1904 - 5 .] Report on Medusae found in Firth of Clyde. 
739 
Introduction. 
Records relating to the occurrence of medusae in the Firth of 
Clyde have not been numerous, though its waters have long been 
a noted resort for marine naturalists. Forbes, in his Monograph 
on the British Naked- eyed Medusae, states that he paid special 
attention to the medusae of the Clyde, and that those which he 
collected while on a yachting cruise in the autumn of 1839 were 
the foundation of his well-known monograph. Amongst those 
who have made additions to the list of species I may mention the 
names of Landsborough, Alder, Allman, Herdman, and two well- 
known foreigners, Claparede and Haeckel. In June 1902 Dr 
Clemens Hartlaub, of Heligoland, made a short stay at the 
Millport Biological Laboratory, solely for the purpose of collecting 
medusae, but the complete results of his labours have not yet 
been published. 
Early in the year of 1901 I arranged with Mr Alexander Gray, 
who was then the curator of the Biological Laboratory at Millport, 
but is now residing in New Zealand, to take for me a series of 
tow-nettings in the Firth of Clyde. The main object which I 
had in view was to become acquainted with the medusae of the 
Clyde before beginning work on the group at the Laboratory in the 
autumn. 
I* asked Mr Gray to take one or two tow-nettings every week, 
and to preserve the whole contents of the net in formalin. This 
series of tow-nettings was begun on 11th April, and was continued 
to 31st July. A second series of tow-nettings was taken during 
my stay at the Biological Laboratory from 17th September to 23rd 
October. 
Whilst at the station in 1901 I arranged with Mr Gray for a 
more extensive programme of work for 1902. He willingly 
agreed to take a tow-netting once a week from January to 
December, in order that the seasonal changes in the plankton 
might be observed. Just as in the previous year, the plankton 
was sent to me in formalin. After I had removed the medusae 
and noted the occurrence of some of the other animals (see pages 
779-91), the bottles were sent to Dr Thomas Scott at Aberdeen, 
who had kindly undertaken the determination of the Crustacea. 
