HYDROMEDUSAE 



299 



by Benham (1909) leave no doubt of its identity with Ph. falklandica. Owing to the 

 small height in proportion to the diameter of the umbrella Benham hesitated to refer 

 his specimens to the Falkland species, but in all other respects, and in the development 

 of the tentacles, they agree so perfectly with this latter that the identity seems beyond 



V " ^ 



Diameter 



oF 

 umbrella 



mi mi 



08 



V — ^ 



"^?" 



Y 



=^="T 



V V y 



45 



T 



"^^^ 



T 



TT=T=^=Y 



15 3 4 2 4 3 5 1 



Fig. I. Phialella falklandica. Diagram showing the rate of development of the tentacles. 



doubt. Two species, described by von Lendenfeld (1884), Eucope minulata (p. 602, 

 pi. 28, figs. 53-57) from Lyttleton Harbour, New Zealand, and E. hyalina (p. 920, 

 pi. 42, figs. 16-17) from Sydney Harbour, New South Wales, Australia, may belong to 

 the genus Phialella, but the descriptions and figures are so deficient that it will be 

 impossible to identify the species. The European species, Ph. quadrata, differs from 

 Ph. falklandica mainly in its gonads which are much shorter and with plain sides, not 

 hanging down in folds. 



Genus Phialidium Leuckart (1856) 

 Generic characters. " Eucopidae" with sixteen or more tentacles and with one to 

 three marginal sensory vesicles between every two tentacles ; no marginal cirri. A gonad 

 on each of the four radial canals. Stomach not on a peduncle. 



Phialidium simplex Browne (Plate XVH, figs. 5-9) 



Phialidium simplex Browne, 1902, p. 282. 

 Phialidium simplex Browne, 1908, p. 236. 

 Phialidium simplex Mayer, 1910, p. 274. 

 Phialidium simplex Thiel, 1938, p. 328. 



5-2 



