NO. 3 OSBURN : EASTERN PACIFIC BRYOZOA CYCLOSTOMATA 743 



According to Osburn, 1940:342, this species is circumtropical. It 

 has been recovered from the warm waters of the Mediterranean, from 

 Bermuda, Florida, Puerto Rico, Gulf of Mexico, and Brazil. 



Specimens in the Hancock collection are from San Diego, California, 

 no further data given. 



Genus BOWERBANKIA Farre, 1837 



"Zooecia arising irregularly from an erect or creeping axis, commonly 

 in definite groups. Tentacles 8-10. Gizzard present." Harmer, 1915:70. 

 Genotype: Sertularia imbricata Adams, 1800. 



Bowerbankia imbricata (Adams), 1800 

 Plate 79, fig. 4 



Sertularia imbricata Adams, 1800:11. 

 Bowerbankia imbricata, Robertson, 1900:331. 

 Bowerbankia imbricata, O'Donoghue, 1925:93. 



The zoaria form irregular tangled masses, with reptant stolons having 

 a diameter ranging from 0.06 to 0.09 mm. The stolons are divided into 

 internodes of variable length, separated by a diaphragm perforated by 

 a single pore. The zooecia are elongate-tubular, straight or slightly 

 curved, and have a square distal extremity. The proximal zooecial por- 

 tion may be extended to form a short caudate process of one or two 

 prongs. The zooecia are constricted at the point of origin on the stolon. 

 The zooecial length of the eastern Pacific specimens ranges from 0.92 

 to 1.15 mm. A gizzard is present. The tentacle number is 10, as de- 

 termined from serial sections. 



This species appears to be well distributed in the cooler European 

 waters. In the eastern Pacific, it has been previously reported from 

 Alaska and Puget Sound. 



In the Hancock collection, the specimens of this species are from 

 British Columbia, E. F. Ricketts, collector, no bathymetric data avail- 

 able. 



Bowerbankia gracilis Leidy, 1855 

 Plate 79, fig. 5 



Bowerbankia gracilis Leidy, 1855:142. 



Bowerbankia gracilis, O'Donoghue, 1923:192; 1925:93. 



Bowerbankia gracilis, Osburn, 1940:341. 



