MEDUSA. I. 107 



Seasonal occurrence: Off the British coasts large specimens are found during the autumn 

 and winter, apparently not later than the end of January; according to Mcintosh young speci- 

 mens have been found in February, Ma)', and August. — In the Danish waters quite young specimens 

 have been found in June and July; large specimens occur during the winter and early spring from 

 November to April, rareh- in May. 



Family yCquoridae. 

 Genus /Equorea Peron et Lesueur. 



/Equorea forskalea Peron et Lesueur. 



Mayer 1910, Medusae of the World, p. 325. 



Umbrella usually flatter than a hemisphere, up to about 400 mm wide; gelatinous substance thick in the middle part, 

 ihin at the margin. Stomach wide, mouth usually' widely gaping, with several pointed hps. Numerous simple radial canals 

 I up to about 200), carrying the gonads. Numerous tentacles of varying length. No cirri. Marginal vesicles even more numerous 

 than the tentacles, each containing 2 — 4 concretions. Colour highly variable. 



The species is widely distributed, but the distribution cannot be stated exactly, because we are not yet able to esta- 

 blish the limitations between the different species or variaties of .Eqiwrea described. It has Ijeen found off the .\tlantic coasts 

 of CSreat Britain and the northern part of Norway'. 



Genus Zygodactyla Brandt. 



Zygodactyla groenlandica (Peron et Lesueur). 



Mayer 1910, Medusse of the World, p. 335. 



Umbrella usually flatter than a hemisphere, large; gelatinous substance verj' thick in the middle part, thin at the 

 margin. Stomach broad, flattened, with a prolonged, cylindrical mouth-tube; the mouth is provided with long, pointed lips, 

 equal in number to the radial canals. About 100 simple radial canals, carrying the gonads; between each successive pair of 

 radial canals the subumbrella carries a row of gelatinous, wart-like protuberances. Tentacles slightly more numerous than the 

 radial canals, long, with tapering bulbs. Between each successive pair of tentacles there are about S-12 marginal vesicles, 

 each containing 2 concretions. There are no cirri. Velum rudimentary. Colour of gastro-genital system and tentacles very 

 delicately pink. 



East coast of North .\merica and west coast of Greenland. 



H* 



