MARSHALL: ADDITIONS TO "BRITISH CONCHOLOGY." 335 



and from Roundstone and Killala Bays, in the west of Ireland. There 

 are two sizes, a dwarf form being less than half that of the type. It 

 is well figured in Sowerby's " Index " under the name of Chemnitzia 

 stmillimus, Mont., but Montagu's species of that name was stated by 

 the author to be less slender than O. lactea, with less numerous ribs, 

 and was most probably a worn O. rufa, as suggested by Jeffreys. 

 However, that figure (fig. 2, pi. xvi.) was no doubt meant originally 

 for the supposed O. lactea var. paullula (=0. pusilla var. minuscula) 

 but was unquestionably drawn from an O. delicata, being more slender, 

 with more numerous whorls and finer sculpture. It is "characterised 

 by the ribs being exquisitely dentellated at the suture, as in some 

 Scalarice " (Monterosato). 



O. SCillae Scac— Isle of Man (L.M.B.A.)! Liverpool Bay (Tomlin); 

 Lynn of Morven, 40 f. (Knight) ! East Sutherlandshire, from stomachs 

 of haddocks (Baillie) ! Gairloch, 30 f.; Sound of Sleat, 40-90 f.; Loch 

 Inver, 25 f. ; and Loch Broom, 30-50 f. (Somerville and J.T.M.); 

 Carradale, 23 f.; Campbelltown Loch, 23 f. ; Machrie Bay, 25 f.; 

 Otterard Rock, 20 f. ; and Mull of Cantire, 24 f. and 55 f. (Knight)! 

 Scilly, 40 f.; Brodick Bay, 40 f.; Kyles of Bute, 14 f. ; Clyde, 18 f.; 

 Cumbrae, 16 f.; Arran, 12 f.; the Minch, 40 f. Also the Atlantic off 

 Scilly, 690 f. (" Porcupine ") ! 



This varies in the degree of compression and in the angularity of 

 the base, but it is a most distinctive shell, and can cause no difficulty 

 in identification. The first two regular whorls are convex and less 

 compact than the rest, as in some species of Eulima. According to 

 Monterosato, Eulimella pyramidata Desh. (1832) has priority of E. 

 scillce Scac. (1836). 



O. compactilis Jeffr. (/ Conch., vol. 7, p. 255, 1893).— Off 

 Menavawr, Scilly, 40 f. It was also dredged by the "Porcupine" in 

 1869 in the Atlantic off Scilly, 690 f., and in 1870 from three stations 

 in the Atlantic off Ireland, but only one specimen from each station. 

 This seems to be everywhere rare. Sowerby gives a figure of it in his 

 Supplementary Plates, but it is indistinguishable. His figure of O. 

 acicula (fig. 27, pi. xvi.) would suit it in dimensions and profile, but the 

 apex should be blunt. 



O. acicula Phil. — Sparingly distributed on all the British coasts, 

 from 10 f. (Torbay) to 90 f. (Sound of Sleat). 



Var. turris Forb.— Scilly 40 f. (Burkill and J.T.M.); Eddystone, 

 30 f.; Guernsey, 20 f. This is smaller than the type, and although a 

 very narrow shell, the whorls progressively increase to the base, the 

 last always being the largest. It is figured (fig. 30, pi. xiv.) in 

 Sowerby's " Index," erroneously as var. obeliscus, but was unquestion- 

 ably meant for this, and should have nine whorls instead of six. 



