176 
BRITISH ENTOMOSTRACA. 
3. Cythereis antiquata. Tab. XX, fig. 2. 
Shell oblong, very thick, rough with granulations, and 
having two or three thick crests or ribs running along the 
centre of the valves. One extremity is flattened, and has 
four short, stout teeth springing from its edge ; the other 
is more convex and rounded. The whole circumference 
is wrinkled, and the shell presents a very antiquated 
appearance. 
Hab . — Isle of Skye, in sand ; W. C. Williamson, JEsq. 
Family 2— CYPRIDINAM1. 
Character . — Eyes two, pedunculated. Antennae, two 
pairs, both pediform. Eeet two pairs ; one pair always 
inclosed within the shell, and of a very peculiar structure. 
Abdomen terminated by a broad lamellar plate, armed 
with strong claws and hooked spines. 
Genus Cypridina. 
Cypeidina, M. Edwards, Lamarck, Hist: Nat. An. s. Vert., 2d edit., 
v, 178, note, 1838 ; Hist. Nat. Crust., iii, 109. 
— Baird, Ann. and Mag. Nat. Hist., 2d series, i, 21. 
— Dana, Conspect. Crust., 50. 
Cypeella ( not Cypeidina), Bosquet, Entomost. de la Craie de 
Maestricht. 
Asteeope, Philippi, Ann. Mag. Nat. Hist, (fide Dana in literis.) 
As there is but one genus, the character given above 
for the family will suffice for it also. 
The genus Cypridina was founded by M. Edwards in 
1838, in a note to the genus Cypris, in the fifth volume 
of Lamarck’s ‘Hist. Nat. An. s. Yerteb.,’ and was after- 
wards more fully detailed in the third volume of his ‘ Hist. 
Nat. Crust/ The animal resembles a good deal in its 
general form and structure that of the Cypris, while the 
shell at first sight might easily be mistaken for one of that 
genus. It has, however, two eyes, distinct from each 
other ; two pairs of antennae, both pediform ; one pair of 
natatory feet ; and a peculiar organ, apparently for sup- 
porting the ova, similar in purpose to, but differing in 
