JQ2 MEDUSA. I. 



Genus Eirene Eschsclioltz. 



Eirene viridula (Peron et Lesueiir). 



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



Umbrella verj- 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. 50—60 short tentacles and about 100 even smaller tentacles; each 

 of the latter is flanked b)- a pair of cirri; each of the tentacular bulbs bears an abaxial e.xcretion papilla. There are about 100 

 small marginal vesicles, each containing 2—4 concretions. Velum very narrow. Stomach, gonads, and tentacles milky- white, 

 green or reddish. 



.Atlantic coasts of Europe, Mediterranean. 



Genus Tima Eschscholz. 



Tima bairdii (Johnston) Forbes. 



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



Diamra Bairdii Johnston 1833. Illustrations in British Zoolog\-. Art. IV. — Mag. Nat. Hist. \'ol. 6. — 



p. 320, fig. 41. 

 — — Thompson 1844. Report on the Fauna of Ireland, Invertebrata. — Rep. 13th Meeting, 



Brit. Assoc. — p. 282. 

 Tima? — Forbes 1846. On the Puhnograde Medusce of the British Seas. — Ann. Mag. Nat. Hist. 



Vol. 18. — p. 286. 

 Medusa [Tiiiia Eschsch.) Dalyell 1847—48. Rare and remarkable Animals of Scotland. Vol. 2. — p. 250; 



1^1- 52, fig- 5- 

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



— — Allnian 1871. Monograph of the Cxymnoblastic or Tubularian Hydroids. — pp. 36, 140, 



figs. II, 12. 



— — Bohm 1878. Helgolander Leptomedusen. — Jenaische Zeitschr. Bd. XH (N. F. Vol. I). — 



PP- 143. 145- 



— — Haeckel 1879. System der Medusen. — 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 nearh- conical; it is highly 

 contractile; its length as well as the width of its base are, accordingl\-, \'ery 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 -,5 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 b}' 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 



