652 ALLAN HANCOCK PACIFIC EXPEDITIONS VOL. 14 



talis from Puget Sound to southern California. O'Donoghue recorded 

 it along with occidentalis from numerous places in British Columbia and 

 Puget Sound. 



The variety, if the varietal distinction is really worthwhile in this 

 case, appears to occur throughout the range of tuba, in the same habitat, 

 and they are found together in the Pleistocene at a number of places in 

 southern California. 



Tubulipora pacifica Robertson, 1910 

 Plate 68, fig. 1 



Tubulipora pacifica Robertson, 1910:248. 

 Tubulipora pacifica, O'Donoghue, 1923:8; 1926:25. 



The zoarium is encrusting, usually on algae ; small ( rarely more than 

 3 mm across), white and rather delicate; fan-shaped to nearly circular, 

 or occasionally with lobes of the same form. The immersed zooecial 

 tubules are long and slender, transversely arched and thickly punctate. 

 The peristomes are moderately high, about 0.12 mm in diameter; near 

 the center of the colony they are single but farther out they are usually 

 fasciculate, with one or two rows of peristomes which are connate with 

 the tips divergent ; there is a tendency for them to be distributed biradi- 

 ately, on either side of the zoarial axis. 



The fully developed ovicell appears to be considerably larger than 

 in T. pulchra, with as many as 3 or 4 lobes between the fascicles, but 

 frequently they are much simpler, pyriform, and resemble those of 

 Crisia, only more immersed, and all the intermediate conditions may be 

 observed. The ooeciostome is comparatively short and is very briefly 

 connate with the succeeding tubule at its base, sharply diverging proxi- 

 mally, or as Robertson expressed it, "It seems to emerge from the side 

 of a zooecium at right angles to it." It is flared outward at the tip, 

 compressed, the ooeciopore elliptical and about 0.18 mm in its greatest 

 diameter. 



At first glance the species has much the appearance of pulchra but the 

 dorsal side is smooth without attachment processes, there is no serration 

 of the margin at the base, the peristomes are larger, stiffer-looking and 

 in adult colonies there is always some fusion of the peristomes into small 

 fascicles. Robertson described and listed it from various shorewise locali- 

 ties in southern California, and O'Donoghue recorded it from numerous 

 places in British Columbia. It has a wide distribution along the coast to 

 as far south as Colombia ; apparently a shallow-water species, but dredged 

 down to 47 fms. 



