Mr. G.S. Brady on new British Species of Ostracoda. 59 
Fig. 4. Ditto of Hyena striata, Zimmerm.; three-quarter view, to show 
the anterior tubercle. 
Figs. 5, 6. 7. Ditto of Hyena antiqua, Lankester. Red Crag, Suffolk. 
Fig. 8. Ditto of Hyena striata, Zimmerm. View of the crown of the 
tooth. 
Fig. 9. Ditto of Hyena crocuta, Bodd. 
VIII.—On Species of Ostracoda new to Britain. 
By Grorce S. Brapy. 
[Plates III. & IV.] 
Tue following species of freshwater Entomostraca have been 
taken during the present year in the counties of Northumberland 
and Durham. One of them (Cypris affinis) is a Continental 
species, not heretofore recorded as a native of Britain. The rest 
are now for the first time described. To these descriptions I 
have appended a few notes on the animal of Cyprideis torosa 
(Jones), and on its occurrence in a recent state in this district. 
Fam. Cypride. 
Subfam. 1. CYPRIN AN (Dana). 
Genus Cypris, Miller. 
Cypris oblonga, n. sp. PI. III. figs. 1-4. 
Elongate, subreniform ; lower margin slightly sinuated; upper 
edge considerably arched, highest in the middle; extremities 
rounded, the posterior being the more obtuse. Seen from 
above, the carapace is ovoid in shape, the junction of the 
valves forming, toward the extremities, a well-marked keel, 
which is most prominent anteriorly. The valves are clothed 
with a few scattered hairs, and marked irregularly with one 
or more transparent patches, which appear light or dark 
according to the mode of illumination. Colour light brown. 
Length ;48, inch; height ;24, inch. 
This species is nearly allied to C. fusca, which differs from it 
in being broader and more tumid, as well as in the surface- 
markings. The abdominal rami of the two species are also dif- 
ferent, as may be best seen by a comparison of the figures 
(Pl. III. figs.4.&5). The “lucid spots” are much larger and 
more distinct in C. oblonga. It is perhaps worthy of notice that 
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 where 
a sufficiency of brown pigment exists in the shell. 
Cypris oblonga was taken in a pond at Fenham, near New- 
castle, in April 1863. 
