CYPRIS. 125 



1853. Cypeis vieens, LilJjehorg. De Crustaceis ex ord. trib., p. 117. 



1868. — — Brady. Monog. Recent Brit. Ostrac, p. 364, pi. xxiii, figs. 



23—32, and pi. xxxvi, fig. 1. 



Carapace, as seen from the side, oblong, reniform ; extremities rounded and nearly 

 equal, superior margin evenly arched, highest in the middle, height equal to more than 

 half the length ; inferior gently sinuated, seen from above oblong, ovate, pointed in 

 front, narrowly rounded behind; greatest width situated in the middle, and equal to 

 about half the length. Shell thin, slightly punctate or perfectly smooth ; in recent 

 specimens greenish and slightly pubescent. 



Length, Yjth of an inch. 



Distribution. Becetit. — Great Britain, Sweden, Switzerland, Bohemia. 

 Fossil. — Crofthead, Scotland. 



Though a common species in most parts of Great Britain at the present time, we 

 have met with very scanty traces of C. virens in the fossil condition ; indeed, for this 

 reason we have been compelled to give figures and description from recent specimens, 

 our fossil examples consisting of mere fragments, which, however, we can scarcely doubt 

 are rightly referred as above. It is remarkable that a species so abundant in the recent 

 state should be so poorly represented in the later lacustrine and fluvial deposits ; perhaps 

 an explanation may be found in the fact that C. virens chiefly haunts small grassy pools 

 and ditches, and, so far as our experience goes, is pretty much absent (except at the 

 grassy margins) from those larger expanses of water whose deposits are most likely to 

 come under the observation of the palaeontologist. These remarks apply equally to some 

 other species, e.^. C. reptans and Candona Candida. 



4. Cypris ovum {Jurine). Plate I, figs. 29 — 31. 



1820. MoNocuLus OVUM, Jurine. Histoire des Monocles, p. 179, pi. xix, figs. 18, 19. 

 1850. Cypris MiNfTA, Baird. Brit. Entom., p. 155, tab. xviii, figs. 7, 8. 

 1868. — OVUM, Brady. Monog. Recent Brit. Ostr., p. 373, pi. xxiv, figs. 31 — 34, 



43 — 45, and pi. xxxvi, fig. 8. 



Carapace, as seen from the side, subovate, highest in the middle, height equal to two 

 thirds of the length ; extremities well rounded, the anterior much the Avider, superior 

 margin very boldly arched, sloping more steeply behind than in front, inferior almost 

 straight ; seen from above ovate, tapered and acuminate in front, broadly rounded behind, 

 greatest width situated near the middle, and slightly exceeding half the length. Surface 

 smooth, closely set with minute round punctations. Colour light brown. 

 Length, :^th of an inch. 



Distribution. Becent. — Great Britain, Switzerland. 



Fossil. — Whittlesea ; Cardiff". 



