164 THE MEDUSAE. 



Otocysts. — There are about thirty-five otocysts (on part of the margin 

 they are destroyed so that accurate counting is impossible), each containing 

 from three to five otoliths (PI. 36, fig. 2). 



Gonads. — These are linear and occupy the entire length of the canals 

 from their distal extremities to the base of the broad peduncle. There are 

 no sexual organs on the peduncle. The specimen is a male. 



Color. — The gonads and manubrium in life were opaque and milky ; 

 otherwise the Medusa was colorless. 



Eirene viridula is to be distinguished from the other Indo-Pacific members 

 of the genus by the presence of cirri scattered along the bell margin ; for, al- 

 though both ^. danducnsis (palkeiisis) and E. ceylonensis have cirri, they occur 

 only at the sides of the tentacular bulbs. The present specimen differs from 

 most descriptions of the Atlantic form in having a very broad peduncle and 

 few tentacles. It is possible therefore that it may represent a distinct Pacific 

 race; but since Maas ('93) has shown that the form of the peduncle is vari- 

 able in E. viridula, and since the number of tentacles increases with growth, 

 it is best not to lay stress on these apparent differences until a larger series is 

 studied. The occurrence of this species in the Pacific is not surprising in 

 connection with the fact that it has twice been recorded from the Indian 

 Ocean (Chun, '96 ; Goette, '86). 



Eutiminae Maas, 1905. 



Eutimidae Haeckel ('79). 



Eucopidae with only eight octocysts; with long gelatinous peduncle. 



Modern researches indicate that Haeckel's genera Eutimium and Euti- 

 meta represent merely temporary stages (in the condition of the marginal 

 organs) of Eutima. Octorchis, Octorchandra, and Octorchidium, in which 

 sexual products are developed on the peduncle as well as on the subum- 

 brella, certainly represent only a single genus Octorchis. And this one is 

 of questionable validity; for although it is retained by Browne (:05''), it 

 seems to me that the discovery by Maas (: 05) that some individuals of 

 Eutima levuka Agassiz and Mayer have gonads both on the subumbrella and 

 on the peduncle, while others have them only on the subumbrella, throws 

 doubt on its claim to recognition. Respecting Eutimalphes I cannot agree 

 with Maas (: 05) that it is closely allied to Tima ; for it has the number of 

 otocysts characteristic of Eutima, from which genus it is separable only by 

 the somewhat shorter peduncle and the much greater number of tentacles. 



