DESCRIPTION OF SPECIES 



Suborder CHEILOSTOMATA 

 Aetea sp. 



When examining other spécimens from i3g, I made a note that there was a small 

 pièce of Aetea having ovicells as described in Aetea anguina forma recta ('), but as it has not 

 been found again further particulars cannot be given. There is also, from 986 Tangles VIII, 

 three or four zoœcia of Aetea on the inside of a Brachiopod shell. It has much the appearance 

 of A. recta, but détermination is not possible. 



Catenicella frigida sp. nov. 



(PI. I. figs. la-d) 



Zoarium with usually two single zoœcia, followed by a geminate one, but there are 

 also a few zoœcia attached by short chitinous tubes to the side of other zoœcia. This is 

 not usual in the Catenicellidae, but occurs in Catenicellopsis pusilla Wilson, and Claviporella 

 pulchra MacG. Zoœcia elongate, contracting to the base with a broad vitta on each side, 

 reaching nearly to the base, and a similar short dépression higher up ; along the lower 

 vittae there is a row of pores (5-8). There is an area, below the oral aperture, with three 

 large pores (fenestrae) towards the proximal end, and two small ones near the aperture. 

 The small latéral avicularia are directed outwards, and are situated near the distal end of 

 the zoœcium, but one of the latéral avicularia is often wanting. The oral aperture has the 

 lower edge straight, the length being greater than the breadth ; and there is a raised line 

 above the distal end of the aperture. The secondary zoœcium of the geminate cell is short, 

 and there is usually only one avicularium. The radicle tube starts on the dorsal surface, 

 from close to the proximal end (also sometimes there is a radicle on the front), forming firm 

 bundles. Ovicell unknown. 



This is very closelv allied to the Victorian fossil described by MacGillivray as 

 Catenicella auriculata ( 2 ), and possibly more material might show a range including both forms. 

 The Antarctic spécimens are smaller but relatively longer, while the fossil has a much longer 

 suboral area, with about ten fenestrae; both belong to the Catenicella ventricosa group, and they 

 hâve much similarity with C. sacculata Busk (Chall.). The spécimens are very fragmentary, 

 only consisting of a few zoœcia and although found in four différent bottles, ail are from the 

 same locality. 



Habitat. — Exp. Antarct. Belge. 



N os 617, 621, Ô23, 991, Tangles VIII. Lat. 70 00' S.- Long. 8o°48'W.; 5oo ? mètres ; 

 +0.9 C. 



(1) Linn. Soc. Journ. Zoo!., vol. XXVI, p. 5, pi. I, figs. 1-4. 



(2) MacGillivray, Monogr. of the Tertiary Polyzoa of Victoria. (Trans. Roy. Soc. Vict., vol. IV, iSg5, p. i5, 

 pi. II, fig. 5.) 



