'Bb.ownh— Fauna and Flora of Valencia Marhour, Ireland. 731 



represent the primary series, and tend to show that the Medusa 

 at a veiy early stage has only eight simple tentacles (four 

 perradial and f oiu' interradial) ; then the second series develops, 

 forming eight groups of two tentacles each; and a little later, 

 a third series appears, forming three tentacles in each group 

 (Gosse's G. corynetes). The next series consists of eight isolated 

 adradial tentacles, separated from the groups by sense-organs, 

 and about midway between the groups (Haeckel's G. circinata). 

 Some of the Yalencia specimens, as already stated, have other 

 very minute tentacles, which are irregular in position, and 

 usually sepai-ated by sense-organs from the other tentacles. 

 One specimen had as many as ten just budding out, without 

 bands of nematocysts. All the tentacles are built on the same 

 principle, differing only in size and in the number of rings of 

 nematocysts upon them. In the largest tentacles about fifty 

 conspicuous circular bands of nematocysts are present, and a 

 large terminal cluster ; in the smaller tentacles only one or two 

 bands are usually present. The tentacles, when partly con- 

 tracted, have the appearance of clubs, as figured by Gosse ; 

 hence his specific name. 



The sense-organs are not very regular in position. There are 

 either two or three together in a group ; but the groups become 

 separated in some of the specimens by the development of the 

 tiny tentacles. The number of sense-organs is not quite con- 

 stant. I counted twenty-nine in one specimen, and they were 

 divided into the following gToups by the tentacles : — 3, 4, 4, 4, 

 2, 4, 4, 4. In another specimen, with twenty-four sense- 

 organs, the numbers ran thus : — 3, 3, 3, 4, 3, 3, 2, 3. Each 

 sense-organ contained a single otolith. 



The smallest specimen measured 5 mm. in length and 7 mm. 

 in width ; the largest 8 mm. by 12 mm. 



The Misses Delap inform me that this Medusa is a strong and 

 rapid swimmer. The coloui- of the stomach is greenish ; the 

 mouth, gonads, and tentacles pinkish. 



Haeckel foiond his specimens at Croisic, near St. Nazaire, 

 South Brittany. 



E.T.A. PKOC, SER. Til. VOL. V. 



