744 ALLAN HANCOCK PACIFIC EXPEDITIONS VOL. 14 



The zoaria consist of tangled gray masses of stolons and zooecia, 

 repent, not erect, with extremely irregular branching. The zooecia are 

 tubular, narrow, tapering slightly at both the distal and the proximal 

 ends. The distal extremity is square in most cases. The polypide is pro- 

 vided with a prominent gizzard, measuring between 0.08 and 0.09 mm 

 in diameter. The zooecial length ranges from 1.02 to 1.52 mm. None 

 of the zoaria had specimens of mature zoids with a measurement of less 

 than 1.0 mm. As a rule, the specimens with a caudate appendage 

 proximally were the longest. The zooecia are attached to a creeping 

 stolon with or without a lateral extension. The zooecia may occur 

 single, in pairs, or in dense clusters. The stolonal diameter is variable, 

 ranging from 0.03 to 0.05 mm. The stolons have internodes of variable 

 length, separated by diaphragms which are perforated by a single pore. 



In the eastern Pacific specimens in the collection, it was found that 

 both caudate and non-caudate individuals occur within the same zoaria, 

 with the non-caudate form predominant. No zoaria were found in which 

 the caudate individuals occurred solely. 



Bowerbankia gracilis is a "cosmopolitan species," having been previ- 

 ously reported from Greenland to Puerto Rico to Brazil. 



Specimens in the Hancock collection are from Puget Sound, Wash- 

 ington; Dillon Beach, Tomales Bay, California, R. C. Osburn collector; 

 Los Angeles Harbor; and the Gulf of California. All collections were 

 made in the intertidal range. Hancock station, 510-36, Espiritu Santo 

 Island, Gulf of California. 



Bowerbankia gracilis aggregata O'Donoghue, 1926 



Plate 79, fig. 6 



Bowerbankia gracilis var. aggregata O'Donoghue, 1926:58-60. 



The zoaria form dense tangled masses which completely obscure the 

 substrata. The stolons, as in B. gracilis Leidy, have internodes of vari- 

 able length, limited by diaphragms perforated by a single pore. The 

 zooecia are very greatly elongated, ranging in length from 1.77 to 2.25 

 mm. The tentacle number is 8. 



This variety was described by O'Donoghue from the Vancouver 

 Island region. 



The specimens in the Hancock collection are from Point Barrow, 

 Alaska, Arctic Research Laboratory, G. E. MacGinitie, collector; Puget 

 Sound, Washington, J. L. Mohr, collector ; Dillon Beach, Tomales Bay, 

 California, R. C. Osburn collector ; and Los Angeles harbor, California. 

 The depths range from intertidal to 9 fathoms. 



