328 JOURNAI, OF CONCHOI.OGY, VOL. 13, NO. II, JUf.Y, I9II. 



Brown having dredged thirty Hving specimens in one haul; Brodick 

 Bay 4of., Sound of Sleat 30-90^, and Gairloch 3of. (Somerville and 

 J.T.M.); Lamlash 10-25^; Loch Fyne 35f.; Locii Linnhe 2^f.; Loch 

 Hourn 2of.; Loch Liver 25^; Loch Leven 24f.: Minch off Barra 5of.; 

 West Orkneys 45f. 



Jeffreys' figure exhibits a conspicuous fold on the pillar, which is 

 incorrect; the shell at that part is merely thickened and slightly 

 reflected, as in Sowerby's. 



C. nitidula Lov. — St. Mary's Sound, Scilly, 351'., rather plentiful 

 in one particular dredging, and not hitherto recorded from the south ; 

 Southport iif., a single specimen. The finest come from Stornoway, 

 and are a line and a half in length ; this is the var. major of 

 Continental writers. 



The young of this and the next species are more easily separable 

 than the adults ; that of C. umbilicata is more globular, with a de- 

 pressed crown. I have already in a previous paper drawn attention 

 to the transposition of Jeffreys' figures of the two species. Sowerby's 

 figure of C. nitidula should not have a cup-shaped depression at the 

 apex, and that of C. umbilicata (fig. 11) should be less oval, and 

 exhibit spiral strise. 



C. umbilicata Mont. — Sutherlandshire (Bailie and J.T.M.); 

 Scilly 4of , not uncommon (Smart and others) ; Guernsey 2of., rare ; 

 Aberdovey, a dwarf form ; Doggerbank 2o-4of. ; Connemara, Mayo, 

 and Sligo ; Tan Spit, Cumbrae, i5-2of.; offIona2of.; Stornoway lof, 

 very fine. 



var. strigella Lov. {Journ. of Conch., 1893, vol. vii.,p.263). — Loch 

 Fyne and various parts of the Scotch coasts (Forbes and Hanley) ; 

 Stornoway lof , East Shetlands 4of. In this variety, which is larger 

 and coarser, the spiral sculpture is easily observable, and when the 

 lines of growth are also coarser, which sometimes happens, the surface 

 is decussated. Li the latter state it is the Cylichna crebrisculpta of 

 Monterosato. Gwyn Jeffreys was mistaken in assuming that this 

 variety was described by Loven from typical specimens in a fresh 

 condition. 



C. umbilicata is very sparingly distributed throughout the Hebrides. 

 From about twenty localities thence, only a few specimens have 

 occurred to me in each dredging, but more numerous colonies are 

 living at lona, Cumbrae, and Stornoway, though not with C nitidula ; 

 the only places where I have found the two species living together have 

 been at Aberdovey and Stornoway, where they are about equally 

 mixed. Li the Kyles of Bute this species live in 8-i4f., whence C. 

 nitidula takes its place down to 24f, The shell is difficult to dis- 



