448 ACALEPHA. 



Genus SaksIA. 

 S. tuhulosa, Lesson. 



Jpril 18, 1840. — I had the satisfaction to-day of identifying with this 

 sjjecies a Medusa, of which several individuals were brought to me by Mr. 

 Hyndman, just after their capture in Belfast Bay. On calling the attention 

 of Mr. R. Patterson to them, a^reference to his notes on 3Ieduscs showed 

 that he had procured the same species at Larne (County Antrim), in May, 

 183-5, and June, 1838; and again at Bangor (County Down), in July, 

 1839. As my friend could not find the species described — Sars' work he 

 had not for reference — he drew up a detailed and interesting account of 

 the animal, accompanied by several characteristic sketches of it in various 

 positions. 



Having remarked that one of my specimens, which was in a phial con- 

 taining H ounce of sea-water, appeared as lively after four days' captivity 

 as at first, although the fluid had not been changed, nor any nutriment 

 added, I, before leaving home for some days, handed it over to Mr. Pat- 

 terson, that the period the animal would live under such circumstances 

 might be noted. From him I leai'n that this individual lived thus for 

 twelve days (from the 18th to the 30th of April), and that for the first 

 ten it retained its ordinary vivacity. 



Genus Oceania. 

 O. imjnllcda, Miill. 



Of this very minute species, 1^ line in diameter, a specimen occurred to 

 me in Strangford Lough in October. 



Genus THAUMANTIAS. 

 T. hccmisphcsnca, MiUl. 



On October 5, 1838, I obtained one of these Medusce in Belfast Bay, 

 and a day or two aftei'wards many specimens were brought me by Mr. 

 Hyndman from the same locality. In size they rather exceeded MiiUer's, 

 measuring 5 lines in diameter in their most depressed state. This and 

 the preceding species were determined from accurate drawings taken of 

 the living animals. Mr. R. Patterson informs me that he obtained the 

 P. hcBmispharica at Larne in the summer of 183o. 



T. j)ileata, Forbes. 

 North of Ireland, at Portrush, Smith and Forbes. 



T. Thompsoni, Forbes. 

 West and South of Ireland. 



Genus Ephysa. 

 E. simplex, Penn. 

 North of Ireland. 



" Probably, as Cuvier suggests, some species in a mutilated state, " 

 Professor E. Forbes. 



E. h<emisph<Brica, Temjileton. 

 North of Ireland. 

 " Perhaps a young state of Aurelia," Professor E. Forbes. 



