I 



ANTARCTIC BRYOZOA — ROGICK 301 



thyi'ostome somewhat pyriform with a rounded sinus below; a quad- 

 rate median denticle, having in front a small avicularium within the 

 lower edge of the peristome. Ooecia small, rounded, subimmersed in 

 the zooecium above." His oviccll apparently is imperforate (pi. 12, 

 fig. 19) or, at most, provided with only occasional pores (if three 

 shaded spots on the sketch can be interpreted as pores). He also 

 omits mention of the shape of the avicularium and mandible and gives 

 no measurements. 



The Antarctic specimens are in closer agreement with the Australian 

 fossil form than with recent species. Six recent species with which it 

 might be confused because of the ovicell or possibly other features 

 are Porella concinna (Osburn, 1910, pi. 27, fig. 67a; cf. comment in his 

 1933 paper, p. 46, on this species), Porella purpurea (Canu and 

 Bassler, 1929, pi. 43, fig. 1), Schizoporella perforata (Canu and Bassler, 

 1929, pi. 35, fig. 9), Smittina bella (Osburn, 1952, pi. 47, fig. 5), Smittina 

 novanglia (Osburn, 1933, pi. 13, figs. 7, 8), and Stomachetosella sinuosa 

 (Osburn, 1952, pi. 34, fig. 3). 



Accounts of two other species gave the writer much difficulty during 

 the identification of S. ordinata. They are Smittia graciosa Busk 

 (1884, p. 154, pi. 22, fig. 13) and Porella concinna Hincks (1880, pp. 

 323-326, pi. 46, figs. 7, 9, var, gracilis). Busk's S. graciosa sample 

 was without ovicells and their absence in his description was a stum- 

 bhng block. Hincks' P. concinna is an assemblage of several species 

 that are impossible to sort out without adding further confusion. 



Genus Sinittinella Canu and Bassler, 1934 



Smittinella Canu and Bassler, in Bassler, 1934, p. 408 (genus defined). — Bassler, 

 1935, p. 202; 1953, p. G209.— Brown, 1952, p. 333. 



Remarks: Canu and Bassler erected the genus for those species of 

 Smittina having a tremocyst and a "deep vertical proximal sinus of the 

 peristomice which is covered by the peristome which is thus pierced by 

 a spiramen" (Bassler, 1953, p. G209). Brown modifies the description 

 somewhat by stating that the sinus is not always cut off or occluded 

 by the growth of the lateral denticles. However, he believes in 

 retention of the genus because of the deep shaftlike sinus between the 

 primary and secondary orifices and because of the absence of frontal 

 avicularia from the sinus. Eschara tatei Tenison- Woods (1877, p. 149, 

 fig. 15) is given as the genotype by both Bassler and Brown. 



It is with some hesitancy that the Antarctic specimen is put in this 

 genus. However, in view of its deep, well defined peristomial groove 

 and its lower, well hidden lyrula and primary orifice (and to date the 

 absence of any positive avicularium) it was thought practical to list 

 it as a Smittinella. 



