BRYOZOA b3 



the operculum, which is nearly round, and has the proximal part thickened and this fits into 

 a wide sinus ; the muscular attachments are placed high up, not near the edge of the operculum. 

 The ovicell is depressed having a sunk plain area. The latéral denticles as seen from the 

 interior are shown in fig. 12b. 



Habitat. — Exp. Antarct. Belge. 



N° 332, Tangles IV. Lat. 71° 18' S.- Long. 83° 02' W. ; 435 met. ; — o.3 C. 



Cyclicopora polaris sp. nov. 



(PI. III, figs. 5<i-/) 



This occurs both adnate and bilaminate, from the same locality. The zoœcia in the 

 bilaminate spécimen are oblong, slightly raised, surface smooth, with a row of pores round 

 the border, from which there are irregular suture-like Unes and a similar médian Une. In the 

 adnate spécimen the zoœcia are broader, and may be called subhexagonal to broadly ovate, 

 and above the oral aperture there are 4 spines. 



The oral aperture is wide, nearly round, with a very wide sinus. In some cases there 

 are two small projections of the calcareous wall over the ends of the sinus. The operculum 

 has a broad thickened border, reminding us of the opercula of some Membranipora, such as 

 M. tenuirostris Hincks ('). The distal rosette plates are small and numerous, placed near the 

 basai wall. The latéral plates are very large, with several pores, and are nearer to the 

 frontal wall than to the basai. There usually seem to be four latéral plates. 



This species recalls the Arctic Pseudoflustra palmata Sars, and in the présent form the 

 rosette plates more nearlv approach to the Flustra type than they do in the Arctic species. 

 The entirely separable operculum brings it near to species named Schizoporella. 



Habitat. — Exp. Antarct. Belge. 



N os 991 and 623, Tangles VIII. Lat. 70 00' S.- Long. 8o° 48' W. ; 5oo ? met. ; +o.g C. 



Hippothoa divaricata Lamx. 



(PI. VII, fig. 3) 



Hippothoa divaricata Lamx , Expos, méth., p. 82, pi. LXXX, figs. i5, 16. 

 For sj'nonyms see Miss Jelly's Catalogue. 



This is about twice the size of H. distans MacG., and in the Antarctic spécimens each 

 zoœcium starts from the previous one without any caudate « prolongation ». There are some 

 broken clown ovicells, on spécimen 5g6, which are raised at the end of the zoœcia, and both 

 thèse ovicelligerous zoœcia and the ordinary zoœcia are the same size. The figure is a 

 restoration as there are no perfect ovicells. The H . dispersa of Hagenow from the chalk is 

 so similar that perhaps they should be united. 



Habitat. — Arctic seas ; British and French seas ; Mediterranean ; Azores ; between 

 Fayal and Pico (Atlantic) ; Challenger Station i35, Tristan d'Acunha (60-1000 fathoms); Gulf 



(1) See, Observations on Membraniporidse. (Linn. Soc. Journ. Zoo!., vol. XXYI, pi. 47, fig. 7. 



