398 REV. A. M. NORMAN AND MR. G. S. 13RADV 



or posterior view, the outline is seen to be beautifully emarginate 

 or fluted. 



Lynceus nanus delights in the purer water of the large ponds 

 and of lakes. In such situations we have found it to be generally 

 diffused in the counties of Durham, Northumberland, Kirkcud- 

 bright, Dumfries, Selkirk, Ross, and in Connemara. Sars meets 

 with it in Norway, Lilljeborg in Sweden, and Schoedler in 

 Prussia. 



19. Lynceus globosus, {Baird). PI. XX, fig. 5. 



1850. Chydorus globosus, Baird. Brit. Entom., p. 127. PL 

 XVI, fig. 7. 



1853. Lynceus globosus, Lilljeborg. De Crust, ex Ord. tribus 

 Clad. Ostrac. et Copep., p. 85. PL VIII, fig. 1. 



1860. Lynceus globosus, Leydig. Xaturges. der Daphniden, p. 

 230. 



1863. Chydorus globosus, Schoedler. Neue Beitrage zur Xatur- 

 ges. der Cladoc, p. 13. 



1863. (?) Chydorus ccelatus, Schoedler, 1. c, p. 15. PL II, 

 fig. 44. 



Carapace quite globular, the posterior extremity completely 

 rounded with the ventral and dorsal margins ; ventral margin 

 having a row of cilia which take their origin a little within the 

 edge of the shell ; valves having a dark brown stain in the centre, 

 hexagonally reticulated, the reticulations are apparently scaly 

 processes, and towards the ventral margin the raised edges of 

 these scales, being more conspicuous, present the appearance 

 (under a lower power of the microscope) of waved circular stria- 

 tions and small black spots, as described by Dr. Baird. Head 

 depressed, produced into a very long and slender rostrum which 

 is curved downwards ; anterior antennae short and thick. Eye- 

 spot not half the size of the eye. Abdomen short and narrow, 

 nearly parallel-sided, superior margin slightly sinuated toward 

 the extremity; posterior angle distinct, much produced, marginal 

 teeth, about eighteen in number, extending round the posterior 



