MARSHALL : ADDITIONS TO " BRITISH CONCHOLOGY. 299 



represented in all the varieties, though rare except at Scilly, where it is 

 mostly represented in the next variety. 



Var. minor Marsh., n.var.— Much smaller and proportionally more 

 slender. Occurs in the Scilly Islands, the Land's End, and the 

 West of Ireland, from the coralline zone. It has the dimensions and 

 outlines of Donovania miiiiina, and must not be mistaken for a 

 dwarf of the type, which is more generally diffused. 



C. linearis and vars. intermedia and pallida were all three figured 

 and sufficiently described by Forbes and Hanley,' and the two latter 

 varieties should not have been arbitrarily put aside and merged into 

 a var. cequalis by Gwyn Jeffreys, who gave no explanation for this 

 course. Forbes and Hanley indicated the three forms as " the 

 purple-tipped (scabra), the blunt-ribbed {intermedia), and the colour- 

 less {pallida),''' but they were not so happy as usual in depicting these 

 three forms ; the figures are certainly good, but the differences are 

 not sufficiently defined ; their fig. i should be more scabrous, and 

 their fig. 3 more oblong. Nor do any other of the published figures 

 improve on these, except Sars' fig. 2 (t. 23), which well represents the 

 var. intermedia. The three forms are connected together by every 

 degree of sculpture, both of spirals and longitudinals. The differences 

 between the type form and var. pallida are very great, as much as in 

 any two species; but the var. intermedia is less easily differentiated, as 

 the sculpture sometimes partakes of two forms, and can be assigned to 

 one or the other. Forbes and Hanley's description of a purple apex 

 for the type and a yellow one for the var. ititermedia is not tenable; 

 although the latter is .always yellowish, so are the former occasionally. 

 The largest come from Aberdeenshire and the Orkneys. A very 

 pretty form with nodulous sculpture comes from Scilly, lona, the 

 Minch, and the Shetlands, and its analogue in the \a.x. pallida, from 

 the Scilly Islands, is beautifully granulated ; while a pure white 

 delicate form of the latter comes from West Orkneys 45f Specimens 

 are sometimes met with in which the sculpture is evenly reticulated, 

 and these may be mistaken for C. reticulata ; others resemble C. 

 leufroyi in the thick and rounded ribs, but the intersections of the 

 sculpture are not granular as in the latter species, while the earlier 

 whorls differ from those of C. leufroyi in being more slender, with a 

 sharper tip, and the first two regular whorls reticulated. There is some 

 misconception as to the dimensions of C. linearis. Forbes and 

 Hanley say that the largest are 5^ lines by 2\, a size I have never 

 seen approached. Sowerby gives two figures, one (fig. 13) to 

 represent the type, and the other (fig. 12) to represent ysiv. pallida, 

 but he makes the latter twice the size of the type ; and Gwyn Jeffreys 



I Brit. Moll., vol. iii., pp. 471-2, pi. cxiv. figs. 1-3. 



