38 



(Fig. 20, ect ). After the i'irst day a slir^ht pit indicates 

 the point at which the coelenteron is to open externally 

 (Fig. 23, .J ); this process, as observed in a number of cas- 

 es, is exactly the same as in the sexually produced polyp. 

 The tentacles also make their appearance in tl^.e same manner 

 as described for the hydra which came from the egg. 



The length of time I'equired for the complete devel- 

 opment of a bud, from its first appearance on the hydrocau- 

 lus of the parent as a round knob, until the comp^letion of 

 the formation of the coelenteron and appearance of the ten- 

 tacles, is from ten to fourteen days; (a) the first period, 

 including as far as the detachjnent of the bud, five days; 

 (b) free swimming planula, two to four days; (c) from at- 

 attac?unent to appearance of tentacles, three to five days. 

 These periods refer, of course, to specimens which develop- 

 ed in captivity. 



Figure 24 shows a specimen from an entirely differ- 

 ent lot of polyps from those which exhibited the budding 

 phenomena shown in figures 14 to 23. This polyp was killed 

 when 23 days old. It may not be a normal individual, but 

 shows a tendency to divide t ransversely and seems worth 

 calling attention to. The coelenteron has completely di- 



