332 



ADDITIONS TO "BRITISH CONCHOLOGY." 



By J. T. MARSHALL. 



(Continued from page 296). 



O. rufa Phil. — Brodick Bay, 40 f., and Sound of Sleat, 50 f. 

 (Somerville and J.T.M.); Loch Linnhe, 24 f. (Knight)! Milford 

 Haven, 10 f. ; Cumbrae; Kyles of Bute, 18 f. ; Oban; Loch Fyne ; 

 Loch Broom, 20 f. ; the Minch, 40 f. ; E. Shetlands, 35 f. 



Var. fulvocincta F. & H. — 18 to 90 f. Sound of Sleat, 30-90 f. 

 (Somerville and J.T.M.); Tenby; Portmarnock; Doggerbank ; 

 Cumbrae, 18 f.; Oban, 16-25 f - '> Loch Broom, 20 f. ; the Minch, 40 f. 

 At all the Scotch localities the type and variety were dredged 

 together. 



Although generally speaking the type is southern and the variety 

 northern, they are by no means exclusively so, the two forms being 

 found together in many parts of the north, and at various depths, as 

 the preceding records show. The variety merges from the type 

 through every degree of slenderness. It never attains the size of the 

 latter, and the degree of convexity in the whorls is so variable that 

 the only character by which it can be separated from it, when dead, is 

 its comparative slenderness; when fresh, the ground-work of the shell 

 is paler and the band darker; even so, some specimens may be 

 ascribed to either. A whitish form, with or without bands, is some- 

 times met with, and dead specimens become white ; one of these 

 latter, " found on the sands near Dunbar," is O. crmatus Brown. 



Jeffreys long ago pointed out 1 that " Totten's specific name 

 (interrupta) is prior to that of Philippi, and ought to be adopted," but 

 he himself, and subsequent writers, prefer for some reason to retain 

 Philippi's well-known name. 



O. (Turbonilla) multilirata Monterosato. — "Similar to O.pusilla, 

 but adorned with granular spiral stria. Palermo, 60-90 metres" 

 (Monterosato). This is new to the British seas. It may be known 

 from the next species (O. verticalis) which it most nearly resembles, 

 by the microscopical spiral stria? which traverse the whole shell, ribs 

 and interstices alike, though these striae are more readily observable 

 between the ribs, where they may be seen with an ordinary lens. 

 The embryonic apex is larger and more exposed than in any of the 

 allied species, and lies in a horizontal position on the top of the spire. 

 I have one specimen only from the Atlantic side of the Scilly Islands, 

 in 40 fathoms, which was on the same ground as yielded other rare 

 Mediterranean species {Tellina serrata and Rissoa subsolutd) which I 

 have already recorded. My Scillonian specimen is nearly a quarter- 



1 Moll. " Lightning" and " Porcupine," Proc. Zool. Soc, 1884, p. 356. 



