BRYOZOA 69 



The avicularia are rare, and upon some spécimens none are seen, for in looking through 

 43 colonies only four were found, also very few ovicells occur. The ovicell is subject to 

 some variation, and the distal projection seen in the ordinary zoœcia is more pronounced 

 in the ovicelligerous zoœcia, and may turn over the aperture, entirely covering it (fig. 5a (prj). 

 To show ail the variations an entire plate would not suffice, but using caméra lucida 

 drawings for the shape and position of the zoœcia and then representing characteristic zoœcia, 

 with ovicells and apertures in différent positions, it is hoped that the varying conditions 

 will be understood, though I must add it is not possible to give an absolutely correct view 

 of the peristomial tube, as seen when looking down it. 



There are two distal rosette plates with numerous pores, and the four latéral plates 

 appear to be very similar, though from the préparations I cannot state the number of pores. 

 Spécimens 562, 610, 5g6 hâve been examined for polypides, but none hâve as yet been found, 

 though there are a few buds. 



This species is closely allied to Smittia (Vincularia) exarata of Reuss ('), and possibly 

 it is that species, but in the fossil it is impossible to see the détails of the aperture. 



Habitat. — Exp. Antarct. Belge. 



N os 562, 5g6, 1028, Tangles VII. Lat. 70 23' S.- Long. 82 47' W. ; 480 met.; +0.8 C. 

 X os 610, 611, 621, 623, 65o, 683, 991, Tangles VIII. Lat. 70° 00' S.- Long. 8o° 48' \Y. ; 

 5oo ? met. ; —0.9 C. 



N° 798, Tangles X. Lat. 70 i5' S.- Long. 84 06' W. ; 369 met.; +0.8 C. 



Smittia directa sp. nov. 



PI. IV, fig. ioa-à 



Zoarium cylindrical, dichotomising, and branching at short intervais, in différent planes. 



The zoœcia are distinctly separaied by thin raised margins, and the sides are nearly 

 straight. The surface is flat or slightly depressed with numerous fairly large pores, two 

 of which near the top are larger than the others. The part by the aperture is raised, bot h 

 in the zoœcium bearing the aperture, and in the one above ; and the peristomial aperture is 

 nearly round, only sometimes showing a slight groove on the proximal edge. Ovicells 



unknown. 



It is only in broken spécimens that the lyrula can be seen, as it is directed downwards at 

 right angles to the axis of the zoœcium (fig. lod). In a few cases there is a pore below 

 the aperture, as in S. gelida nov. when the peristome meets over a sinus, and I was perplexed as 

 to whether this might be the basai part of S. gelida, but this cannot be as both the zoarium 

 and the zoœcia are larger than in the last species, the branching is more fréquent and the 

 surface is flat or depressed, this is always the case in the lower zoœcia, which are blind, 

 having no opening. 



(1) Vincularia exarata Reuss, « Bryoz. von Crosaro ». (Dciik. Akad. Wissensch. Wien, vol. XXIX, p. 276, 

 pi. XXXIV. fig. I.) — Smittia exarata Waters, Quart. Journ. Geo!. Soc., vol. XLVII, p. 22, pi. III, fig. 6. 



