NO. 2 OSBURN: eastern pacific BRYOZOA CHEILOSTOMATA 315 



Pachyegis brunnea (Hincks), 1889 

 Plate 33, figs. 9-11 



Monoporella brunnea Hincks, 1889:16. 



Zoarium encrusting, yellowish-brown. The zooecia are smaller than 

 in the other species, 0.60 to 0.80 mm long by 0.30 to 0.45 mm wide. 

 On the removal of the thick ectocyst the frontal is shining white, slightly 

 granulated, with large, funnel-shaped pores, strongly arched and sepa- 

 rated by deep grooves. Proximal to the aperture but not obscuring it is 

 a low, rounded or pointed umbo, which usually has a membranous area 

 on its distal side. A minute rounded suboral avicularium is occasionally 

 present in the midline at the base of the umbonate process. The primary 

 aperture is somewhat more than a semicircle, the proximal border 

 straight; the peristome thin, surrounded laterally and distally by a low 

 fold of the frontal which usually does not fuse with it. The operculum, 

 like the other species of the genus, has on either side a strong, straight 

 sclerite extending forward, not reaching the distal end and removed 

 from the border. No spines, no dietellae. 



The ovicell has not been observed. 



Described by Hincks from the Queen Charlotte Islands. Also in 

 the writer's possession is a specimen labeled "Virago Sound, Queen Char- 

 lotte Is., 8 to 15 fms, G. M. Dawson, 1878"; this is no doubt a part of 

 the material from which Hincks drew his description. 



Canoe Bay, southern Alaska, one colony collected by the U. S. 

 Alaska Crab Investigation, Sta. 26-40, at 100 fms. Also at Point Barrow, 

 Alaska, 16 to 80 fms. 



The Schizoporellidae, sens lat. 



The "family," as constituted by Jullien in 1903, included numerous 

 genera with a sinus in the proximal border of the aperture, which have 

 now been assigned to other families, e.g. Hippothoa, Posterula, Masti- 

 gophora, etc. Canu and Bassler in 1923, after the removal of several 

 genera, separated the remaining ones under the family "Escharellidae" 

 into four groups, the Schizoporellae, Microporellae, Hippoporae and 

 Peristomellae. Still later Bassler, 1935, accepted the family Schizo- 

 porellidae (as restricted by Levinsen, 1909) and gave the groups sub- 

 family status, Schizoporellinae, Hippoporinae, Exochellinae (Peristo- 

 mellae) and Microporellinae. 



By agreement with Dr. Bassler I am now elevating these subfamilies 

 to family status on the following characters: 



