476 MK. B. T. BnowNB ON [Mar. 17, 



Lizzia UoncUna has, in the adult stage, four perradial groups of 

 three tentacles and four single interradial tentacles. The increase 

 of new tentacles is shown in the following list. 



Specimens collected by Mr. Garstang at Plymouth during July 

 and August, 1803 : — 



Perradial tentacles ... . 1111 „ . « 

 Interradial tentacles . . liil ^ ^ 



Perradial .... 1112 2211 2\2\ 2222^ 



Interradial .. 1111' llll' 1111' 1111 



On ray arrival at Plymouth at the end of August, 1895, 1 found 

 Lizzia fairly abundant in the tow-net, but no specimens were taken 

 after the second week in September. 



The following list drawn up fi-om these specimens shows the 

 increase of the tentacles ; — 



Perradial .... 1112 2121 2221 2222 2223 3332 

 Interradial.. llll' 1111' 1111' illl' llll' lllf 



At Valencia, 1895, Lizzia appeared in the tow-net a few days 

 before my departure at the beginning of June. I only obtained 

 a few specimens, which possessed the following number of 

 tentacles : — 



Perradial.... 2222 2223 3333 

 Interradial.. llll' llll' llll' 



The umbrella of the earliest stage is about 1 mm. in length and 

 nearly as wide, with a slight transverse constriction above the 

 sub-umbrella. The largest specimens are about 1^ mm. in length. 

 Nearly every specimen belonging to the early stage has medusa-buds 

 upon the stomach . One of the largest specimens taken at Plymouth 

 had a mass of ova surrounding the walls of the stomach. The 

 budding of medusso is followed by sexual reproduction, just as in 

 many other medusae. 



There are always four simple oral tentacles, each terminating 

 in a large cluster of nematocysts. I have never seen more than 

 one cluster of nematocysts upon each oral tentacle, and always 

 four single interradial tentacles. These points distinguish Lizzia 

 hlondina from Margellium octopimciatum. 



Abnormal Specimen. — An abnormal specimen was taken at Ply- 

 mouth on 31st August, 1895, with 3 radial canals, 3 oral tentacles, 

 3 groups of perradial ttntacles, with 2 tentacles in each, and 3 

 single interradial tentacles. 



Clapartide described and figured a form of Lizzia, which 

 Haeckel has regarded as a distinct species and has placed it in 

 his monograph under the name of Lizzia cluparedei. The medusa 

 has four perradial groups of two tentacles, and four single inter- 

 radial tentacles ; four simple oral tentacles, each terminating in a 

 cluster of nematocysts. Ova upon the walls of stomach. The 

 shape of the umbrella resembles that of Lizzia hlondina. 



