374 EEV. A. M. NOEMAN AND ME. G. S. BEADY 



with a spine at the base, which is about one-third the length of 

 the claw itself ; claw furnished with cilia on the edge throughout 

 two-thirds of its length. Length, ^Vfch of an inch. 



"We are indebted to Mr. D. Eobertson for the male of this 

 species, procured by him in the Paisley Canal; the carapace is 

 somewhat narrower than that of the female, the dorsal margin 

 being less arched ; the rostrum is of slightly different form, 

 blunter, and more rounded at the extremity; the anterior an- 

 tennas are rather larger, but do not appear to differ in structure ; 

 the clasping hook of the first feet has the bend more sudden and 

 less rounded than is usual in the males of the genus ; the abdo- 

 men has no marginal spines, and the terminal claws are distorted 

 and doubly berit. 



Lynceus macrourus is a lover of clear water, and though a local 

 species, is not uncommon in our lakes and large pieces of water. 

 Saddington Reservoir, Leicestershire ; Crag, Greenlea, and Grin- 

 don Loughs, Northumberland ; tarn near Stornoway, Lewis (A. 

 M. 1ST.) : Alemoor and North Shaws Lochs, Selkirkshire; Loch- 

 maben, Dumfriesshire (G. S. B.); Paisley Canal, N.B. (Mr. D. 

 Robertson). It has a continental range throughout the north of 

 Europe. 



Schoedler, in his " JVeue Beitrdge %ur Naturgescliiclite der Cla- 

 doceren, Berlin, 1863," describes four species of "Camptocercus," 

 C. macrourus, C. Lilljeoorgii, C. rectirostris, and C. biserratus, 

 but they appear to us to be nothing more than slight varieties of 

 one species. 



The species described as Lynceus macrourus by Leydig and 

 Lievin is referable to L. elongatus, and not to the true L. 

 macrourus. 



3. Lynceus elongatus, (G. 0. Sars.) PL XVIII, fig. 1; 

 and PL XXI, fig. 2. 



1820. (?) Mbnoculus striatus, Jurine. Histoire des Monocles, 

 p. 154. PL XYI, fig. 1, 2. 



1848. Lynceus macrurus, Lievin. Die Branchiopoden der Dan- 

 ziger Gegend, p. 41. PL X, fig. 1. 



