NO. 2 OSBURN: eastern pacific BRYOZOA CHEILOSTOMATA 285 



Family GyclicOpOridaC Hincks, 1884 



"Zooecia having the front wall wholly calcified and destitute of 

 raised margins or depressed areas, with a more or less orbicular orifice" 

 Hincks 1884:279. 



Genus GYGLIGOPORA Hincks, 1884 



"Zooecia with a perfectly simple orifice more or less orbicular. 

 Zoarium (in the only known species) incrusting," Hincks, 1884:279. 

 Genotype, monotypic, Cyclicopora praelonga Hincks, 1884:279 ( = 

 Lepralia longipora MacGillivray, 1882). 



Canu and Bassler (1920:424) have added the following characters: 

 Ovicell hyperstomial and always closed by the operculum. The frontal 

 is a tremocyst with pores in quincunx. There are no cardelles. The 

 border of the aperture is straight or somewhat concave. No spines. 



Such a complete simplicity exists in the genotype — absence of avicu- 

 laria, spines and cardelles and all decoration of the zooecium — that 

 it leads one to doubt whether some of the fossil species assigned to this 

 genus belong here. 



Cyclicopora longipora (MacGillivray), 1883 

 Plate 32, fig. 4 



Lepralia longipora MacGillivray, 1883 : 135. 

 Cyclicopora praelonga Hincks, 1884:279. 



Zoarium encrusting or with erect, cylindrical or somewhat com- 

 pressed hollow branches which bifurcate once or twice to an inch or more 

 in height, the branches are usually between 1 and 3 mm wide; without 

 joints. Zooecia moderately large, 0.75 to 0.90 mm long (0.60 to 1.20) 

 by 0.40 (0.35 to 0.50) mm wide, distinct, straight sided and arranged 

 in parallel linear series. The front is evenly arcuate transversely, slightly 

 elevated proximal to the aperture which has a low, thin peristome; 

 numerous small pores perforate the rather thin frontal, which is covered 

 by a delicate glistening membrance. The aperture is rounded, slightly 

 straighter on the proximal border and measures 0.20 to 0.24 mm in 

 length by 0.18 to 0.22 mm in width. The operculum is thin and delicate, 

 with a heavier border and is attached without cardelles a little proximal 

 to its middle. 



The ooecia are hyperstomial, very prominent, hemispherical or slightly 

 elongate, resting on the olocyst of the succeeding zooecium, 0.35 to 

 0.40 mm wide by 0.35 to 0.45 mm long, perforated like the frontal, 

 the orifice wide and high. 



