26 EXPEDITION ANTARCTIQUE BELGE 



Habitat. ■ — Exp. Antarct. Belge. 



N° 347, Tangles IV. Lat. 71° 18' S.- Long. 88° 02' W. ; 435 met, ; — o.3 C. 



N os 56i, 568, 573, Tangles VII. Lat. 70° 23' S.- Long. 82^47' W. ; 480 met. ; +o.S C. 



N° 924, Tangles V. Lat. 71° i5' S.- Long. 87 3g' W. ; 435 met. ; — 0.2 C. 



N° io32, Tangles IX. Lat. 70 02' S.- Long. 83° 23' W. ; 459 met. ; -f-0.8 C. 



Brettia longa sp. nov. 



(PI. I. figs. 2a, il 



The zoœcium is long, commencing as a narrow tube, which expands at the end to 

 for m the zoœcial chamber. The area occupies the whole of the upper part of the zoœcium 

 and is oval, with a wall sloping inwards to the oval opesium, and at the upper corner of 

 the zoœcium on one side there is a short spine. On the dorsal surface there are, near the 

 distal end, a pair of disks and again be!o\v thèse a smaller pair, besides a pair of small 

 pores on the front of the zoœcial tube. 



The new zoœcia are given off from the dorsal surface of the older ones, and in one 

 case there is a second tube, apparently the lower part of the second zoœcium ; also in another 

 there are tubes, which we must conclude are zoœcial tubes growing from the side of the 

 zoœcium. The walls are more calcareous than in other species of Brettia. It seems closely 

 allied to Brettia cornigera Bush, brought by the Challenger, from the West Indies, but as 

 there are only a few more zoœcia of Brettia longa than those figured, it is impossible, from 

 such fragments, to feel quite certain as to the spécifie position. 



Brettia occurs in the Arctic as B. frigida Waters and B. minima Waters. 



Habitat. — Exp. Antarct. Belge. 



N os 621 and 623, Tangles VIII. Lat. 70 00' S.- Long. 8o° 48' W. ; 5oo ? met.; +0.9 C. 



Bicellaria grandis Busk: 



(PI. I, figs. 6(7, b) 



Bicellaria grandis Busk, Brit. Mus. Cat., p. 42, pi. XLIV : MacGillivrav, Zool. Victoria, décade VI, p. 38, 

 pi. LIX, figs. 2. 3. 



This shows some slight variation in the number and position of the spines but there 

 does not seem to be sufficient reason for separating it from Busk's species. On the digitiform 

 process there are usually three spines, though often only two and the number may occasionally 

 be reduced to one. Further back there are two long articulated spines, and there is a short 

 one from the distal end of the dorsal surface. A new branch arises on the dorsal surface, 

 on the outer side close to the base of the ordinary zoœcium, corresponding in structure 

 with the growth of Bugitla bicornis Busk (PI. I, fig. 46). The radicle grows from the distal 

 end on the dorsal surface, near to the inner short spines, and thèse radicles unité together 

 forming a thick bunclle. Avicularia and ovicells are unknown. 



In Bicellaria the zoœcia are but very slightly attached, there being but one latéral 

 rosette plate and that near the distal end, while between thèse rosette plates the lower 



