Mr. G. S. Brady on new British Species of Ostracoda. 59 



Fig. 4. Ditto of Hyema striata, Zimmerm. ; three-quarter view, to show 



the anterior tubercle. 

 ligs. 5, 6, 7. Ditto of Hyana antiqua, Lankester. Red Crag, Suffolk. 

 Fiff. 8. Ditto of Hycena striata, Zimmerm. View of the crown of the 



tooth. 

 Fiff. 9. Ditto of Hycena crocuta, Bodd. 



VIII. — On Species of Ostracoda new to Britain. 

 By George S. Brady. 



[Plates III. & IV.] 



The 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. Cypridae. 

 Subfam. 1. CYPRIN.E (Dana). 

 Genus Cypris, Miiller. 

 Cypris ohlonga, 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 -j^^ inch ; height -j-^ 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 

 (PI. III. figs. 4 & 5). The "lucid spots" are much larger and 

 more distinct in C. ohlonga. 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. 



