316 



MEDUSAE OF THE WORLD. 



The color of the entodermal parts of the tentacle-bulbs, gonads, and stomach is milky- 

 white, all other parts being of a glassy transparency. Haeckel states, however, that light- 

 green blue, or yellow coloration may also exist. 



This species is found in deep water in the Mediterranean. Goette describes a similar 

 medusa from the coast of Zanzibar. 



Claus 1881, studied the growth of the Mediterranean medusa. When 1.5 mm. wide 

 there are only 4 radially placed tentacles, flanked by 8 lithocysts, each with a single concretion. 



Fig. v$.—"Campanulina acuminata;' after Hincks, in British Hydroid Zoophytes. 

 This may be the hydroid of Tima or Eirene. Hydroid and young medusa. 



The stomach is small and lacks a peduncle, and there are 4 short lips. The bell is then higher 

 than a hemisphere, with thin walls, and there are no gonads upon the 4 radial-canals and no 



marginal cirri. . 



Metschnikoff, 1886, found that the entoderm of the planula is formed by ingression ot 

 cells from the hinder end of the spindle-shaped, one-layered larva. According to Graefte, 1884, 

 the hydroid of E. " pellucida" is possibly Campanulina acuminata Alder. 



The dimensions of a mature medusa from Naples are as follows: Bell 74 mm. wide, 

 31 mm. high. Peduncle 31 mm. wide at its base and 49 mm. long. Stomach 11 mm. long. 

 Contracted tentacles 13 mm. long. 



