NO. 2 OSBURN: eastern pacific BRYOZOA — CHEILOSTOMATA 415 



Parasmittina spathulata (Smitt), 1873 

 Plate 49, figs. 12-14 



Escharella Jacotini var. spathulata Smitt, 1873 :60. 



Smittina trispinosa var. spathulata, Osburn, 1914:208 ; 1927 :29, 



(spathulosa, by error) ; 1940 :435. 

 Smittina trispinosa spathulata, Canu and Bassler, 1928:114. 



Zoarium encrusting, usually in a flat smooth layer, white and shining. 

 Zooecia moderately large, 0.55 to 0.75 mm long by 0.40 to 0.50 mm wide, 

 indistinct but sometimes there is a low separating line ; the front nearly 

 flat, a pleurocyst with small shining granules ; areolar pores of moderate 

 size. The primary aperture is slightly longer than wide, 0.14 mm long 

 by 0.12 mm wide; the rather narrow lyrula always visible, the cardelles 

 larger than usual in the genus. The peristome is limited to a distinct 

 lappet on each side. The avicularia are usually spatulate or oval, but 

 may be ligulate or more rarely pointed, variously located, and usually 

 directed proximally; sometimes there is a large spatulate avicularium at 

 one side of the aperture directed proximally. 



The ovicell is round, about 0.26 mm wide, moderately prominent, 

 with a few rather large pores; the peristome connects with it and may 

 be continued across the border of the orifice ; in older stages the pleurocyst 

 of the succeeding zooecium may form a basal collar and may even cover 

 a considerable portion of the ovicell. 



It is an abundant form in the Gulf of Mexico and the Caribbean 

 Sea and apparently has not been reported elsewhere. The S. reticulata var. 

 spathulata of MacGillivray, 1882:135, is evidently a different species. 

 I believe the characters are sufficiently different to warrant its elevation 

 to specific rank, especially on the basis of the elongate primary aperture 

 and the nature of the secondary aperture. 



Hancock Stations: 55-33, Charles Island; 143-34, Wenman Island; 

 155-34, Albemarle Island, and 201-34, Hood Island, all from the Gala- 

 pagos Islands. 25 to 100 fms. 



Parasmittina calif ornica (Robertson), 1908 

 Plate 51, figs. 8-11 



Mucronella californica Robertson, 1908:308. 



Zoarium encrusting, rather coarse. Zooecia moderately large, averag- 

 ing about 0.60 mm long by 0.40 mm wide, irregularly quadrangular, 

 distinct with rather deep grooves. The front wall is heavily calcified; 

 it has somewhat the appearance of a tremocyst with a small number of 

 large infundibuliform pores similar in size to the areolar pores, but the 



