698 Proceedings of the Royal Irish Academy. 



and of the three Valencia species — Aglantha o'osea, Gossea circinata, 

 and Liriantha appendiculata — only the latter has occurred at Plymouth ; 

 it was very abundant there in 1893, and a few in 1897. Until I found 

 this species at Yalencia, the English Channel, where it was fii'st 

 found by Forbes in 1846, was its only known habitat. Only a few 

 specimens were taken at Yalencia in 1896 and 1897. Apparently it is 

 an occasional visitor to our shores. Aglantha is a typical Atlantic 

 Medusa. It was taken at Yalencia in 1895 and 1896, and has been 

 recorded from the Shetlands, St. Andi'ews, and Heligoland. Gossea 

 circinata, the rarest of the Yalencia Medusae, has only been taken at 

 Croisic, on the coast of Normandy, unless it be ultimately proved that 

 Gossea corynetes of Gosse, taken at Ilfi'acombe in 1852, and not since 

 recorded, be a younger stage. Both species of this genus may be 

 regarded as typical visitors to the British shores. 



Sohnaris corona was the only species of the Narcomedusse which 

 was taken at Yalencia; it was very scarce in 1895-96, but abundant 

 in 1897-98. At Plymouth, in September, 1895, I found two young 

 stages of a Sohnaris, which may belong to this species. 



Amongst the Scyphomedusse, Pelayia perla may be regarded as an 

 Atlantic species, which arrives at times in shoals on the west coast of 

 Ireland and Scotland. It has never been recorded for Plymouth. 

 Forbes, however, found specimens off the coast of Cornwall in 1846. 



None of the Trachomedusse or Narcomedusae, nor Pelagia,^ have 

 been recorded for the Isle of Man. It will be seen that the majority 

 of the species found in Yalencia Harbour occur at Plymouth and Port 

 Erin, and the remainder mark the character of an Atlantic port, viz. : 

 Dipleurosoma, Laodice, Polycanna, Aglantha, Solmaris, and Pelagia. 

 With tow-netting carried on almost continuously for three years, I 

 expected to find more Atlantic Medusae than have been met with. 



Notes on the Tables. 

 (Tables facing p. 736.) 



The Yalencia Medusae are conveniently divided into thi-ee series, 

 corresponding to the three tables placed at end of this Eeport. 



Table I. — The fijrst series is quite distinct, and contains only those 

 Medusae taken by me during April and May, 1895. 



Table II. — The second series contains the results of my tow-nettings 

 during the summer (July to September), 1896. 



1 Pelagia perla. A shoal at Port Erin early in October, 1899. Chadwick, 

 H. C. 13th Ann. Rep. L. M. B. C, p. 34. 



