CYTHERE. 
171 
6. Cythere atjrantia. Tab. XXT, fig. 8. 
Cythere aurantia, Baird , Mag. Zool. and Bot., ii, 143, t. 5, f. 26, 
1835 ; Trans. Berw. Nat, Club, ii, 153. 
— M. Edwards, Hist. Nat. Crust., iii, 408. 
Shell somewhat reniform, rounded and rather promi- 
nent on upper margin ; slightly sinuated underneath, the 
posterior extremity rather broader than the anterior. The 
valves are smooth, glaucous, and of a bright orange colour. 
This species is very minute. 
Hah . — Berwick Bay; 1885. /£okzr zfk/ 
7. Cythere nigrescens. Tab. XXI, figs. 4, 4 < 2 . 
Cythere nigrescens, Baird, Mag. Zool. and Bot., ii. 143, t. 5, f. 2 7, 
1838 ; Trans. Berw. Nat. Club, ii, 153. 
— M. Edwards, Hist. Nat. Crust., iii, 409. 
Shell gibbosely ovate, anterior extremity rounded, nar- 
rower than posterior, which is marked by a gibbous pro- 
jection above and below, and is terminated by a sharp 
point. The valves are quite smooth and free from hairs, 
of a dirty, black colour, and translucent, showing the 
body of the animal, which is of a very dark hue, shining 
through. 
Hcib . — Berwick Bay; not uncommon ; 1835. Dover, 
September 1849. Arran, Boston, &c., in sand ; W. C. 
Williamson, Esq. 0. ^ < <■ 
8. Cythere minna. Tab. XX, figs. 4, 4 a-d. 
Baird 1 a siliqua (var., c. F), T. JR. Jones, Entomost. of the Cretaceous 
Eormation of England. 
Shell elongate ovate, bluntly conical on the dorsal mar- 
gin, nearly plain beneath ; obtusely rounded on anterior 
extremity ; sharply acute posteriorly, and narrow, the ex- 
tremity of the shell being produced into an acute point. 
The valves are smooth, glabrous, white, and pellucid. 
This is totally different from any yet described, and is a 
very distinct species ; it is the largest of all I have seen. 
