172 
BRITISH ENTOMOSTRACA. 
Hab . — Dredged in from eighty to ninety fathoms of 
sand ; twenty miles east of the Noss in the Shetland Isles ; 
R. M‘Andrew, Esq. 
9. Cythere inopinata. Tab. XX, figs. 1, 1 a-e. 
Cytheke inopinata, Baird , Zoologist, 1, 195, f. a, b ; Trans. Berw. 
Nat. Club, ii, 153. 
Shell oblong ovate, nearly of equal size at each ex- 
tremity ; white, with a slightly orange-coloured mark on 
the upper edge; transparent, smooth, and shining ; perfectly 
free from hairs, but possessing a few short, spinous pro- 
jections on the lower margin of the posterior extremity. 
Each valve has a gibbous projection about the middle, 
which is best seen when the animal is lying on its back, 
and is sinuated on the inferior margin. 
The superior antennae (f. 1 b) are composed of five (?) ar- 
ticulations, and furnished with several rather short setae. 
The inferior or pediform antennae (f. 1 c) are provided with 
a stout, jointed seta. This species is very small, and from 
this circumstance and its always creeping at the bottom, 
is easily overlooked. 
This is the second species only that has as yet been 
found inhabiting fresh water, Mr. Say having previously 
described one as occurring in Georgia and East Florida. 
See ‘ Journ. Acad. Nat. Sc./ Philad. 1817. 
Hab . — The only place I have ever found this species is 
in a small pond between Han well and Southall, Middlesex. 
10. Cythere angustata. Tab. XXI, fig. 6 . 
Cytherina angustata, Munster, Jahrbuch fiir Mineralogie, 1838, 
t. 6, f. 10. 
Shell oval oblong, obtuse at either extremity, narrower 
anteriorly, and slightly sinuated on inferior margin. It 
is of a pale yellow colour, and the surface is shining and 
polished-looking, but when examined by the microscope, 
it is seen to be covered with small asperities. The sub- 
stance of the shell is horny-looking and transparent. 
Along the dorsal margin, on each side, there is a series of 
