66 EXPÉDITION ANTARCTIQUE BELGE 



also in sinuosa the proximal border of the operculum curves upwards, while in the smaller 

 operculum of P. palmata it curves dovvnvvards, and the operculum of sinuosa lias a broad 

 band to the distal border. The différences in there being a denticle in one case, and the 

 opercula being of quite a différent character are considérable, and would indicate that sinuosa 

 may fall into Smittia, whereas P. palmata, in spite of various similarities in appearance, 

 does not apparently bclong to this genus. Smittia antarctica, besides being more strongly 

 calcified than sinuosa, has larger zoœcia with pores over nearly the whole of the surface, 

 whereas in palmata and sinuosa they are close to the border. 



The relationship of thèse three species is certainly puzzling, but the S. antarctica is 

 a very distinct species, apparently having some points of resemblance with the Smittia sinuosa 

 Andersson, which in spite of great similarity of gênerai appearance is found on examination 

 of the minute characters to differ very considerably from P. palmata. 



There is from Cape Horn a bilaminate species nearly allied to S. antarctica in which 

 the peristome is not cleft, but at the base of the peristome there is a large pore just above 

 the avicularium, and the shape of the avicularium is the same as that of antarctica. In 

 some cases, however the front of the zocecium is inflated by an avicularian chamber with 

 a wide and short mandible, a short arc of a circle forming the distal end of the mandible. 

 The ovicell has a few large pores. This species will shortlv be described. 



Haiutat. — Exp. Antarct. Belge. 



N° s 618, 619, 683, ggi, Tangles VIII. Lat. 70^00' S.- Long. 8o° 48' W. ; 5oo ? met.; 

 +0.9 C. 



Smittia conspicua sp. nov. (') 



(PI. IV, fig. 3) 



Zoarium adnate, with irregularly ovate to hexagonal zoœcia, which in the older parts 

 are almost fiât. There is a row of large pores round the border, and the peristome, which 

 is much raised on each side, has a subtriangular opening, and within it there is a broad 

 lyrula directed downwards. There are frequently two pores below the aperture. On the 

 front of the zoœcium, and on a level with the surface, but not close up to the aperture, 

 there is a broad oval avicularium. Ovicell unknown. 



This is like S. Landsborovii Johnst. in most points, but differs in having the avicu- 

 larium at a distance from the peristome. This is called conspicua from its gênerai resemblance to 

 Schizoporella inconspicua of Hixcks, but why he gave the name iuconspicua is not clear. 



Habitat. — Exp. Antarct. Belge. 



N° 373, Tangles IV. Lat. 71° 18' S.- Long. 88 û 02' W. ; 435 met. ; — o.3 C. 



N ÙS 6i5, 683, Tangles VIII. Lat. 70 00' S.- Long. 80" 48' W. ; 5oo ? met. ; 4-0.8 C. 



(1) This is ver}' similar to the S. cnsifcra, just described by Calvet and Jullien in « Bryozoaires pro- 

 venant des campagnes de I'Hirondelle », 1903, pp. 102 and 14g, pi. XII, fig. 4, and pi. XVII, fig. 5. The spécimens 

 from the Azores are however much smaller and havc large granulations whereas the surface of the Antarctic 

 spécimens are nearly smooth. The S. ensifcra is no doubt the 5. ophidiana Waters from the Mediterranean. 



