MARSHALI.: ADDITIONS TO ‘‘ BRITISH CONCHOLOGY.” 347 
low water, and dead in 1o—20f. off Guernsey ; Land’s End. 
Also Adventure Bank, 92—120 f.; the Tripoli coast ; and 
Corea, 30—50 f. 
L. clarkige Clark.—Sea-weeds in rock-pools at very low spring 
tides. Scilly, 40 f. (Burkill and J.T.M.); Puffin Island 
(L.M.B.C.)!; Iona, 20 f.;.Rum Island, 33 f.; Gairloch, 
12—30f.; and Vatersay Sound, Barra, 5 f. (Somerville and 
J.T.M.) ; Jersey, Guernsey, and Herm, living in weeds at 
extreme low water and dredged dead in 20 f.; Sennen Cove, 
St. Ives, and Falmouth in Cornwall; Borough Island; 
Torbay, in rock-pools, at very low water ; Margate ; Tenby, 
Manorbeer, Caldy Island, Laugharne, Freshwater East, Bar- 
mouth, Milford, and Towyn, in Wales; off the Smalls ; 
Skegness; Bantry Bay ; Connemara; Mayo; Sligo; Bun- 
doran ; Aberdeen. I have also a valve from the Atlantic 
off Scilly, 690 f., dredged by the ‘Porcupine.’ 
All the above dredging localities produced dead speci- 
mens only or valves. Jeffreys quotes 18 to 80 fathoms as 
its habitat ; but I consider that to be erroneous. It is more 
diffused and plentiful than is generally supposed, but 
difficult to procure alive, as it lives at the extreme verge of 
low spring tides, and so cannot be procured by the dredge ; 
but its valves are thrown ashore nearly all round our coasts. 
The animal is undescribed. I have frequently taken it 
alive in the Channel Islands and South Devon, but the 
process of steeping the weeds in fresh water is fatal to the 
animal. One of Turton’s habitats for Wonfacuta substriata, 
“attached to corallines, on the Devonshire coast,” I con- 
sider applies to this species, as the former is never found 
away from Echinoderms. It is extremely variable in outline 
and in the position of the beaks. Some specimens are oval, 
like a young Zafes virgineus ; others are triangular, like a 
young JVucuda nitida ; another form is abnormally oblique, 
with the beaks much nearer the posterior side; while more 
