BRYOZOA Sg 



dichotoma d'Orb. (Pal. fr., Crét., p. 685, pi. 744, figs. 1-3), but thèse small spécimens, without 

 ovicells, cannot be determined with certainty. 



Habitat. — Arctic and British. 



Exp. Antarct. Belge. 



N° 3 4 8, Tangles IV. Lat. 710 18' S.- Long. 88" 02' W.; 4 35 met.; — o.3 C. 



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



Stomatopora divergens sp. nov. 



(PI. IX, figs. 6a. b, c) 



The zoarium arises from a discoid zoœcium like the majority of the Cyclostomata, then 

 above this, after one or more zoœcia, two ligulate branches are formed in opposite directions, 

 and at right angles to the primary zoœcium. 



The zoœcia, which are contracted towards the end are alternate, with the ends free, but 

 do not extend over the base of the zoarium, and there is only one zoœcium to a séries. The 

 zoarium is about o.6 mm wide, and the zoœcia are about o.og mm at the end. The punctures 

 are fairly large and distinct on N° 5g6, but less numerous on N° 570. 



The ovicells occur as distinct raised subcircular swellings, about the middle line of the 

 zoarium, and near the centre a short erect, tube projects. In the two ovicells found on N° 570 

 this tube lias the appearance of being a zoœcial tube, passing through the ovicell, and no 

 other opening is seen on the ovicell. The pores on the ovicell are much more fréquent than 

 on the zoœcia. Whether this should be placed with Stomatopora, or Idmonca, may be con- 

 sidered an open question. 



Habitat. — Exp. Antarct. Belge. 



N os 570, 5g6, Tangles VII. Lat. 70° 23' S.- Long. 82° 47' W.; 480 met.; -fo.8 C. 



N° 61g, Tangles MIL Lat. 70° oo' S.- Long. 8o û 48' W.; 5oo ? met.; +o.g C. 



Stomatopora antarctica sp. nov. 



(PI. IX, fig. 10) 



Zoarium uniserial, narrow, with branches at right angles, and usually at long intervais, 

 given off either from about the middle or the upper part of the side of the zoœcium. The 

 zoœcia are long, and the zoœcial chamber is, in spirit spécimens, visible through the finely 

 punctured wall, while at the sides there are two or three parallel lines, dividing the basai 

 portion into narrow tubular spaces. The ends of the zoœcia are erect for a short distance. 

 Long creeping threads of this Stomatopora are found without branches, and one unbranched 

 pièce on a stone is 20 mm long. 



As a rule in Stomatopora the branches are dichotomous, the rectangular growth of this 

 species being unusual ; but it occurs in a few cases, as for instance in the Cenomanian fossil 

 Stomatopora (Alecto) lineans d'Orb. ('), which is very similar to the présent form, though in 

 the fossil the zoœcia are much shorter. 



(1) Pal. franc., Crét., p. 838, pi. 629, figs. 5-S. 



xii R 21 



