64 COPEPODA AND OTHER CRUSTACEA TAKEN IN IRELAND 



Genus MONSTRILLA, Dana. 



? Monstrilla grandis, Giesbrecht (PI. IV., figs. 1-3). 



1892. Monstrilla grandis, Giesbr., Pelagischen Copepoden 



des Golfes von Neapel, pp. 586, 



588. 

 1894. „ „ . Timm, Copepoden undCladoceren 



der siidostlichen und ostlichen 

 Nordsee, p. 378, pi. V., fig. 4. 



The single specimen here referred to is so much battered 

 and mutilated that it would be useless to attempt a descrip- 

 tion. The separate parts are as far as possible figured in PI 

 IV. I scarcely doubt that it belongs to Monstrilla gra7idis, 

 Giesbrecht, though it might also fairly be referred to M. 

 intermedia, Kritchagin, which is possibly identical with M. 

 grafidis. No example of this extremely interesting genus has, 

 so far as I know, been hitherto found on the East Coast of 

 Britain, though it occurs not very uncommonly in the English 

 Channel {M. anglica, Lubbock), and on the eastern part of 

 the North Sea at Heligoland {M. helgolandica, Claus). I am 

 indebted to my friend I. C. Thompson, Esq., F.L.S., of Liver- 

 pool, for specimens of another genus {Thatimaleus Thompsoni, 

 Giesbrecht) which is scarcely distinguishable from Monstrilla. 

 This species seems to be widely distributed — Isle of Man, 

 Falkland Islands, Mediterranean. In the year 1880 when my 

 Ray Society " Monograph of the British Copepoda " was 

 published I had not seen any specimen of either genus. Sir 

 John Lubbock had described his Monstrilla anglica from a 

 single specimen which had unfortunately been lost, and I had 

 to be content with reproducing his drawing of that species. 

 Since that time several other species belonging both to 

 Monstrilla and Thaumaleus have been described by Mr. 

 Bourne and Mr. Thompson in this country, and by Giesbrecht, 

 Timm, and others abroad. It was early noticed that the 

 animals, though extremely muscular and powerfully limbed, 

 were entirely destitute of alimentary canal and mouth-organs, 

 the mouth being represented at the most by a very small 



