L.M.B.C. MEDUSA. 279 



At the end of March, 1894, I took with the tow-net 

 some early stages. One specimen taken on March 30fch. 

 Umbrella bell-shaped, about f mm. long. 24 tentacles — 

 6 in each segment. 8 adradial marginal vesicles, each 

 containing 3 otoliths. Tentacle-bulbs of a brownish 

 colour. Another specimen taken on March 31st about 30 

 tentacles present. A black ocellus at the base of each 

 marginal vesicle. A specimen taken on April 18th with 

 80 tentacles. 



Distribution. — Norway, Heligoland, Shetland, St. 

 Andrews, Cromarty Firth. 



Epenthesis cymbaloidea, (Slabber 15). 

 Thaumantias thompsoni, Forbes (9). 



Clubb (7) records that this species was obtained in 

 fairly large numbers, during August, 1885, off Port Erin. 



Distribution. — France, Holland, Cornwall, Koundstone 

 (Ireland) . 



Mitrocomella polydiadema, (Komanes 15). 

 Tiaropsis polydiademata, Komanes (18). 



Romanes first gave a correct description of this medusa 

 from specimens taken in Cromarty Firth in 1875 ; and it 

 has not been since recorded. Romanes describes the 

 species as follows : — The umbrella resembles a deeply 

 shaped bowl. Manubrium so small as to be almost 

 invisible. Tentacles 45 in number and arranged in two 

 series, in one of which the tentacles are long and in the 

 other short. Four radial canals. Sixteen marginal 

 vesicles, 4 in each quadrant, and each contains about 30 

 otoliths. The medusa is brilliantly luminous when stim- 

 ulated, the light being confined to a narrow and continuous 

 line round the margin of the umbrella. The manubrium, 

 radial canals, ovaries and tentacles of a rich rose colour. 

 Umbrella about 1 inch in diameter. 



