190 6- 1907.] Copepoda living as Messmates with Ascidians. 371 



does not seem to be any published record of its occurrence in 

 the Firth of Forth. The Rev. A. M. Norman obtained it in 

 Asciclia mentula dredged in Shetland : he has also found it at 

 Oban, and at Plymouth in Phallusia mamillata ; and Dr Brady 

 records it from Mulroy Lough, Donegal. 



Lichomolgus furcillata Thorell has been obtained very spar- 

 ingly in large Ascidians dredged in the Firth of Forth ; and 

 Dr Brady found the same species in the branchial sac of 

 Corella parallelogramma sent to him from Shetland by the 

 Rev. A. M. Norman, who has also dredged it near Eddy stone 

 Lighthouse. It is also recorded from Port Erin, Isle of Man, 

 by the late I. C. Thompson, Liverpool. 1 



Lichomolgus albens Thorell. — I know of only two records of 

 this species from British waters. The first in point of time is 

 that published by the late I. C. Thompson, who found the 

 species among algaa on rocks at Puffin Island off the coast of 

 Anglesea; 2 the second mentions its occurrence in dredged 

 material from Otter Spit, Loch Fyne ; 3 but in neither case were 

 the specimens found as messmates of Ascidians. Dr Canu, 

 however, referring to this species, says : " Dans le Boulonnais 

 je l'ai trouvee habitant la cavite peribranchiale et le cloaque de 

 diverses Ascidies : Ciona intestinalis Mueller, Molgula socialis 

 Alder, Cynthia lurida Thorell." 



Lichomolgus Poucheti Canu, another species sometimes found 

 associated with Ascidians, has not yet, so far as I know, been 

 obtained in British waters. Dr Canu, the describer of the 

 species, says that it is moderately rare, and that he found it 

 in the Bay of Concarneau living as a semi - parasite with 

 Morchellium argus and Fragrarium areolatum — two species 

 belonging to that group of the Tunicata known as Social 

 Ascidians. 



And now, in bringing these observations to a close, I 

 have only to add that though much still remains to be done 



1 "Revised Report on the Copepoda of Liverpool Bay," ' Trans. Liverpool Biol. 

 Soc.,' vol. vii. p. 33(1893). 



2 Ibid. 



3 "Some Additions to the Invertebrate Fauna of Loch Fyne," by T. Scott, 

 'Sixteenth Annual Report Fishery Board for Scotland,' Pt. III., p. 269 (1898). 



