MARSHALL: ADDITIONS TO "BRITISH CONCHOLOGY." 225 



O. clavula Lov. — 6 to 90 f., muddy sand. Scilly Islands (Smart 

 and others); S.W. Ireland, 5 — 79 f. (R.I. A. cruise) ; Antrim (Chaster); 

 Gairloch, 30 f. ; Loch Inver, 25 f. ; and Sound of Sleat, 40 — 90 f. 

 (Somerville and J.T.M.); Guernsey, 18 f. ; Falmouth, 19 f. ; Conne- 

 mara, i2f. ; Brodick Bay, Arran, 40 f . ; Loch Fyne, 27 f.; Loch 

 Linnhe, 10 f.; Clyde, 18 f. ; Eigg Island, 20 f. ; Loch Broom, 15 f. ; 

 the Minch off Loch Boisdale, 15 f . ; E. Shetlands, 40 f. 



Var. pistilliformis Brugnone. — New to Britain. From Round- 

 stone Bay, Connemara, 12 f., and Scilly Islands, 40 f. Rare in British 

 seas, but less so in some parts of the Mediterranean. This is 

 smaller, thinner, narrower, and more truly cylindrical, with the last 

 whorl proportionally shorter and not projecting beyond the penulti- 

 mate. It was first described by Brugnone as O. pistillus from a Monte 

 Pellegrino fossil, but that name being preoccupied for a Japanese 

 species by A. Adams, it was afterwards changed to O. pistilliformis. 

 It is also O. brugnoni of Monterosato. 



The British form of this species differs from the Mediterranean one 

 in being larger, broader, more solid, less cylindrical, and less glossy, 

 while Guernsey specimens have the whorls more compressed, a 

 shallower suture, and an angulated base. A specimen from Loch 

 Inver has the embryonic whorls exposed in a horizontal position on 

 the summit. Jeffreys has remarked 1 that " this species is always 

 distinguishable by having the shape of a short cylinder with a truncated 

 apex," but his figure is too convex, the suture too deep, and the 

 dimensions too large; it is a better representation of O. lukisi. 

 Sowerby's is better in outline, but the mouth should be oval and 

 contracted instead of expanded, and there should be a small um- 

 bilicus. Forbes and Hanley's is a good figure; but it is remarkable 

 that in this, as in other species, there is no likeness between the three 

 figures, and if compared together they appear as three species. 



O. lukisi Jeffr. — Sea-weeds at low water to 95 f. Scilly Islands 

 (Burkill and J.T.M.); Isle of Man (Leicester)! Lismore, 6 f. and 

 Lynn of Morven, 50 f. (Knight)! Oban, 18 — 25 f. ; Iona, 16 — 35^ ; 

 Loch Boisdale and Barra, 20 f. ; Loch Inver, 25 f. ; and Sound of 

 Sleat, 40 — 95 f. (Somerville and J.T.M.); Jersey, Guernsey, and Herm; 

 Penzance, low water; Borough Island and Torbay; Margate; Caldy 

 Island; Roundstone Bay and Deer Isle, Connemara; Achill Island ; 

 Killala Bay; Lamlash Bay, 20 f. ; Clyde, i8f.; Knapdale Lochs, 11 f. 



This species when alive or fresh is frequently marked with coarse 

 longitudinal flecks of a chalky white. The apex is obliquely depressed 

 and intorted, as in various other members of the genus, and often 

 eroded. It ranges in outline from a cylinder to a short cone; its 



1 Moll. "Lightning" and "Porcupine," Proc. Zool. Soc. 1884, p. 345. 



