J60 iin. E. T. TinowNE ow [Mar. 17, 



Leftomedus^. 



ThaumantiaB hemispboerica, p. 480. 

 Laodice cruciata, p. 482. 

 Euchilota pilosella, p. 484. 

 Epenthesis cymbaloidea, p. 487. 

 Phialidium variabile, p. 487. 

 Fhialidiiini buskiununi, p. 488, 



Phialidium temporarium, p. 489. 

 Phialidium cymbaloideum, p. 491. 

 Eutima insignia, p. 492. 

 Saphenia mirabilis, p. 493. 

 Octorchis gegenbauri, p. 494. 



Traciiomedus^b. 

 Liriantha appendiculata, p. 495. 



NABCOMEDDSiE. 



SolmariB, sp. ?, p. 496. 



Intboduotion. 



These notes refer chiefly to Medusae taken at Plymouth during 

 September 1893, and from the middle of August to the end of 

 September 1895, and also during April and May 1895, in Valencia 

 Harbour, on the West Coast of Ireland. 



I published, last year, a few notes on the MedusjB taken at Port 

 Erin, Isle of Man, and have avoided in this paper, so far as possible, 

 a repetition of those notes, but have revised the nomenclature in a 

 few cases. I have not yet made sufficient progress with the study 

 of our Medusse to justify the publication of anything more than 

 a few selected notes on the species which are best known to me. 



The double system of classification, with one name for the 

 hydroid and another for the medusa, I no longer intend to use. 

 In cases where the hydroid form of the medusa is known I have 

 used both the generic and specific names of the hydroids, without 

 any alteration ; but in cases where the medusa only is known I 

 have given the generic names as used by Haeckel in his monograph, 

 but not always his specific names. It is my intention to transfer 

 these medusae to their hydroid names as soon as the hydroid forms 

 are discovered. 



In some instances the free-swimming medusa has been desci-ibed 

 before the hydroid form was known, but I do not feel justified 

 in changing the specific names of the hydroids, which are now 

 so well known, as it would lead to a considerable amount of 

 confusion. 



The introduction of formaldehyde as a preserving fluid instead 

 of alcohol is of great importance to the marine naturalist, especially 

 when working in localities where it is difficult to obtain a supply 

 of good spirit. I first tried formaldehyde for preserving marine 

 animals at Valencia last year. The results both for hydroids and 

 medusae were far superior to those obtained by means of alcohol. 

 The colour, however, is not permanently preserved. Specimens 

 preserved in formaldehyde, even when killed with the usual re- 

 agents, are practically useless for histological work. The best 



