Pe Cee Le et eee 
at alee: 
Aa Te ere 
Rey. A. M. Norman on new British Species of Ostracoda. 45 
covered all over with very numerous cells, and clothed with a 
hispid covering of intermixed hairs and arched spines. The 
spines are most evident near the dorsal margin, but there are 
none fringing the anterior and posterior margins (the only posi- 
tion which spines occupy in the last-described species). The 
dorsal margin is greatly arched, rising to a rounded summit, 
which is situated nearly in the centre of the valves: ventral 
margin slightly incurved centrally. 
The form of the carapace, viewed from above, is elongated 
ovate, slightly narrower in front than behind, and in no part 
more than slightly convex; so that the height greatly exceeds 
the diameter. The inferior antenne have four long and two 
short slightly plumose filaments. The base is convex. 
Colour dark blue-green. Length ;%, inch. 
Cypris aculeata, now first added to the British fauna, has been 
well described and figured by Lilljeborg. I received the species, 
in the early part of the summer, from Mr. G. 8. Brady, the friend 
to whom I am moreover indebted for his most kind assistance in 
illustrating this paper. Mr. Brady found it in a pond connected 
with the pumping-engine of the Monkwearmouth Colliery, near 
Sunderland. The water in this pond is of very variable tem- 
perature, but generally sufficiently hot to steam copiously. At 
the time the species was taken, the water was found by trial to 
be “over 100° Fahr.” This high temperature seemed favourable 
to the development of Entomostraca; and the luxury of a warm 
bath was shared by C. aculeata with C. strigata(?) and vidua, 
Candona reptans, Cyclops quadricornis and Daphnia vetula. 
Mr. Brady has since taken the species in Hylton Dene, which is 
also in this county, and remarks that the “specimens from this 
locality showed the same lively habits, and in the same manner 
kept generally near the surface, as those from the hot-water 
reservoir. It seems,” he adds, “quite a gregarious species, and 
swarms upon any little vegetable tuft it may find in a bottle, 
seeming to avoid the soil as much as possible. It is by far the 
most active species of the genus that I have seen.” It has been 
found during the autumn in a third locality, by myself, namely, 
in Cowpen Marshes, near Stockton-on-Tees. 
Cypris monstrifica, n.sp. PI. III. figs. 4 & 5. 
Forma oblonga; margo dorsalis subrectus, ventralis aliquantum in- 
curvatus ; margines antici et postici rotundati; altitudo vix major 
ante medium. Forma desuper spectata maxime irregularis, in 
medio constricta, hinc utrinque umbones porrecti maximam effi- 
ciunt latitudinem ; extremitates compressiores. Valvarum super- 
ficies duobus processibus umbonalibus conspicuis instructa, ex- 
