MARSHALL: ADDITIONS TO "BRITISH CONCHOLOGY. ' 297 



they do the greatest diversity, and it would have been helpful and 

 interesting to future systematists if some of these forms could have 

 been made available. Embryonic and imperfect examples obviously 

 should not be described as new species, but where they exhibit 

 marked characteristics they should not be ignored. 



Clathurella anceps Eichw. — Scilly Islands (Smart and others); 

 Aberdeenshire (Simpson and J.T.M.); Eddystone, Loch Fyne, and 

 the Minch off Barra. 



Var. soluta Marsh, n. var. — Shell more slender throughout, spire 

 proportionally longer, whorls spindled, suture deeper and more 

 oblique. Aberdeenshire, Scilly Islands 4of., Loch Fyne 3of., West 

 Orkneys 45f. 



There are two sizes of this shell, as in all other British species of 

 Clathurella, one of which does not exceed three lines in length, while 

 the other, the typical one, is 6-ioths of an inch by ;|in. The finest 

 come from Loch Fyne and Aberdeenshire. An immature specimen, 

 which had received some damage, has been repaired and finished to 

 maturity, but the added portion has been coloured pink. Sowerby's 

 figure, as well as Forbes and Hanley's (two), are excellent ; in Jeffreys' 

 the proportions are wrong, the spire being too short and the last 

 whorl too large and inflated \ the sculpture moreover is too coarse. 

 C. anceps, having been published by Eichwald in 1830, takes pre- 

 cedence of C. teres published by Forbes in 1844. Gwyn Jeffreys 

 maintains their distinctness, but C. anceps is such a very characteristic 

 shell that there should be no room for doubt either as to the de- 

 scription or the figures of its author. 



C. gracilis Mont.— Scilly Islands (Smart and others). A 

 monstrosity from Guernsey is without a canal. 



C. leufroyi Mich. — Aldemey (Marquand) ! Scilly Islands 

 (Burkill and J.T.M.); Port Erin, Isle of Man (Heathcote) ! Jersey 

 and Herm, Freshwater West, Mayo and Sligo, Lamlash i5f., Dornoch 

 Firth, Pentland Firth 3of., the Minch off Barra 4of. 



Var. carnosula Jeff.— Scilly Islands 4of. (dwarf), W. Orkneys 

 45 f. Almost as variable in size as the type. 



This species varies extremely in size, in proportions of the spire 

 and body-whorl, and in length and breadth. There are two principal 

 sizes, according to habitat ; one is a third to half an inch in length, 

 thick and solid, and this lives at low-water mark under stones in the 

 south of England, west of Ireland, &c.; the other is nearly an inch 

 long and proportionally broad, thinner in texture, and always dredged ; 

 the latter is the Hebridean, Mediterranean, and Crag form, though I 

 have both these forms from the Mediterranean, notwithstanding 



