L.M.B.C. MEDUSA. 251 



cle-bulbs, without tentacles, golden yellow, with purplish 

 red ocelli. The other tentacle-bulb, golden yellow, bearing 

 a large golden red tentacle, without a purplish red ocellus. 

 King-canal purplish red. When I compared a living 

 specimen of E. aurata, which possessed a crimson ring- 

 canal and tentacle-bulbs coloured with orange and crimson, 

 with the coloured figures given by Hseckel in his mono- 

 graph, I failed to find sufficient differences to separate 

 E. aurata from E. mediterranea. 



Hseckel makes the chief specific difference the absence 

 of the purplish red ocellus in the tentacle-bulb of the large 

 tentacle. In E. aurata there is no proof that the part of 

 the bulb coloured crimson is really an ocellus. In some 

 specimens the colour is absent, but present in others in 

 different shades of crimson. One specimen, taken in 

 1893, had the three bulbs, without tentacles, conspicuously 

 coloured with crimson, but the bulb at the base of the 

 large tentacle had only a faint tinge of a crimson colour, 

 scarcely visible with the microscope. I have noticed in 

 other species of medusae a great variation in colour. 

 Amphicodon fritillaria has usually dark brown or reddish 

 brown tentacle-bulbs, and all the canals colourless ; but 

 in a few specimens the tentacle-bulbs are of a brilliant 

 red colour and also the radial canals. 



Distribution. — Shetland, St. Andrews. 



Amphicodon fritillaria , (Steenstrup 15) . 

 C or yne fritillaria, Steenstrup {21). 

 Steenstrupia globosa, Sars (20). 

 Amphicodon globosus, Haeckel (15). 

 Diplonema islandica, Green (IS). 

 Steenstrupia oiuenii, Green (IS). 

 Hybocodon prolifer, Agassiz (2) Haeckel (15). 

 Amphicodon amphipleitrics, Haeckel (15). 



