I 



ANTARCTIC BRYOZOA — ROGICK 287 



being clitbridiate (pi. 23,C,D), tbe primary smittinoid (pi. 23,E,F,H). 

 Tbe primary orifice cannot be seen from tbe outside except in damaged 

 • or dissected zoids because of tbe deptb of tbe peristomie (pi. 23,B,E,G). 

 No opercula are in tbe present collection. Tbe small tootblike lyrula 

 and cardelles are firm and sturdy. 



OviCELLs: None bas been found to date. 



Distribution and Ecology: A small amount of old material, 

 including tbe bolotype (USNM 11312), came from Station 44 (lat. 

 65°25' S., long. 101°13' E.). Part of it grew on a reteporid bryo- 

 zoan. In turn, over it grew Lacerna hosteensis, Microporella trinervis, 

 Mucronella crozetensis, Smittoidea ornatipectoralis, Smittina canui, 

 Microporella sp., sponge, and Foraminifera. 



Tbis species bas been previously reported under tbe name of 



Porella malouinensis by Livingstone (1928, pp. 9, 68) from lat. 66°32' 



iS., long. 141°39' E., at 157 fatboms. Vigeland (1952, pi. 3, fig. 1) 



apparently bad the correct Porella malouinensis of Juilien (1888) but 



included Livingstone's above-named species in his synonymy. 



Affinities: Porella malouinensis, as pictured and described by 

 Juilien (1888, p. 57, pi. 3, fig. 6), is a Smittina, with a good-sized 

 elliptical oral avicularium placed centrally in the wide sinus of a large 

 orifice. Its mandible is directed more or less forward. Also, tbe 

 peristomial sinus is wide enough and the avicularium is so close 

 to the edge that the avicularium can be readily seen without tilting 

 the zooecium. The specimen that Livingstone identified and pictured 

 as Porella malouinensis is really Smittina abditavicularis, new species. 

 In S. abditavicularis the sinus is very narrow and the orifice is small 

 and deep; therefore, it is extremely difficult to see the avicularium 

 or even suspect its presence without much specimen-maneuvering 

 and hunting for cross or end sections. Moreover, the avicularium is 

 very small and obliquely directed in the center of the peristomie 

 instead of being turned directly outward. Also it is more oval than 

 rounded. Juilien did not describe the lyrula, cardelles, or shape of 

 the primary orifice. Without such data or without a picture of these 

 parts it is difficult to identify some of the Smittinidae. Finally, 

 JuUien (p. 57) described the P. malouinensis oviceU as hemispherical, 

 granular around the periphery, and bearing a group of punctae on 

 tbe flattened surface. Neither Livingstone's nor the present author's 

 specimens had oviceUs. 



Smittina alticollarita, new species 



Plate 24 



Diagnosis: Zoarium white, encrusting. Zooecial frontal a gently 

 convex, thick, roughly granular tremocyst. Thin salient mural rims. 



350640—56 6 



