444 D. J. SCOURFIELD, SYNOPSIS OF THE KNOWN SPECIES OF 



Graptoleberis Sars. 



G. testudinaria (Fischer). 



Lynceus testudinarius Norman & Brady (17). 



Alonella Sars. 

 A. excisa (Fischer). 



Lynceus exiguus Norman &: Brady (17) (probably). 

 A. exigua Scott (20, 21, 21A, 23), Sprague (33), Hodgson (10). 

 This is the commonest of the genus in this country. 



A. exigua (Lilljeborg). 



? Lynceus exiguus Norman &, Brady (17) (in part). 

 This seems to be a very rare British species. 1 have only seen 

 it once— from the Water-lily pond in Kew Gardens last year (32) 

 — and I know of no other certain records. Mr. T. Scott's 

 records of A. exigua really refer to A. excisa. See his remarks in 

 (20) Part IX., p. 201. 



A. nana (Baird). 



Acroperus names Baird (1). 



Lynceus lumus Norman & Brady (17). 

 A pretty common and widely distributed species. It is the 

 smallest Entomostracon known at present. 



Peratacantha Baird. 



P. truncata (0. F. Miiller). 



Peracantha truncata Baird, etc. 



Lynceus truncatus Norman & Brady (17). 



Pleuroxus Baird 

 P. laevis Sars. 



Lynceus laevis Norman k Brady (17). 



P. trigonellus (0. F. Miiller). 



Lynceus trigonellus Norman k Brady (17). 



P. uncinatus Baird. 



Lynceus uncinatus Norman & Brady (17). 



