NO. 2 OSBURN: eastern pacific BRYOZOA — CHEILOSTOMATA 419 



Parasmittina alaskensis new species 

 Plate 48, fig. 13 



Zoarium encrusting on a shell, pale yellow, glistening. Zooecia 

 moderate in size, 0.55 to 0.70 mm long by 0.35 to 0.40 mm wide, 

 irregularly ovate, distinct with deep grooves in the young, indistinct 

 with complete calcification. The frontal is a very thick pleurocyst, heavily 

 granulated, a low pointed umbonate process near the aperture ; a single 

 row of conspicuous areolar pores with short ribs between them which 

 do not extend upon the front. The primary aperture is nearly round, 

 0.13 mm wide by 0.12 mm long, straight on the proximal border with 

 a moderate lyrula. The peristome is somewhat elevated all around the 

 aperture, except for a short space on the distal border where there are 

 2 strong but evanescent spines; cardelles wanting. The secondary aper- 

 ture is ovate in form, usually exposing the lyrula. The avicularia are 

 of two kinds; a round or short-ovate one at or near the proximal end, 

 usually immediately distal to the aperture of the preceding zooecium, 

 with a heavy cross-bar and becoming deeply sunk in the crust in older 

 zooecia; the other type is pointed, with a triangular mandible and 

 elevated rostrum, located a little proximal to the aperture, on one or 

 both sides, the mandible directed toward the aperture. 



The most striking characters are the heavily and evenly granulated 

 front, the simple ovate secondary aperture and the round, sunken avicu- 

 larium which is usually in the midline at the extreme proximal end. 



The one colony has no ovicells. 



Type, U. S. Nat. Mus., 11035. 



Type locality. Point Barrow, Alaska, 25 fms, Arctic Research Lab- 

 oratory, G. E. MacGinitie, collector. 



Parasmittina fraseri new species 

 Plate 49, fig. 15 



Zoarium encrusting, small, white and glistening, a very attractive 

 little species. The zooecia are rather small, 0.35 to 0.45 mm long by 

 about 0.26 mm wide ; alternating in series ; younger individuals some- 

 what ventricose and separated by deep grooves, later more nearly flat. 

 Frontal pleurocyst irregularly reticulate over the surface, the areolar 

 pores moderately large with short costae between. Primary aperture 

 small, 0.10 mm wide, rounded, with a very broad lyrula (almost as 

 broad as the aperture) which has a straight border, and with minute 

 cardelles. The lyrula is so hidden by the peristome that it is difficult 



