1896.] BEITISH HXDHOIDS AND MBDXJSJS, 475 



Haeckel gives Corymorpha nana. Alder, as the hydroid belonging 

 to Euphysa aurata. I am still of the opinion that this is not the 

 right hydroid, as the medusae are quite distinct. 



DiSTEiBUTioN. Mediterranean, Haeckel. Atlantic, about 50 

 miles N.W. of Scotland, Maas. 



Scotland— Shetland Islands, Forbes. St. Andrews, Holt ; Craw- 

 ford. 



England — Isle of Man, Browne. 



Ireland — Valencia Island, E. T. B. 



Fam. Tiaeid;e. 



Amphinbma dinema (Peron et Lesueur). 



Oceania dinema, Peron efc Lesueur (1809) ; Eschscholtz (1829). 



Dianeea diadema, Lamarck (1817). 



Campanella dinema, Blainville (1834). 



Saphenia dinema, Porbes (1848); Peach (1849); Cocks (1849). 



Saplienia titania, Gosse (1853). 



Siomotoca dinema, Agassiz (1862). 



Amphinema titania, Haeckel (1879) ; Garstang (1894). 



At Plymouth I found this species fairly abundant during 

 September 1893. Many of the specimens which I took were 

 immature, about 1 mm. in length. One specimen measured 3 mm. 

 in length and 2 mm. in width. The tentacles of this medusa are 

 able to expand to a great length, often to ten times the length of 

 the umbrella. The larger specimens have about two dozen minute 

 marginal bulbs. Stomach yellowish brown. The base of the 

 tentacles is of a crimson or purplish colour. 



I again took a few specimens at Plymouth during September, 

 1895, but not so many as in 1893. 



DiSTRiBtFTioN. Scotland — Shetland Islands, Forhes. 



England — Portland, Forbes. Plymouth, Garstang ; E. T. B. 

 Cornwall, Forbes. Powey, Peach. Falmouth, Codes. Ilfracombe, 



Fam. Mahgeilidjb. 



LizziA BLONDiNA, Forbes. 



Lizzia blondina, Forbes (1848) ; Peach (1849) ; Haeckel (1879) ; 

 Mcintosh (1890) ; Vallentin (1893) ; Browne (1895). 



Lizzia claparedei, Claparede (1860) ; Haeckel (1879). 



Dysmorphosa minima, Haeckel (1879) ;lBrovrae (1895). 



The specimens taken at Plymouth in 1893 and 1895, and at 

 Valencia in 1895, clearly show that the earliest stage is similar to 

 the medusa described by Haeckel as DysmorpJwsa minima. The 

 chief difference between Dysmorphosa minima and Lizzia blondina 

 exists in the number of tentacles, which increase in number 

 during the growth of the medusa. 



Dysmorphosa minima has four single perradial tentacles and 

 four single interradial tentacles. 



