650 ALLAN HANCOCK PACIFIC EXPEDITIONS VOL. 14 



Tubulipora tuba (Gabb and Horn), 1862 

 Plate 68, fig. 9 



Semitubigera tuba Gabb and Horn, 1862:169. 

 Tubulipora occidentalis Robertson, 1910:249. 

 Tubulipora occidentalis, O'Donoghue, 1923:8. 

 Tubulipora tuba, Canu and Bassler, 1923:198. 

 Tubulipora tuba, O'Donoghue, 1926:24. 



The zoarium of this abundant species is always adnate, flat and rather 

 regularly rounded or sometimes lobate on flat surfaces, variously con- 

 torted on stems; rather coarse, white, gray or purplish in color. The 

 "peristomes" are nearly erect, 0.12 mm in diameter, varying greatly in 

 length, as much as 2 mm in sheltered locations but usually much less; 

 single near the primary zoid and sometimes over a considerable area, 

 then connate in small fascicles of 2 or more, the marginal fascicles 

 increasing in the number of peristomes to 6, 12 or even as many as 30. 

 The fascicles are usually uniserial or biserial and radiating, but occa- 

 sionally occur in rounded or irregular clumps ; sometimes they are more 

 or less biradial in arrangement, but this is rare. 



The ovicell is usually a large lobate inflation extending between several 

 fascicles, but not infrequently it is smaller, and even simple Crisia- 

 like ooecia may occur on the same zoarium with the larger normal ones. 

 The ooeciostome is tall, straight, compressed, regularly increasing in size 

 toward the tip, usually a little flared at the top, the pore elongated in the 

 direction of the fascial axis ; in typical tuba the ooeciostome arises at the 

 side of the first tube of a fascicle and is usually free for most of its 

 length. The variations are discussed under the variety fasciculifera 

 (Hincks). 



Gabb and Horn described the species from the Pleistocene of Santa 

 Barbara, California, and while their description and figure are incom- 

 plete, there can be no doubt, I have compared abundant recent and 

 numerous Pleistocene specimens. Canu and Bassler listed both tuba and 

 fasciculifera from the Pleistocene of California. Robertson described 

 occidentalis (=^ both tuba and fasciculifera) and listed it from southern 

 California to Puget Sound, and O'Donoghue recorded both from numer- 

 ous localities in British Columbia. 



In the Hancock Collections it is by far the most abundant species of 

 the genus, taken at shore stations and dredged down to a depth of 117 

 fms. It is evidently a species of cooler waters as the most southerly 

 record is that of Station 275, Raza Island, Gulf of California, 28°48'N, 

 113°W. 



