CYTHERE. 109 



2. CYTHERE RENIFORMIS. Tab. XX, figs. 5, 5 a-f. 



Cv Til ERE RENIFORMIS, Baird, Trans. Bcrw. Nat. Club, i, 98, t. 3, 



f. 5, 1835 ; and ii, 153 ; Mag. Zool. and 

 Bot., ii, 142, t. 5, f. 16-22. 

 M. Edwards, Hist. Nat. Crust., iii, 408. 



Shell reniform, rough with hairs ; both extremities of 

 nearly equal size, anterior a little flatter than posterior. 

 The centre of the valves is covered with a calcareous- 

 looking crust, which is rather of a darker colour than the 

 rest of the shell, and appears studded all over with short 

 spines. The colour of the shell is of a light brownish 

 yellow ; and the legs and antennae of the animal are 

 brightly marked with the same hue. 



It approaches the C. lutea, Mull., in shape ; but differs 

 somewhat in colour, in being roughly hairy, and having 

 the valves covered with the hard crust. 



Hab. Coast of Berwickshire ; at Cockburnspath, Ber- 

 wick, &c., 1835. N. Foreland, near Dover, August and 

 September, 1849. 



3. CYTHERE ALBO-MACULATA. Tab. XX, fig. 7. 



CYTHERE ALBO-MACULATA, Baird, Mag. Zool. and Bot., ii, 142, t. 5, 



f. 23, 1838 ; Trans. Berw. Nat. Club, ii, 153. 

 M. Edwards, Hist. Nat. Crust., iii, 408. 



Shell oblong, a little flatter at the anterior extremity, 

 gently rounded on the upper margin, and deeply sinuated 

 on the lower, near the anterior extremity. Both the ex- 

 tremities and the lower margin are densely hairy. The 

 central portion of the valves is covered with a calcareous- 

 looking crust, as in the last species, and is studded all 

 over with short spines, except where it is marked with two 

 white, smooth, shining spots of considerable size. The 

 colour of the shell is altogether of a dull brown. 



Hab. Berwick Bay, 1835 ; not very common ; near 

 Dover, September 1849. 



