108 MR. G. 8S. BRADY ON SPECIES OF 
Suscenus CYPRIDEIS, Jones. 
CyprIpEIs Torosa, Jones. (PI. III., figs. 11-23.) 
Cyprideis torosa, Jones, Entomostraca of the Tertiary Formation of 
England, 1856, p. 21, pl. 2. figs. 1 a-1 i, and woodcut, fig. 2, p. 16. 
Candona torosa, Jones, Ann. & Mag. Nat. Hist. ser. 2, 1850, vi. p. 27, 
pl. 3. fig. 6. 
Valves oblong, convex, somewhat broader in front than be- 
hind. Ventral margin straight, or with a very slight 
sinuation, frequently furnished with a single stout spine at 
the posterior angle; dorsal margin arched, higher ante- 
riorly. Hinge-margin of the right valve bearing a series 
of corrugations or elongated tubercles, which are received 
into corresponding depressions of the opposite valve. 
Extremities obtusely rounded. The right valve is smaller 
than the left, and has the dorsal margin inclined more 
steeply, and almost in aright line, from before back- 
wards. “Surface of the valves marked with closely- 
set angular pittings,” and with a more or less conspicuous 
transverse sulcus somewhat in front of the centre. Young 
specimens are sometimes furnished also with a few short, 
thinly scattered hairs, and at the postero-inferior angle, 
near the spine before mentioned, there is often a con- 
spicuous group of rather long hairs. Lucid spots arranged 
in a transverse row of about four, near the sulcus. Dorsal 
aspect ovate, irregularly and obsoletely angular. Length 
123, inch; height 29%, inch. 
The occurrence of this species in a recent state was first men- 
tioned by Professor T. Rupert Jones (loc. cit.), who obtained it 
from ditches of brackish water at Gravesend, and who has kindly 
supplied me with specimens from that locality for examination. 
These ditches are now, I believe, nearly silted up with mud and 
decompcsing matter. It has also been taken by the Rev. A. M. 
Norman on the sands at Weston-super-Mare, to which position 
it had probably been washed by the Uphill River. Mr. Norman 
has recently taken it in fresh water in the “ Forge Dam,’ Sedge- 
field, and in immense profusion in brackish water at Hartlepool. 
