I 



ANTARCTIC BRYOZOA — ROGICK 241 



length and 0.158 to 0.216 mm. (average 0.185 mm.) in width, and is 

 oroadly oval in outline. Part of the ovicell cavity remains hidden 

 oeneath and between the side walls of the neighboring distal zooecia. 

 Since no soft parts were found on the zooecia and ovicells it could not 

 6e determined with certainty if the front of the ovicell was calcareous 

 'or membranous. 



Avicularia: Only a few avicularia were seen and none with mandi- 

 bles in place. They are small, vicarious, and resemble those of 

 Cellariaeforma parvimuralis. The few seen are broadly spindle- 

 shaped to pentagonal, obliquely placed near the distal end of a zooe- 

 cium. The avicularia measure from 0.274 to 0.288 mm. (average 

 0.285 mm.) along the longer diameter and from 0.187 to 0.216 mm. 

 (average 0.196 mm.) along the shorter diameter. 



Types: Holotype, USNM 11245; paratypes, USNM 11246. 



Ecology: The specimens came from Antarctic Stations 44 and 45. 

 No other organisms grew on the colony scraps. 



Cellariaeforma parvimuralis, new species 



Plate 7,C-H 



Diagnosis: Characters as in the genus, plus the following. Zo- 

 oecia in transverse rows of five or six around the longitudinal axis of 

 the branch. Areolation usually rhombic, occasionally tends toward 

 hexagonal. Zooecial orifice very angular, lateral sides diverging 



.proximally. Zooecial frontal surface flattened, the side walls very 

 thin and slightly salient. The cryptocyst is closely tubercled. Pro- 



I nounced cryptocyst ridges and parenthesis lines around the orifice 

 lacking, although some do show very faint cryptocyst elevations, 

 which are deeply curved, parenthesis-like. Zooecial walls quite 



I opaque. The species is so named because of its small, not very high, 



, walls. 



Colony: There are only seven small fragments of this ivory- 

 colored species available. Not one of these is a complete colony. 



, Three erect stalks are held together at the base by a cluster of yellow 

 chitinous rootlets. Although no joints are present in the fragments 



I it is quite possible that the mature or full-length colonies might be 

 jointed. The stalks are cylindrical. Their diameters range from 

 0.792 to 1.138 mm. (average 0.959 mm.). The longest fragment is 

 13 mm. Zooecia occur in transverse series of five or six around the 

 longitudinal axis of a branch, Areolation is rhomboidal, with rhombi 

 with some tendency toward hexagonal in some areas. 



Zooecia: Most of the zooecia are rhombic or diamond shaped but 

 some are 5- or 6-sided, with one or two of the sides very short. The 

 porners are generally sharp, the distal arch a bit more curved than the 



