NO. 3 OSBURN : EASTERN PACIFIC BRYOZOA CYCLOSTOMATA 651 



Tubulipora tuba van fasciculifera (Hincks), 1884 



Plate 68, fig. 10 



Tubulipora fasciculifera Hincks, 1884:206. 

 Tubulipora occidentalis Robertson, 1910:249 (in part). 

 Tubulipora fasciculifera, Canu and Bassler, 1923:197. 

 Tubulipora fasciculifera, O'Donoghue, 1923:8; 1926:24. 



The zoarium is very similar to that of T. tuba, presenting the same 

 variations in form. The zooecia are also similar, the free portions of the 

 tubules varying much in length and having the same diameter (0.12 

 mm). The only zoarial difference is that made use of by Canu and 

 Bassler, the fascicles "never composed of more than 6 tubules," while 

 in tuba there may be "from 6 to 20." 



The ovicell, like that of tuba, is expanded into lobes w^hich extend 

 between the fascicles, and here also there is the occasional occurrence 

 of simpler ooecia. The ooeciostomes are usually situated proximal to the 

 first tubule of a fascicle, connate with it for a short distance, with the 

 flattened ooeciopore transverse to the axis of a fascicle, the top of the 

 ooeciostome sometimes a little flared. 



After studying more than a hundred specimens from various locali- 

 ties, I am unable to distinguish sharply between tuba and fasciculifera. 

 The above diagnoses are for well-marked specimens, but intermediate 

 conditions occur in all of the diagnostic characters. Many colonies have 

 only the smaller fascicles, others mostly small ones with a few larger 

 fascicles, and still others have chiefly the larger numbers. Occasionally 

 the long fascicles arise near the center of the zoarium, while in other 

 specimens they are nearer the edge. The ooeciostomes of tuba are usually 

 lateral to a tubule with the pore in line with the fascicle, but may be 

 proximal to a tubule with the pore transverse, and in fasciculifera both 

 of these conditions may sometimes be seen on the same zoarium. The 

 form of the ooeciostome is variable though it is always more or less 

 compressed ; sometimes it is slightly flared at the tip, or it may be per- 

 fectly straight (possibly those in the latter condition have not quite 

 completed their growth). If the size of the fascicles and the position 

 of the ooeciostome were constant they would be considered good specific 

 characters, but I do not find them so. 



Hincks described T. fasciculifera from British Columbia, the exact 

 locality not stated. Robertson mentions it under her description of T. 

 occidentalis, which embodies some of the characters, and lists occiden- 



