NO. 2 OSBURN: eastern pacific BRYOZOA CHEILOSTOMATA 319 



The ovicell is large, about 0.35 mm in each dimension, hyperstomial, 

 not closed by the operculum, porous and heavily calcified with radiating 

 ridges. 



Hastings lists it from the Galapagos Islands; previously it was known 

 only from the Atlantic, Cape Verde Islands and John Adams Bank. 



Hancock Stations: from 14 stations about the Galapagos Islands, 

 Wenman, Charles, Chatham, Indefatigable and Albemarle Islands ; also 

 at two stations in the Gulf of California, Angel de la Guardia Island, 

 and Raza Island. Shore to more than 100 fms. 



Schizoporella linearis var. inarmata (Hincks), 1884 



Plate 37, figs. 4-5 



Schizoporella linearis form inarmata Hincks, 1884:41. 



S. linearis suhsp. inarmata, Robertson, 1908:291. 



S. linearis var. armata, O'Donoghue, 1923 :36. 



Schizopodrella linearis var. armata, O'Donoghue, 1925 :102 ; 1926 :58. 



Zoarium encrusting in a thin layer, glistening. Zooecia more or less 

 quadrangular and usually very regularly disposed ; 0.40 to 0.50 mm long 

 by 0.30 to 0.40 mm wide ; slightly inflated and distinct except in advanced 

 calcification. The frontal is a tremocyst with numerous small pores, 

 between which there are minute rounded prominences which give the 

 surface a granulated appearance ; a small umbo may be present proximal 

 to the aperture. The peristome is low, thin and smooth, but the frontal 

 wall often forms a low tuberculate wall around it. The aperture, 0.13 

 by 0.13 mm, is nearly round with a well-marked sinus shaped between 

 a U and V; the cardelles are strong. The operculum is thin with a 

 narrow sclerite a little within the border. Small dietellae are present. 

 No avicularia and no spines. 



The ovicell is comparatively large, about 0.30 mm wide, hyper- 

 stomial but somewhat depressed and not closed by the operculum; its 

 surface is similar to that of the frontal. The fertile zooecium has a slightly 

 wider aperture. 



Hincks named this form from the Queen Charlotte Islands, without 

 further data and without description except "totally destitute of avicu- 

 laria. In other respects they agree with the typical form and must be 

 regarded as unarmed variety." Robertson recorded it from Santa Catalina 

 Island, California, without comment. O'Donoghue listed it from numer- 

 ous localities in British Columbia and questioned its status as a variety. 

 It may be added that there are no spines, while these are found in linearis. 

 Compared with a specimen from Scotland, I find no differences except 

 the lack of avicularia and spines. 



