinctly outlined. Ooeciostome a short tube, developed on the 

 proximal side of one of the series of zooecia, near its median end. Ooeciopore directed 

 frontally, elongated transversely and more or less oval. 



The 'Siboga' Collection includes only two specimens of the present species; both from 

 the same Station. The larger, which is represented in fig. 9, measures 9 mm. in total length, 

 and consists of two strap-shaped lobes, closely adherent to the substratum, an Alcyonarian 

 axis, and diverging from one another at an angle of almost 180 . In the oldest part of the 

 colony the zooecia are somewhat smaller than in the more distal parts, and the full number 

 of zooecia in a series is not attained. Some of the zooecia near the centre have long peristomes, 

 which may be free. The series of zooecia are unusually close together. They are at first 

 regularly alternate and the zooecia are curved; but, towards the end of the lobes, where 

 ovicells are present, they become almost opposite; the zooecia being now straight and standing 

 almost at right anodes to the surface. The arrangement of the zooecia in the series has been 

 indicated in the diagnosis. The middle of the branch is the most elevated part, but it is 

 rounded and not angular. 



l) Waters, A. W. 1887, "Tert. Cycl. Bry. New Zealand", Q. J. Geol. Soc, XLIII, p. 339. Miss Jei.ly (1S89, "Syn. Cat. Ree. 

 Mar. Bry.", p. 119) records recent specimens from Stewart Island. 



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