480 conidtE. 



species. Mr. Clark remarks that the eyes appear larger, 

 and the tentacula proportionately shorter in var. nebula 

 than in var. Ginnaniana, and that the ground colour is of 

 a very pale yellow brown in the latter form. 



The various forms of this species are distributed spar- 

 ingly around the British islands. Specimens are seldom 

 abundant, yet the localities are so generally diffused that 

 there needs no detailed enumeration. The variety Ginna- 

 niana is most abundant at Tenby ; lavigata, a much rarer 

 shell, is taken on several parts of the south coast of Eng- 

 land ; the very rare form 'pyramidata occurs, chiefly dead, 

 at Herm, near Guernsey (S. H.). It lives usually on 

 muddy gravel, at various depths between five and fifty 

 fathoms. It ranges from the North sea to and through 

 the Mediterranean. It occurs, fossil, in the red crag. 



M. BRACHYSTOMA, Philippi. 



Very small, pale, brownish, with strong longitudinal ridges, 

 and fine raised spiral threads ; mouth scarcely filling more than 

 a third of the length ; throat smooth. 



Plate CXIV. figs. 5, 6, and (Animal) Plate R. R. fig. 2. 



Pleurotoma hrachystoma, Philippi, Moll. Sicil. vol. ii. p. 169, pi. 26, f. 10 (from 

 types). — Thompson, Ann. Nat. Hist. vol. xviii. 

 p. 384 (no description). — Jeffreys, Ann. Nat. Hist, 

 vol. xix. p. 311 (no description). 



Matiffilia tiarula, Loven, Index Moll. Scandin. p. 14 (from tj-pe). 



Clavatula hracliystoma (fossil), Searles Wood, Crag Mollusca, p. GO, pi. 7, 

 f. 8. 



This little shell has a turreted subfusiform shape, is not 

 very strong, nearly opaque, not much shining, and is 

 either of an uniform pale Avarmish brown tint, or is 

 adorned upon a ground of that colour with a darker zone 

 near the base of the body-whorl. The surface is coarsely 



