742 ALLAN HANCOCK PACIFIC EXPEDITIONS VOL. 14 



The zoaria are comparatively small, low, straggling, with a moderately 

 regular dichotomous mode of branching. The zooecia are found in bi- 

 serial spirals that may, but usually do not, fill an internode, most fre- 

 quently occupying only the distal portion. The zooecia are short, ranging 

 in length from 0.35 to 0.46 mm, closely connate, except at the tips. This 

 species differs from A. convoluta, whose zooecia are also connate, in its 

 smaller size, its reptant habit, and in having the proximal half of the 

 internode usually devoid of zooecia. 



A. distans has been reported previously from the South Atlantic by 

 Busk, 1886:33; from Australian waters by MacGillivray, 1889:30; 

 Java, Harmer, 1915:68; Puerto Rico by Osburn, 1940:339; and Puget 

 Sound, O'Donoghue, 1925. 



The specimens in the Hancock collection (20 stations) range geo- 

 graphically from Santa Rosa Island, southern California, to the Gulf 

 of California. 



Genus ZOOBOTRYON Ehrenberg, 1831 



Zoaria loosely spreading, flaccid, not creeping, branching in an irregu- 

 lar fashion. Zooecia ovoid, narrowed at the point of origin and attach- 

 ment to the stolon. Polypide with a prominent gizzard. Genotype: 

 Hydra verticillata delle Chiaje, 1828. 



Zoobotryon verticillatum (delle Chiaje), 1828 

 Plate 79, fig. 3 



Hydra verticillata delle Chiaje, 1828:203. 



Zoobotryon pellucidus Ehrenberg, 1831: no pagination. 



Zoobotryon pellucidum, Osburn, 1940:341. 



The zoaria are flaccid, lavishly branching into tangled masses. The 

 stolons are transparent, very flexible, only lightly chitinized, ranging in 

 diameter from 0.40 to 0.70 mm. At intervals both the stolon and the 

 zooecia may be partially obscured due to a deposit of silt. The zooecia 

 are usually found arranged bilaterally along the stolons, but not in- 

 frequently they occur in scattered clumps. The zooecia range in length 

 from 0.36 to 0.48 mm, and in width from 0.12 to 0.17 mm; elongated- 

 ovoid, rather narrow at the point of origin and attachment to the stolon, 

 tapering to a bluntly square tip at the distal apertural orifice. The poly- 

 pide is provided with a prominent gizzard. While this is the first direct 

 description of this species from the Pacific coast of North America, Miss 

 Alice Robertson, 1921:63, mentioned in her paper on the Bryozoa of 

 the Bay of Bengal that she had seen this species in San Diego, California, 

 and had received specimens from Hawaii. 



