1910] Robertson: Cyclostomatous Bryozoa. 249 



T. pacifica occurs on kelp, often in great abundance, a single frond being 

 frequently covered thickly with these small white colonies. Obtained on 

 shore kelp off San Clemente Island, and at Coronado; also dredged off 

 the Southern California coast at various stations, in depths ranging from 5 

 to 18 fathoms. 



94. Tubulipora occidentalis sp. now 

 PI. 22, figs. 29, 30, 31. 



Zoarium adnate, flabelliform, when young, rounded or cir- 

 cular, when adult and growing on flat surfaces (pi. 22, fig. 31) ; 

 often incrusting stems, (fig. 30), when the colony may form a 

 regular or irregular, contorted mass. Central part of colony 

 depressed, surrounded by zooecia which are sub-erect, and 

 arranged in connate, radial bundles in series of two, three, or 

 more rows (fig. 29). Oacium (oe.) an inflation of the surface, 

 large, involving many zooecia, hence lobed, extending between 

 the series of zocecia like the fingers of a glove. O'ceciostome 

 small, compressed, smaller than the aperture of a zocecium; tube 

 of oceciostome (oest. t.) usually radial, arising in a depression 

 between the bundles of zooecia, and often quite separated from 

 the zocecia, though sometimes connate with a zocecium; com- 

 pressed, narrow below, wider above or toward the distal end. 

 Oceciopore (oep.) slit-like, its longer diameter parallel with a 

 radius of the colony, and as great, or greater than a diameter of 

 a zocecium; opening directly upward. 



This species is easily recognized by its coarse appearance, 

 its color, a dirty gray, its tendency to grow in rough calcareous 

 masses around stems and over the surface of kelp. The polypide 

 is usually of a deep purple, but in deep water the calcareous 

 masses are often white. This species answers in some respects 

 to the description given by Hi neks ( '84) for T. fasciculifera, 

 but neither from the description nor from the plate he gives 

 can it be identified positively as such, although this species is 

 probably closely related to the Queen Charlotte form. 



T. occidentalis has been found in considerable abundance at various 

 localities. Obtained between tide marks at Whites Point, near San Pedro, 

 and at Monterey Bay, California, investing stems of coralline; also at 

 Channel Rocks, and at San Juan County, Puget Sound, Washington; 

 dredged at several stations off the coast of Southern California in depths 

 ranging from 4 to 32 fathoms. 



