2$6 JOURNAL OF CONCHOLOGY, VOL. 9, NO. IO, APRIL, I90O. 



O. fenestrata Forb. — Kilchattan Bay, Bute, one specimen 

 (Robertson), the furthest point north for this species ; St. Aubin's 

 Bay, Jersey; Guernsey; Plymouth Sound; Torbay and Babbacombe 

 Bay ; Weymouth. 



Although a scarce species, this is comparatively plentiful at Ply- 

 mouth and Torbay. The largest come from Jersey, and are two lines 

 in length by half-a-line in width ; some are more slender, and a few 

 are broader than the type. Jeffreys' figure is a good one, but the 

 shell is never so large and conical as depicted by Sowerby or Forbes 

 and Hanley. 



O. excavata Phil. — Scilly (Smart and others) ; Killala Bay (Miss 

 Warren)! all the Channel Islands; Connemara, Mayo, and Sligo ; 

 off Loch Ryan, 25 f. ; Skelmorlie and Dunoon; Eigg Island, 20 f. 

 Rare in a living state. My finest living specimens (a cluster of three) 

 were found under a stone at low water at Herm, but I think that was 

 exceptional. Jeffreys' figure is a very good one ; Sowerby's is not 

 like ; our shell has a different mouth, a visible tooth, a deeply- 

 channelled suture, and turreted whorls. 



O. scalaris Phil. — Scilly Islands (Smart and others) ; Sark and 

 Herm ; Porthcurnow ; Eddystone ; Bantry Bay. 



Var. rufescens F. & H.— Scilly, 40 f. (Smart and J.T.M.) ; 

 Isle of Man (L.M.B.A.) ! Millport, Cumbrae; Davaar Island 21 f. ; 

 Otterard Rock 20 f . ; Carradale 23 f. ; Aird's Bay, 10 f., and Lynn of 

 Morven, 50 f. (Knight) ! the Minch off Barra, 40 f, and Sound of Sleat, 

 40-85 f. (Somerville and J.T.M.) ; Babbacombe Bay; off N. Little 

 Cumbrae, 40 f. ; Lamlash, 15 f . ; Kyles of Bute, 18 f. ; Loch Linnhe, 

 26 f . ; Clyde, 18 f . ; Loch Broom, 20 f. ; the Minch, 70 f. Also 

 Atlantic off Scilly, 690 f. (" Porcupine") ! 



This is a scarce species except at Guernsey and Herm, and very rare 

 in a living state ; its true habitat is not known. On one occasion I 

 found a group of eight living specimens, all fully adult, under a stone 

 at low water at Herm, attached to the leathery tube of a sessile 

 annelid. This pecular habitat, like that of a group of the last species, 

 I am unable to account for, but that habitat is not the usual one, as I 

 have never been able to " repeat the dose." Two specimens from 

 Guernsey have the finer and closer longitudinal ribs of var. rufescens, 

 but are otherwise typical. The Scilly form of the variety is not the 

 true rufescens, but intermediate, and occurs with the type ; and off 

 Loch Ryan and in the Minch off Barra the same intermediate form 

 occurs with the var. rufescens. 



(To be continued.) 



