268 



MEDUSAE OF THE WORLD. 



shield-shaped. About 24 very small, slender tentacles with swollen basal bulbs. 50 to 70 

 lithocysts on bell-margin between the tentacles. Each lithocyst a closed sac with a single con- 

 cretion. No cirri. 4 long, straight radial-canals, with 4 linear gonads on their outer (distal) 

 halves. Stomach small, with4 simple lips. Nopeduncle. Stomach, gonads, and tentacle-bulbs 

 rusty, reddish-brown, yellowish, fleshy pink, milky, or green. Common throughout the year 

 in the Mediterranean. 



142^. 



142. 



140. 



144. 



H3- 



Fig. 140. — "Medusa cymbalo idea," after Slabber, 1778, in Naturkurnlip- Verlustigingen=P/)lfl//<fl'um hemhphxricum. 



Fig. ni.—"Eucope thaumanlioides," after Gegenbaur, in Zeit. fiir wissen. Zool., Bd. 8 = Phialidium hemispharkum, 



half grown. 

 Fig. hi.— Phialidium hemispharicum, from life, by the author, Zoological Station, Naples, January, 1908. 

 Fig. 143. — Phialidium hemispharicum, from life, by the author, Zoological Station, Naples, December, 1907. 

 Fig. 144.— Phialidium hemisphttricum, from life, by the author, Mousehole, Cornwall, England, October, 1907. 



