1G8 BRITISH ENTOMOSTRACA. 



they may be seen to fall in gyrations to the bottom, with- 

 out ever attempting to dart through the watery element, 

 as is the case with the Cy prides. Upon reaching the 

 bottom, they open their shells and creep along the surface 

 of the glass ; but wdien touched or shook, they immediately 

 again withdraw themselves within their shell, and remain 

 motionless. This inability to swim is no doubt owing 

 to the want of the pencils of long hairs or filaments which 

 adorn the superior and inferior antennae of the Cyprides, 

 and which we have already seen are the organs by means 

 of which they swim. My opportunities for observing 

 these tiny animals have been so limited, and the difficulty 

 of keeping them alive, from the rapidity with which sea- 

 water becomes putrid when kept in a room in a small 

 vessel, is so great, that I cannot make any additional 

 statements respecting their economy or habits. The 

 species, however, are undoubtedly numerous, and the 

 labours of any inquirer after them would assuredly be 

 rewarded with much success. 



1. Cythere flavida. Tab. XXI, figs. 12, 12 «. 



Cythere flavida, Muller, Eutomost., 6G, t. 7, f. 5, 6, 1781. 



— Latreille, Hist. Nat. Crust., iv, 253. 



— Desmarest, Consid. gen. et part. Crust., 388. 



— Bosc, Mau. d'Hist. Nat. Crust., ii, 284. 



— Beard, Mag. Zool. and Bot., ii, 142 ; Trans. 



Berw. Nat. Club, ii, 153. 

 MoNOCULUS FLAViDUS, Gmeliii, Liuu. Syst. Nat., 3001, No. 33. 



— Fabricius, Eut. Syst., ii, 494. 



— Mamiel, Enc. meth., vii, 725, t. 266, f. 10, 11. 



— Rees, Cyclopaed. art. Monoculus. 



Shell oblong, narrow, anterior extremity more acute 

 than posterior; smooth, shining, of a pale yellow horn 

 colour, and transparent. Inferior margin nearly straight ; 

 superior arched. 



Hah. — Among Confervse in pools of sea- water at Cocks- 

 burnspath, Berwickshire, 1835. In sand, from Torquay; 

 W. C. AVilhamson, Esq. 



