114 



LIST of the MEDUSyE and CTENOPHORA of the 

 L. M. B. C. DISTRICT. 



By J. A. Clubb, 



ASSISTANT IN THE ZOOLOGICAL LABORATORY, UNIVERSITY COLLEGE, LIVERPOOL, 



The Medusoid Gonophores enumerated below were all, with 

 the exception of Thaumantias convexa, and the species 

 recorded by Mr. Byerley, collected by Professor Herdman off 

 the south end of the Isle of Man, during July and August, 

 1885. Thaumantias convexa was taken by Mr. I. C. Thomp- 

 son off Penmaenmawr, in July. The true Medusae and the 

 Ctenophora were obtained at the mouth of the Mersey. 



The method of preservation adopted in the case of the 

 Isle of Man specimens was as - follows : — The tow-net was 

 inverted in a large jar, containing about a gallon of salt 

 water, to which about five or six grains of picric acid was 

 added. The Medusoid Gonophores, and other organisms, 

 which settled in a layer at the bottom of the jar, were shortly 

 afterwards removed from the solution, and placed in weak 

 alcohol. In the case of many of the Medusoid Gonophores 

 so treated, there was found to be considerable contraction, 

 especially of the tentacles, and the colour was always obli- 

 terated by the yellow staining due to the picric acid. Hence 

 there is considerable difficulty in identifying them, and, 

 in a few cases, the specimens are in such a condition that 

 the species cannot be satisfactorily determined. 



The specimens have been examined and identified in the 

 Laboratory, under the direction of Professor Herdman ; and I 

 have followed the nomenclature given by Professor Edward 

 Forbes in his '' Monograph of the British Naked-eyed 

 Medusae," Ray Society, 1848. 



