ANTARCTIC BRYOZOA — ROGICK 251 



Dvicell opening narrow, arched and placed just above the margin of 

 jts zooecium. 



Colony: Only two fragments, one 8 mm. and the other 10 mm. 

 ong, were found in the U. S. Navy collection. Their breadth varies 

 I'rom 1.079 to 1.479 mm. (average 1.299 mm.). Neither is branched. 

 The two stalks are faintly nodulated. The nodulation consists of a 

 nere pinching in or creasing of the proximal part of the zoids (pi. 

 11, G). The two fragments are too small to give a true picture of the 

 iTequency pattern of nodulation. In some areas, every other trans- 

 lirerse series of zooecia is creased, then follow three to five transverse 

 series with no nodulation. There is no difference in color of the 

 'nodes" and "internodes." 



Zooecia: Thornely did not mention the number of zooecia in each 

 transverse series or on each face, and no measurements were given 

 for the species. In the U. S. Navy specimens there are six zooecia in 

 jsach transverse row, three opening out on one face, three on the 

 other. The zooecia are calcareous, translucent, rather thin-walled 

 ,and of a pale yellowish color. They are hexagonal, with distinctly 

 angular corners and straight sides. Dimensions: length from 0.749 

 to 0.950 mm. (average 0.857 mm.); width from 0.446 to 0.619 mm, 

 [(average 0.533 mm.). Their frontal surface is slightly concave or 

 depressed but especially so just beneath the lower lip (pi. 11,H). 

 Also, the frontal sm'face and the orifice rim are beaded or covered with 

 fine low tubercles placed close together, A thin, salient line outlines 

 the zooecia. Radicles sprout from the front of some zooecia (pi. 

 11,G,I). 



ZooECiAL orifice: The zooecial orifice is located some distance 

 below the uppermost peak of the hexagon, the distance in some 

 cases being almost twice the total length of the orifice. Many of 

 the orifices obliquely placed, some tipped to the right, some to the 

 left, and a few not oblique at all but set symmetrically (pi. 11,G,H). 

 They are crescent shaped, slightly salient, and with beaded rim. 

 The lower lip is thrust upward and forward as if in a pout (pi. 11,1). 

 Immediately beneath it is a depressed area. Because the orifices are 

 closely covered by a bright yellow, translucent to opaque operculum, 

 the interior of the orifices is not clearly visible. In some zoids how- 

 ever, there appears to be a proximal calcareous ledge bearing two 

 condyles. Operculum dimensions: length from 0.101 to 0.122 mm. 

 (average 0.114 mm.); width from 0.187 to 0.216 mm. (average 0.202 

 mm.). The length was measured from the level of the two corners 

 to the highest point in the midline. 



OviCELLs: No oviceUs were seen in the U. S. Navy specimens. 

 However, Thornely (1924, p. 16) gave an adequate picture and de- 

 scription of them. She described them as large, embedded between 



