NO. 3 OSBURN : EASTERN PACIFIC BRYOZOA CYCLOSTOMATA 719 



form around the central area, and vary in size from 2 to 6 tubules, con- 

 siderably elevated above the central area which is somewhat concave. 

 The zooecial apartures measure 0.10 mm in diameter. The larger can- 

 celli are of about the same size, but most of those in the central area 

 are partially closed, with a smaller rounded central pore; there are 

 usually two rows of cancelli between the radii. The zoids around the 

 border are not at all elevated and in most cases are indistinguishable 

 from the cancelli. There is a narrow basal lamina. 



The zoaria are evidently young, as there are no ovicells, and there is 

 a question whether the species is the same as L. octoradiata Waters. The 

 nature of the closure of the cancelli appears to relate it to Disporella 

 rather than to Lichenopora. 



Waters described the species from 71°09' S. Lat., 89° 15' W. Long., 

 and Borg recorded it questionably from 63°57'S, 61°50'W; both of 

 these records are from the area between South America and Antarctica. 



Hancock Station 481, Cartago Bay, Albemarle Island, Galapagos, at 

 12 fms, two colonies. 



Disporella astraea, new species 

 Plate 76, figs. 1 and 2 



Zoarium encrusting with a broad base and rising by vertical budding 

 into a short cylindrical stalk which, with the radiating fascicles, gives 

 the appearance of a minute Astraeid coral. The central area is flat with 

 numerous thick-walled and rather wide open round cancelli, which extend 

 between the rays in two or three rows. The flat top is surrounded by a 

 ring of 10 high, short fascicles. The fascicles are groups composed of 

 4 to about 10 zooecial tubes which are all closely connate, their apertures 

 about 0.07 mm in diameter; the apertures of the cancelli are about the 

 same size, occasionally larger. The encrusting base is 2 mm in width ; 

 the primary zoarium arising from it 1.30 mm wide and about 0.60 mm 

 high; the secondary zoarium or vertical bud is 1.10 mm in diameter and 

 about 0.80 mm high. 



There is no evidence of an ovicell, and therefore the disposition of the 

 species in Disporella is questionable and based merely on zoarial char- 

 acters. 



Type, AHF no. 129. 



Type locality, Hancock Station 451, off Post Office Bay, Charles 

 Island, Galapagos, at 100 fms, one colony. Another somewhat smaller 

 colony at Station 461, off Tagus Cove, Albemarle Island, Galapagos, 

 at 80 fms ; this specimen has 9 slightly smaller and higher fascicles, but 

 otherwise is similar. 



