BRYOZOA 71 



Smittia gelida sp. nov. 



(PL IV, fig-s. 6a-c) 



Zoarium cylindrical, branched. Zoœcia alternate in linear séries, hexagonal to subovate, 

 divided by distinct raised margins ; surface perforated, in the younger zoœcia raised, in the 

 older ones Hat or depressed. Peristome raised except at the proximal edge, where there is a 

 peristomial sinus, within which the narrow lyrula is seen, situated low down. Sometimes the 

 peristome meets, forming a central pore. The ovicell is globular, but not always much raised, 

 with a few large pores on the surlace. The cylindrical branches grow from a part of the 

 zoarium which is adnate, and has similar zoœcia, though rather wider and more ovate than 

 those of the erect portion. In the preliminary examination the adnate and erect forms were 

 separated, as two species, but spécimens showing the erect form growing out of the adnate 

 one established the identity, which is interesting, as we know of comparativel) r few cases 

 where growth of an erect form out of an adnate one is proved, although it is suspected in 

 several. 



There are ig tentacles as counted in adnate spécimens. Sections of the adnate portion 

 show dark bodies in the tips of the tentacles just as in 5. antardica nov., 5. gelida is much 

 like the fossil from Curdies Creek which I called 5. anceps MacG. ('), but I now consider the 

 détermination was not correct. The fossil has oral avicularia. A close relationship between 

 this and S. antardica nov. is évident, but the zoœcial shape is différent, there are no avicularia, 

 and the lyrula is narrower. 



Habitat. — Exp. Antarct. Belge. 



N os 610, 6i5, 621, Ô23, 65o, 683, 991, Tangles VIII. Lat. 70° oo' S.- Long. 8i°48' W. ; 

 5oo met. ; -f 0.9 C. 



N os 610 and 6i5 only adnate. N os 683 and ggr both erect and adnate. 



Smittia dentata sp. nov. 



(PI. IV, 6g. 3) 



Zoarium incrusting, with zoœcia ovate to hexagonal, having large pores round the border, 

 each pore separated by a short ridge, surface smooth or slightly granular. Oral aperture 

 large, with bidentate lyrula and a cardella at each side. Near the lower corner of the aper- 

 ture, at each side there is a small, tumid avicularium with semicircular mandible. Ovicell 

 unknown. In the gênerai form it much resembles the Mucrondla bicuspis Hincks, but differs 

 in having a row of pores round the border, instead of the few large punctures of the New 

 Zealand spécimens. The fossil S. biincisa Waters from South Australia and Victoria is very 

 closely allied to thèse two, and the Mucrondla serratimargo Ortmann, from Japan has a similar 

 aperture. 



Habitat. — Exp. Antarct. Belge. 



N° 6i5, Tangles MIL Lat. 70 00' S.- Long. 8o° 48' \V. ; 5oo ? met. ; 4-0.9 C. — One 

 pièce only, growing on stone. 



(1) Quart. Journ. Geol. Soc, vol. XXXVII, p. 33/, pi. XVIII, fig. 94. 



