CYPRIS. 153 



and beset all round with dense, fine, short hairs. The 

 colour is a dull white, and the valves are distinctly marked 

 with three black, somewhat waved fascise, running trans- 

 versely across the shell at unequal distances, the most an- 

 terior of the three being the smallest. Posterior margin 

 rather narrower than anterior.* 



Hah. — Neighbourhood of London, Rugby, &c. &c. ; 

 common during the summer months. 



3. Cypms monacha. Tab. XVIII, fig. 6. 



Cypris monacha, Midler, Zool. Dan. Prod., No. 2390, 1776; Ento- 

 mostraca, 60, t. 5, f. 6-8. 



— Latreille, Hist. Nat. Crust., iv, 247. 



— Bosc, Mau. d'Hist. Nat. Crust., ii, 297. 



— Desmarest, Consid. geu. et part, des Crust., 384, 



t. 55, f. 7. 



— Baird, Mag. Zool. and Bot., i, 133, t. 5, f. 2 ; Trans. 



Berw. Nat. Club, ii, 152. 



— M. Edwards, iii, 397. 



— Koch, Deutsch. Crustac, h. ii, t. 1. 

 MoNOCULUS MONACHUS, Gmelin, Linu. Syst. Nat., 3003, No. 44. 



— Manuel, Enc. meth., vii, 727, No. 41, t. 266, 



f. 34-36. 



— Fabricius, Ent. Syst., ii, 497. 



— Rees, Cyclopsed., art. Monoc. 



— Jurine, Hist. Nat. Monoc, 173, 1. 18, f. 13, 14. 

 Ci'PBis NUBiLOSA (?), Koch, Deutsch. Crustac, h. xii, t. 4. 



Shell of a rhomboidal form, rounded at posterior margin, 

 and truncated as it were anteriorly ; glabrous, with a few 

 hairs on posterior margin. The surface of the shell is re- 

 ticulated, or, as Miiller says, marked with small points 

 impressed into, or as it were excavated out of, the shell. 

 The upper part is nearly of a white colour, while the lower 

 portion of anterior margin, and part of posterior, are very 

 dark, shaded with a yellow green. The filaments of pos- 

 terior antennae are long. 



A very pretty and well-marked species. 



* It is not so narrow at the posterior extremity as is represented by 

 Jurine. Miiller's figure represents the anterior extremity as the narrower. 



