
No.427.] CCLENTERATE FAUNA OF WOODS HOLE. 557 
film of horny secretion referred to above. The primary ten- 
tacles are usually four in number and arise as small buds from 
the broad oral end of the polyp about the same time as the 
mouth is formed. In many cases the number varies, only two 
arising at opposite sides, two others following at intermediate 
positions. More rarely only three tentacles occur in the pri- 
mary set, followed by three others likewise in intermediate 
positions, giving the polyp at first a trimerous and later a 
hexamerous aspect, —a condition usually associated with the 
phenomenon of a triangular mouth which continued even dur- 
ing the entire history of the polyp. In several cases bifur- 
cated tentacles occurred, and continued during the scyphistoma 
stage. The average number of tentacles is sixteen, though 
this may also vary considerably, many specimens being noted 
with twenty or more. The scyphistomz of Cyanea are almost 
clear white in color, in rather marked contrast with the dull 
flesh color of the polyp of Aurelia, and when viewed in 
colonies against a black background present a most beautiful 
picture. 
Stolonization.— This is a much less common feature in 
Cyanea than in Aurelia, though not by any means rare. Sto- 
loniferous processes may arise from the bases or sides of the 
polyps, and growing laterally may become attached and serve 
as points of origin for new buds. They are, however, fewer 
in number and give rise to no such complex colonies as are 
frequent in polyps of Aurelia. No cases of the direct origin 
of secondary polyps from the body of the parent were noted 
in the case of Cyanea. 
Strobilization. — Owing to the small size of the polyp of 
Cyanea, strobilization is comparatively inconspicuous and was | 
only at first noted about the time the fully formed ephyra 
rendered the fact evident and directed attention to it. The 
segments are few in number, in many cases a single one only 
occurring at a time, though three or four are not unusual; but 
in no case were more than five noted upon any given specimen. 
In the cases of polystrobilous specimens the basal portion 
seemed to renew its activities, new tentacles arising and the 
specimen showing every indication of healthy development, 
