394 TRANSACTIONS LIVERPOOL BIOLOGICAL SOCIETY. 



Margellium begins to appear early in the spring, usually 

 abundant in April, and becomes scarce during May. 

 Lizzia begins to appear about May. Forbes states that 

 it is of solitary habit. 



I have taken specimens with two tentacles in each of 

 the j)erradial groups. Medusa-buds are usually .present 

 on manubrium, at first yellowish in colour. 



It is possible that Dysmorphosa iJiinima is the earliest 

 stage of this medusa. 



Distribution. — -Shetland, St. Andrews, Cornwall. 



Margelis principis, Steenstrup {15). 



This medusa is not nearly so abundant as Margelis 

 ramosa. It may be easily recognised and distinguished 

 from M. ramosa by the very large crescent or U-shaped 

 tentacle-bulbs. It also has about twice as many marginal 

 tentacles in each group and about three times as many 

 branches on the oral tentacles. Steenstrup first described 

 this medusa from specimens obtained off the Faroe Islands 

 and Iceland. Haeckel describes and figures the original 

 specimens taken by Steenstrup which are in the museum 

 at Copenhagen. 



In 1893 I met with a single specimen of this species. It 

 was taken in Flesh wick Bay, near Port Erin, on May 21st. 



The Manx specimen agrees with HEeckel's description 

 except in some minor details. Hoeckel figures the tentacle- 

 bulbs with a dark horizontal line at the top and under it 

 an ornamental wavy line. The Manx specimen has in 

 place of the wavy line a series of longitudinal lines, one 

 opposite each tentacle. At the base of each tentacle there 

 is a black ocellus. About 25 tentacles in each group and 

 about 25 terminal branches to each oral tentacle. Um- 

 brella 4 mm. in length and width. On May 5th, 1894, 

 I met with another specimen in Port Erin Bay. The 



