1910.] FROM CHRISTMAS ISLAXD. 829 



simple stems, and one, showing traces of a brancli, oceni'red on the 

 surtace of a fragment of millepore. The gonosome is absent, and 

 the characters of tlie liydriinths li.ivc nil Imt disappejired, but tlie 

 perisarc of the trophosome shows the structuies described by 

 Warren. The stolon measures 102yt*, and the hjdrocauli from 

 81 f.1 to lllyK, in diameter, but the unbranched hydrocauli arc 

 very short, less than 2 mm. in height. 

 Locality. Flying- Fish Cove. 



Family P e n N A r i d /E. 



Pennaria distioha Goldfuss {=P. cavolinii Ehrenb.), var. Aus- 

 TRALis Bale. 



*1820. Pennaria disticha Goldfuss, Handb. dar Zooh, iSTurnberi", 

 p. 89. 

 1884. Pennaria aiostralis Bale, Cat. Australian Hydroid Zooph., 



Sydney, p. 45. 

 Several well-preserved colonies of this variety, distinguished 

 from typical P. disticha by the restriction of the annulation of the 

 peduncles to six, or fewer, rings at the base, and by tlie small size 

 of the colonies, were obtained. No gonosome is present, and 

 the specimens are overgrown by seaweed and diatoms, 

 Loccdittj. Flying- Fish Cove. 



Family T u b u l a R i D .?;. 



TUBULARIA CROCEA Agassiz. 



1862. Parypha crocea Agassiz Contr, Nat. Hist. U.S., vol. iv. 

 p. 249. 



A considerable number of specimens of a small Tabularia, witli 

 stems up to 25 mm. high, show the following significant 

 characters. The stems are white, becoming faintly tinged with 

 yellow at the base. They are mostly unbr:vnched, or have a few 

 straggling oftshoots at tha ba.se, and they are marked here and there 

 by groups of faint annulations. Tlie hydranth is translucent, set 

 above a marked dilatation, the lower part of which is protected by 

 thin, wrinkled perisarc, while on the upper portion the ectoderm 

 is markedly thickened, appearing as if it hung downwards from 

 the base of the hydrantli in a short iiap. In this respect, and in 

 the separation of the hydranth cavity from that of the dilation, 

 the structures are similar to those of T. bethce Warren, but the 

 ectoderm of the present specimens is also much thickened at the 

 neck beneath the dilation, and the endoderm lining the dilation 

 does not exhibit the development of elongated cells which Warren 

 describesf. 



In these specimens the oral tentacles number about 1 5 to 1 7, 

 and the proximal tentacles about 18 to 20, set in single whorls. 



* For syiionyiuy see Bedot, Rev, Suisse de Zool., vol. ix. 1901, p. 459. 

 t Warren, Ann. Natal Government Mus., vol. i. 1908, p. 282. 



Proc. Zool. Soc— 1910, No. LIV. 54 



