GASTEROPODA. 
125 
Fam. Buccinidce. 
Purpura, Adanson. 
*P. rudolphi, Lam. — A sliell about an eighth or a quarter of 
an inch in length ; found abundantly in a living state adhering to 
the rocks around the sea-coast at water -mark. 
Order Pectinibranchiata. 
Fam. Fatettida. 
Patella, Linn. 
*P. ceerulea, Lam. — The Blue Limpet of St. Helena, found plen- 
tifully alive and sticking to the rocks on the sea-coast about high- 
Water mark. 
*P. plumbea, Lam. — Pound also alive with the other species. 
Tectura, Aud. & Mine. Ed. 
*T. virginea, Mull. — A minute limpet-shell, of a tortoise-shell 
appearance, picked up on the sea- shore. 
Hipponyx, Defrance. 
*H. mitrula, Lam. — Pound living, hut not common, clinging 
to the rocks at water-mark on the Windward Coast ; a shell about 
one-fourtli to one-half an inch in diameter. 
*H. radiatus, Quoy and Graimard. — A species similar to hut 
smaller than the last. 
Fam. Fissurellidce . 
Fissurella, Bruguiere. 
*F. arcuata, G-. B. Sow. — A small limpet-shaped shell, picked 
up on the sea-shore abundantly, but not alive* 
Fam. Littorinidce. 
Littorina, Fer. 
*1.. helense. — A small periwinkle, found abundantly alive and 
sticking to the rocks all around the sea-coast at and above liigh- 
"water mark. 
*L. striata, King. — Also found alive with the other species. 
