NO. 2 OSBURN: eastern pacific BRYOZOA CHEILOSTOMATA 323 



Emballotheca latifrons new species 

 Plate 39, figs. 10-11 



Zoarium encrusting, sometimes multilaminar, white. Zooecia mod- 

 erately large, 0.65 to 0.80 mm long by 0.45 to 0.60 mm wide, distinct, 

 broadly arched, the frontal a tremocyst with large infundibular pores. 

 The primary aperture is transverse, moderately large, 0.18 to 0.22 mm 

 wide by 0.13 to 0.16 mm long, the anter a semi-circle and the poster 

 broadly sinuate ; the aperture of the fertile zooecium is noticeably larger. 

 The operculum is well chitinized with a thickened border to which the 

 muscles are attached. The primary peristome is low, thin and smooth 

 and is always visible since it is not covered by the secondary peristome; 

 the latter is low, thick and granulated. A small avicularium, so small 

 that it may often be overlooked, is usually present at one or both sides 

 of the aperture, typically they are opposite the proximal border of the 

 aperture, the mandible pointed and oriented laterally or backward ; occa- 

 sionally they are more proximally situated and they are often wanting. 



The ovicell is large, about 0.40 to 0.45 mm in width and length, 

 somewhat depressed, hyperstomial and closed by the operculum, with 

 large pores similar to those of the frontal. 



Type, AH F no. 61. 



Type locality, Hancock Station 1882-49, Cortez Bank near the 

 United States-Mexican boundar>s 32°33'52"N, 119°15'17nV, at 42 

 fms. Also at Stations 874-38, Anacapa Island; 1181-40, Santa Catalina 

 Island; 1276-41, ofif Point Dume; off San Pedro and off Rocky Point; 

 all from southern California. Also at Station 1252-41, south of San 

 Benito Islands off the west coast of Lower California. The known depth 

 range is 42 to 71 fms. 



Emballotheca obscura new species 

 Plate 40, figs. 9-10 



Zoarium encrusting. Zooecia moderately large, 0.65 to 0.90 mm long 

 by 0.40 to 0.60 mm wide, quadrate to irregularly hexagonal in form, 

 distinct; the frontal a tremocyst with numerous small pores, evenly 

 arched, slightly granulated but with no other decoration, moderately 

 thick and covered with a thin shining ectocyst. The aperture is broader 

 than long, about 0.20 mm wide by 0.16 mm long, the anter semicircular, 

 the cardelles moderately developed and behind these the poster extends 

 for the full width in a broad shallow arc. The operculum is well chit- 

 inized with a marginal sclerite which is broader for some distance beyond 

 the cardelles, the muscular attachments near the border. The peristome 



