NO. 1 OSBURN: EASTERN PACIFIC BRYOZOA — CHEILOSTOMATA 161 



Caulibugula ciliata (Robertson), 1905 

 Plate 24, figs. 4 and 5 

 Stirparia ciliata Robertson, 1905 :279. 

 Stirparia ciliata, O'Donoghue, 1923-22. 

 Stir par ella ciliata, O'Donoghue, 1926:47. 



This is a peculiar species, showing certain resemblances to Bicellari- 

 ella ciliata (Linnaeus). The slanting, oval, opesial area, the rounded 

 distal end without angulations, the attachment of the ovicell on the inner 

 border of the distal part of the zooecium, all of these are found in 

 B. ciliata. 



On the other hand there are neither dorsal spines nor a proximal 

 spine, and the basal zooecia of the colony as well as the proximal zooecia 

 of the basal branches are modified into kenozooecia and form a stalk. 

 The basal zooecia of the upper branches are not so modified. The stalk 

 zooecia, well represented in Robertson's drawing, pi. 12, fig. 68, are 

 only partially modified into kenozooecia and appear to have contained 

 zooids. On the whole the resemblance is so great that the writer was 

 once misled (Osburn 1923:7) to make the suggestion that this might be 

 merely a variety of B. ciliata (Linnaeus). 



Robertson had the species from a number of localities along shore on 

 the California coast from Pacific Grove northward. O'Donoghue lists it 

 for several British Columbia localities. 



Hancock Station 1281-41, 3 miles east of South Point, Santa Rosa 

 Island, southern California, 23 to 26 fms. Also from Dillon Beach, Cali- 

 fornia (Menzies collection), and from Lands End, San Francisco Bay, 

 California (Robertson collection). 



— 'f Caulibugula occidentalis (Robertson), 1905 

 Plate 24, fig. 6 

 Stirparia occidentalis Robertson, 1905 :280. 

 Stirparia occidentalis, O'Donoghue, 1293:22, 1925:100. 

 Sfirpariella occidentalis, O'Donoghue, 1926:47. 



This species has the segments of the stalk fully modified into keno- 

 zooecia and the first zooecium is also modified in the manner characteris- 

 tic of the genus. The basal zooecium of a branch, however, is scarcely 

 different from those distal to it. 



The zooecia are elongate and curved and occasional individuals have 

 the "joint" which is characteristic of the genus Bicellariella. The distal 

 end of the zooecium is rounded, with two or three long, jointed, outer 

 spines and one inner spine. The opesia occupies nearly half of the frontal 



