ANTARCTIC BRYOZOA — ROGICK 309 



parallel to the frontal zooecial plane. Its rostral floor is crescentic 

 i(pl. 33,E). No soft or chitinous parts (mandibles and opercula) are 

 present in the zoids. 



, Orifice: The orifice is nearly terminal, at the zoid edge. A short 

 peristome forms a partial collar frontally and laterally. It is a bit 

 taller in front than at the sides. Medially it is notched. The low 

 medium-wide lyrula of the primary orifice is just back of (internal to) 

 ,the peristomial notch. The cardelles are sturdy and placed on the 

 side walls. The primary orifice is well shielded by the peristome. 



OviCELLs: The globose salient ovicell partly overhangs the orifice. 

 It is slightly roughened peripherally and thinner and flatter centrally. 

 A. few pores border the frontal area. Occasional smaller ones may be 

 distributed haphazardly over the thin frontal. The oral border of 

 the ovicell is faintly curved. 



Distribution: The holotype (USNM 11307) is from Station 45 

 and the paratype is from Station 44. The holotype fragment origi- 

 nally measured 8 by 9.5 mm. but subsequently fragmented. The 

 paratype consists of a few loose zoids and a few growing on another 

 bryozoan encrustation. 



Affinities: Smittoidea ornati'pectoralis seems to be related to the 

 fossil Porella concinna which MacGillivray reported and figured 

 (1895, pi. 12, fig. 6) from Australia, but differs from the illustrated 

 specimen in two ways. The avicidarium in MacGillivray 's species 

 is placed much higher in the peristome, widely interrupting the 

 peristomial coUar; and in his species the areolae are few in number 

 and far apart. He mentions (p. 91) that one of his Muddy Creek 

 specimens had very large median avicularia and that the mandible 

 was very large, much expanded inferiorly, and extended half way 

 down the zooecium. 



Andersson (1902, pi. 30, fig. 5, pp. 546-547) describes a Smittia 

 palmata var. sinuosa which has a very large frontal avicularium but 

 which differs in shape from the Antarctic species. His variety 

 further differs from S. ornati'pectoralis in the shape of the secondary 

 orifice, which is almost lemon shaped, and in the greater extent of 

 the ovicell porous plate. 



Smittoidea ornatipectoralis brevior, new subspecies 



I 



Plate 34 



' Diagnosis: Zoarium encrusting. Zooecial frontal gently convex, 

 bordered by areolae and ending at edges in a thin salient rim. Second- 

 ary orifice a low peristome with a wide frontal sinus or interruption. 

 Primary orifice with a low, medium-wide lyrula and two laterally 

 originating heavy blunt cardelles. A small to medium-sized broadly 



