

102 MEDUSAE. I. 



Genus Eirene Eschscholtz. 



Eirene viridula (Peron et Lesueur). 



Mayer 1910, Medusse of the World, p. 311. 



Umbrella very flat, about 6 15 mm wide; gelatinous substance thin. Stomachal peduncle half as long as bell-radius, 

 pyramidal, slender. Stomach small, with 4 long, crenulated lips. 4 radial canals, very narrow. Gonads linear, somewhat sinuous, 

 developed along the subumbrella parts of the radial canals. 5060 short tentacles and about 100 even smaller tentacles; each 

 of the latter is flanked by a pair of cirri; each of the tentacular bulbs bears an abaxial excretion papilla. There are about 100 

 small marginal vesicles, each containing 24 concretions. Velum very narrow. Stomach, gonads, and tentacles milky-white, 

 j;reen or reddish. 



Atlantic coasts of Europe, Mediterranean. 



Genus Tima Eschscholz. 



Tima bairdii (Johnston) Forbes. 



Plate V, figs. 4, 5. 6, 7, 8, 9, 10. 

 Diancea Bairdii Johnston 1833. Illustrations in British Zoology. Art. IV. - - Mag. Xat. Hist. Vol. 6. - 



p. 320, fig. 41. 



Thompson 1844. Report on the Fauna of Ireland, Invertebrata. - - Rep. i3th Meeting, 



Brit. Assoc. - - p. 282. 

 Tima? Forbes 1846. On the Pulmograde Medusae of the British Seas. -- Ann. Mag. Nat. Hist. 



Vol. 1 8. - - p. 286. 

 Medusa (Tima Eschsch.) Dalyell 1847 48. Rare and remarkable Animals of Scotland. Vol. 2. p. 250; 



PI- 52, fig- 5- 

 Tima Bairdii Forbes 1848. British Naked-eyed Medusse. -- p. 37; PI. 5, fig. i. 



Allman 1871. Monograph of the Gymnoblastic or Tnbularian Hydroids. - - pp. 36, 140, 

 figs, n, 12. 

 Bohm 1878. Helgolander Leptomedusen. -- Jenaische Zeitschr. Bd. XII (N. F. Vol. I). - 



PP- H3. J 45- 

 Haeckel 1879. System der Mednsen. - - p. 205. 



Description: 



Umbrella hemispherical or somewhat higher than a hemisphere, about 60 mm wide when fully 

 developed. Gelatinous substance very thick. The stomachal peduncle is nearly conical; it is highly 

 contractile; its length as well as the width of its base are, accordingly, very much variable, and mea- 

 surements of preserved material are, therefore, of no great value; but the approximate dimensions may- 

 be stated as follows: The diameter of the base of the peduncle varies between about '/ 2 and 2 / s of the 

 diameter of the bell; the length is, when expanded, about equal to the bell-diameter, the peduncle 

 extending more or less beyond the level of the bell-margin. 



The stomach (Plate V, fig. 5) is small, square, fixed to the flattened terminal end of the pe- 

 duncle by a cross-shaped figure; thus there are four flat, triangular pouches between the dorsal wall 

 of the stomach and the terminal end of the peduncle. In some cases, i. e. in certain conditions of con- 

 traction, the entire stomach is cross-shaped in transverse section. The four perradial lines of attachment 



