NO. 1 OSBURN : EASTERN PACIFIC BRYOZOA CHEILOSTOMATA 163 



Genus GORYNOPORELLA Hincks, 1888 



The zoarium is uniserial, slender and branched dichotomously. Zo- 

 oecia all facing the same direction, more or less regular in form, elongate, 

 the proximal half tubular, the terminal half somewhat expanded ; opesia 

 occupying about half of the zooecial length. Each individual arises from 

 the dorsum of the preceding one near its end. Avicularia buguloid. Ooecia 

 globose. Radicles arising on the side near the distal end. Genotype, C. 

 tenuis Hincks, \S8S:215. 



Gorynoporella spinosa Robertson, 1905 

 Plate 24, figs, 9 and 10 

 Gorynoporella spinosa Robertson, 1905 :284. 

 Gorynoporella spinosa, O'Donoghue, 1922:23. 



The zooecia are slender and elongate (0.50 to 0.65 mm long by about 

 0.20 mm wide), expanding from the narrow tubular base rather regu- 

 larly to the distal end. Opesia long-ovate, narrower at the proximal end, 

 surrounded by a slightly raised thin rim which usually bears three small 

 terminal spines, one median and one at each corner; the cryptocyst is 

 not evident. Avicularium (about 0.22 mm long) stout, on a very short 

 pedicel, the point of the beak strongly decurved. Ooecia prominent, glob- 

 ose, with a few longitudinal striae. 



The species is much like the genotype, G. tenuis Hincks (1888:215) 

 from the Gulf of St. Lawrence, but the zooecia are more truncate at the 

 distal end, spines are present and the beak of the avicularium is strongly 

 decurved. 



Robertson described the species from Alaska, "locality unknown," 

 growing on a crab. The only other record is that of O'Donoghue, Swift- 

 sure Shoal, British Columbia, 25 fms. 



Big Koniuji Island, Alaska, Sta. 82-40, 25 to 30 fms, and off Hallo 

 Bay, Alaska, Sta. 139-40, 28 to 40 fms, U. S. Alaska Crab Investigation. 



Genus SESSIBUGULA new genus 

 Plate 26, figs. 1, 2 and 3 



Zoarium encrusting, loosely attached, dorsal wall smooth, without 

 radicles. Gymnocyst extensive and bearing buguloid avicularia and tubu- 

 lar spines ; ooecium hyperstomial, buguloid ; operculum wanting ; septulae 

 multiporous in the lateral and uniporous in the distal walls ; calcification 

 slight. Genotype, S. translucens new species. 



In spite of its encrusting nature, this form definitely belongs in the 

 Bugula complex. The absence of a calcified dorsal area on either side of 



