48 Rev. A.M. Norman on new British Species of Ostracoda. 
lata, vittam elevatam fingens, processuque triangulari externe con- 
spicuo ad partem cardinis anteriorem instructa. Long. vix 3; une. 
Habitat fretum, qui Firth of Clyde vocatur, in Scotia occidentali. 
Carapace subquadrangular, higher in front; anterior margin 
obliquely truncate, with rounded corners; the inferior margin 
produced the furthest; posterior margin rounded ; dorsal and 
ventral margins nearly straight. Surface rough and sculptured 
with large oval cells. Form, as seen from above, somewhat 
lozenge-shaped ; the sides nearly parallel throughout the greater 
part of their length, and at the extremities uniting to each other 
at a considerable angle. The breadth is less than the height, 
though the carapace is very tumid. The margins of the valves 
are at their junction raised and flattened into the form of an 
encircling rib; and the anterior extremity of the hinge is fur- 
nished with a triangular process which gives a marked character 
to the external surface of the valves in that part. The length is 
not quite %, inch. 
I found this species in 1854, in Lamlash Bay, in the Firth of 
Clyde. 
Cythere badia, n. sp. Pl. IIL. figs. 18-15. 
Forma elongata, arcuata ; margo dorsalis convexus, ventralis concavus, 
anticus et posticus rotundatus. d/titudo per totam longitudinem 
fere eequalis. Forma desuper spectata subcompressa. Latitudo 
maxima in medio sita, altitudine multo minor. Valvarum super- 
ficies rugosa, irregulariter sculpta, hic depressa, illic elevata. 
Color badius. Long. 4; unc. 
Habitat zonam littoralem ad Penzance in regione Cornubiensi. 
Carapace reniform, elongated; dorsal margin much arched ; 
ventral incurved; anterior and posterior margins rounded ; 
height nearly equal throughout the length. Outline, seen from 
above, subcompressed, broadest in the middle, but the greatest 
breadth falls very short of the height. Surface of the valves 
rough and irregularly sculptured with ridges and furrows. Co- 
lour chestnut-brown. Length %, inch. 
This is a very small species. Seen under a single lens, it 
more nearly resembles C. reniformis than any other previously 
described species; but the form is more arched, narrower in 
proportion to its length, and of more equal height throughout. 
When looked at with a higher power, the sculpture of the valves, 
moreover, is found to be entirely different. 
I met with this species in rock-pools between tide-marks at 
Penzance, in May 1855. 
Cythere contorta, n. sp. PI. II. fig. 15. 
Forma elongata, fabeeformis; margines dorsalis, anticus et posticus 
arcuati; margoventralis ante medium valde incurvatus, post medium 
