6 4 



MEDUS.E. I. 



individuals at Plymouth as late as June nth; the Misses Delap, on the other hand, found large 

 specimens at Valencia Harbour on May 28th 1900; some of these specimens spawned in the aquaria, 

 and the eggs developed into planulae and further to small hydroids. 



The statement of the last-mentioned authors shows that in certain localities the species may 

 breed as early as about June ist, but all other records as well as my own observations indicate that 



Chart VIII. Occurrence of Cosmetira megalotis (Maas). O Occurrence according to the literature. 



the medusae reach maturity in the late summer months, and that the hydroid generation, which has 

 never been found in nature, passes the winter and deliberates the young medusae in the early spring. 



Cosmetira megalotis (Maas). 



Halopsis megalotis Maas 1893, Ergebn. d. Plankton-Exped. Bd. II. K. c. -- p. 57. Taf. VI, Fig. 3, 4, 5, 6. 

 Mitrocoma megaloia Mayer 1910, Medusae of the World. - - p. 289. 

 Cosmetira megalotis Browne 1910, National Antarctic Exped., Nat. Hist Vol. V. --p. 33. 



This medusa was taken by the Plankton-Expedition north-west of Scotland on July igth 1889; 

 it has not been found again since it was described by Maas. 



