566 GILBERT C. BOURNE. 
1887, when I. C. Thompson! obtained a single female off 
Teneriffe, and soon afterwards another specimen of this genus 
was taken by the Liverpool Marine Biological Society near 
Puffin Island. Since then several specimens have been found. 
The genus is apparently fairly abundant at Jersey, and I have 
received, through the kindness of Dr. A. M. Norman, a con- 
siderable number of individuals, belonging, as will be shown 
below, to three different species, collected near the Channel 
Islands by Mr. J. Sinel. Eight specimens have been taken at 
Plymouth this year by Dr. Norman and myself, and Mr. T. 
Scott? has taken two near Inchkeith in the Firth of Forth. It 
has been found also in Lamlash Bay, Arran, and Loch Linnhe. 
Unfortunately, Thompson, in describing his Madeira specimen, 
failed to recognise its identity with Monstrilla, and not only 
described it as a new genus and species under the name of 
Cymbasoma rigidum, but has created the new family of 
Cymbasomatide for its reception. To the specimen from 
Puffin Island Thompson has given the name of Cymbasoma 
Herdmani,? and Scott’s specimens from the Firth of Forth 
and Sinel’s from Jersey have been referred to Cymbasoma 
rigidum. 
Monstrilla is a genus of such an abnormal character that I 
was led to make a careful study of my first specimen, and as 
Dr. Norman has been kind enough to forward me a number of 
specimens in his possession, together with the two specimens 
taken by Scott in the Firth of Forth, which this observer has 
kindly permitted me to use, I have been able to make out 
several features imperfectly described or overlooked by previous 
authors, and to throw some light on the systematic position of 
the genus. 
Although all the specimens of Monstrilla hitherto recorded 
1 J. C. Thompson, ‘‘ Copepoda of Madeira and the Canary Islands” ‘ Journ. 
Linn. Soe.,’ vol. xx, p. 154, pl. xiii, figs. ]—4. 
> Thomas Scott, ‘Seventh Annual Report of the Fishery Board for Scot- 
land,’ p. 316. 
° I. C. Thompson, “Second Report on the Copepoda of Liverpool Bay,” 
‘Proc. Liv. Biol. Soc.,’ ii, p. 70, pl. i, figs. 10-12. 
