66 POPULAR BRITISH CONCHOLOGY. 



V* fasciata has the shell rather thick, small, flat, and round, 

 with broad, flattened ribs; sometimes nearly white, with 

 interrupted rays of dark brown; sometimes pinkish, with 

 rich chestnut rays, irregularly edged by red lines. 



V. ovata: shell small, oval, with numerous radiating ribs, 

 crossed by very minute concentric striae. This species 

 as well as the last has a preference for gravelly sand. 



IV. Artemis. — Eound, flat, with mantle open ; tubes long, 

 united, with the edges of their openings fringed ; foot 

 " semilunar ;" valves of the shell flat, round, with a very 

 deep angular sinus in the impression of the mantle 

 pointing upwards. This last character forms the prin- 

 cipal distinction of this genus. 



A. exoleta : shell squarish-round, coarsely ribbed, coloured 

 with purplish-pink, and marked with rays of brown 

 and zigzag lines. 



A. lincta : more round, colourless, with the concentric ribs 

 more delicately fine than in A. exoleta. 



Y. Ltjcinopsis imdata has a light brown, thin, inflated, 

 round shell, with characters which seem to place it 

 very near, if not in, the genus Artemis, The siphonal 

 tubes however are divided, which is not the case with 

 Arte?nis. It is rather rare, inhabiting sandy ground. 



