GASTEROPODA. 121 



1. Fossarus sulcatus. S. Wood. Tab. VIII, fig. 23, a — d. 



Phasianema sulcata. S. Wood. Catal. of Shells from the Crag, in An. and Mag. Nat. Hist. 



1842, vol. ix, p. 935, pi. 5, fig. 15. 

 — lineolata. S. Wood. Catalogue, var. (3. 



Fossarus clatiiratus. Phil. En. Moll. Sic. vol. ii, p. 148, t. 25, fig. 5, 1844. 



Ph. Testa, ovato-fusiformi ; apice obtuso ; anfractibus tribus, convexis ; transversim 

 sulcatis ; interstitiis longitudinaliter plicatis ; suturis depressis ; labro acuto ; columella 

 paululum uniplicatd. 



Shell ovato-fusiform, with an obtuse apex ; volutions three, convex; transversely 

 sulcated, or rather ridged ; longitudinally and finely plicated between the ridges ; 

 aperture large, ovate, acuminated at the upper part ; outer lip sharp ; inner one 

 slightly replicate, with a small fold upon the columella. 



Axis, y of an inch. 



Locality. Cor. Crag, Sutton. Recent, Mediterranean. 



Var. |3, lineolata (fig. 23 c, d) was considered in my Catalogue as a distinct 

 species, the sulci or ridges being greater in number, with a more tumid form in 

 the volutions. The acquisition of more specimens has, however, removed some of 

 these distinctions, and I am compelled now to include it only as a variety. About 

 eight or ten elevated ridges cover the exterior of var. a, and these are sometimes 

 at irregular distances, the furrows or spaces between them being wider than the 

 ridges, and crossed by imbricated lines of growth ; the shell is thin, and the ridges 

 are visible from within. 



This species is in all probability the same as M. Philippi has figured at the above 

 reference, though his shell appears to be larger, with fewer elevated ridges. I 

 have no specimen with less than eight, while some have as many as fifteen ridges, 

 as in var. |3. In my specimens there is a thickening, or an obsolete tooth, about 

 the middle of the columella, close to the umbilicus. 



Lacuna, Turton, 1827. 

 Temana. Leach, MS. 1819. 

 Turbo (spec.) Mont. 

 Lute a. Broion, 1827. 

 Macrompiialus. /S. Wood, 1842. 



Gen. Char. " Shell thin, conoid, or somewhat globular, clothed with an 

 epidermis ; aperture entire, rounded or oval, with the lips disunited at the top ; 

 pillar flattened, with a longitudinal groove, which terminates at the upper end in 

 an umbilicus ; operculum horny." 



The above characters are given by Dr. Turton for this genus in the third 

 volume of the ' Zoological Journal,' p. 190, where he also describes seven species, 

 all of which appear to have a smooth exterior. Its principal distinction appears 

 to be the elongated depression behind the edge of the inner margin of the aperture. 



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