Browne — Fauna and Flora of Valencia Harbour, Ireland. 715 



for there being two specific names, one for tlie Hydroid and 

 another for the Medusa, and according to the rules of nomen- 

 clatui-e Hincks's name has priority. 



Hincks states that the Hydroid is not common. It is 

 recorded for Pegwell Bay, near Eamsgate ; Dorsetshire ; Ilfi'a- 

 comhe ; Kinsale, Co. Cork ; Courtmasherry Harbour, Cork ; 

 and Jersey. 



Dipleurosoma typicura (Boeck). 



Bipleurosoma typica, Axel Boeck, 1866. 



Dipleurosoma stuvitzii, Axel Boeck, 1866. 



Ametrangia hemisphcerica, Allman, 1873, "Nature," toI. ix., p. 73. 



Dipleurosoma irregulare^ Haeckel, 1879, p. 636. 



Dipleurosoma typicum, Haeckel, 1879, p. 155. 



Dipleurosoma hemispherica^'KaiM.oTi., \%%b ) Browne, 1897, P.Z.S., 

 p. 826, pi. xlviii. 



In 1895, a solitary specimen was taken in April, and a few 

 in May. 



In 1896, only three specimens were taken during August. 

 In 1897, a single specimen was taken on June 30th, and on 

 July 1 9th a great shoal appeared, and remained in the harbour 

 until the middle of August. A great decrease took place early 

 in September, and the final disappearance on October 9th. The 

 smallest specimens were about 3 mm. in diameter, and the 

 largest did not exceed 8 mm. 



In 1898, it first appeared in May and disappeared in October. 

 Abundant during June and July. 



The few specimens taken in 1895 and 1896 showed that this 

 Medusa had a very irregular radial canal system. Though I 

 was able to identify the specimens as Ametrangia hemisphcerica 

 of Allman, yet I felt sui'e that the species had not been cor- 

 rectly described. Fortunately the Medusa was abundant in 

 1897 and 1898, so that the Misses Delap were .able to send me 

 a large number of specimens, which have enabled me to give a 

 better description of the radial canal system, and to connect 

 Allman's species with Dipleurosoyna typicum of Boeck. AUman's 

 specimens were taken on the south coast of Ireland, and the 

 following is his description (from "Nature," 1873): — 



"Umbrella hemispherical, about half an inch across the 

 umbrella-margin. Tentacles more than a hundi'ed, very exten- 



K.I.A. PEOC, SEE. III., VOL. V. 3 » 



