OSTRACODA NEW TO BRITAIN. 105 
specimens of C. fusca, when steeped in solution of potash, impart 
to the liquid a beautiful purple colour. I have not noticed this 
with other species, but should suppose it likely to occur when a 
sufficiency of brown pigment exists in the shell. 
The engraver has made the figures (1 & 2) too broad in pro- 
portion to their length. 
Cypris oblonga was taken in a pond at Fenham, near New- 
castle, in April, 1863. 
Cypris sTRIOLATA, n. sp. (PI. II., figs. 12-17.) 
Valves broadly subreniform; dorsal margin greatly arched ; 
ventral margin slightly sinuated; anterior and posterior 
margins obtusely rounded; the highest part of the cara- 
pace somewhat behind the middle. Viewed from above, 
the carapace is much compressed, and tapering towards 
the extremities, of which the posterior is more obtusely 
rounded than the anterior. Surface of the valves smooth, 
and regularly marked with beautifully fine, anastomosing, 
longitudinal striations. Colour deep brown. Length 
reo Inch; height ,2, inch. 
This approaches very closely to C. compressa; and, except in 
the sculpturing of the carapace (which is very well-marked and 
characteristic) and the sinuation of its lower margin, I cannot 
find any feature which distinctly separates it from that species. 
The valves of C. compressa are more or less deeply pitted; and 
in no instance have I been able to find any trace of the striation 
which distinguishes the present species. The general contour 
of C. striolata is more nearly reniform, the lower edge being 
decidedly sinuated, and the extremities are not quite so abruptly 
rounded. It is also larger tnan C. compressa. 
Habitat. Broomley Lough, Northumberland. April, 1863. 
Cypris AFFINIs, Fischer. (Pl. II., figs. 6-11.) 
Cypris affinis, Fischer, Mémoires des Savants Etrangers, St. Peters- 
burgh, vol. ii. p. 146, pl. 4. f. 1-11; Lilljeborg, De Crust, ex. ord. 
tribus Cladocera, Ostracoda, et Copepoda in Scania occurrentibus, 
p./116, pl. 11.,f, 8-14. 
