202 EULIMIDJ5. 



golden-yellow, on a level with the base of the tentacles ; this 

 part is seldom protruded, although the eyes are conspicuous 

 through the shell : foot small and mostly short, squarish and 

 broader in front, with angular corners or lobes edged with 

 yellow, narrower towards the middle, and sharply rounded 

 behind ; the inner fold or groove formed by the front edges is 

 closely lined with vibratory cilia in constant and rapid motion ; 

 sole flake-white, slightly furrowed down the middle : gill or 

 branchial plume small, narrow and finely pectinated, having 

 12-15 short strands with a central vein ; it issues on the left 

 side and ascends obliquely to the right : liver purplish. 



SHELL club-shaped, solid, opaque, and extremely glossy: 

 sculpture, none if examined with a hand lens ; but the micro- 

 scope shows the entire surface to be covered with countless 

 and close-set longitudinal striae, which are crossed by less 

 numerous and distinct but equally fine spiral lines, so as to 

 produce a partial decussation ; the periphery is more or less 

 keeled or angulated, especially in immature specimens : colour 

 ivory-white : spire long, somewhat cylindrical, and sharp- 

 pointed ; the upper part is occasionally curved : luhorls 15-18, 

 nearly fiat, compact and gradually enlarging, except the last, 

 which occupies about one-third of the spire ; the first is semi- 

 globular, and it appears to be -inverted and to have a bright 

 spot or nucleus in the centre : suture slightly oblique, defined 

 more by the darker colour of the line where one whorl envelopes 

 the periphery of the next above it than by any groove : mouth 

 acute-angled above, widening and expanded below ; its length 

 equals about one-fourth of the shell : outer lip flexuous, with 

 a rather thick edge, not inflected on the periphery, but sloping 

 from it downwards : inner lip consisting of a broadish porcel- 

 lanous deposit, which is considerably thickened behind the 

 pillar ; this last is flexuous : operculum thin, pale yellowish- 

 horncolour, marked with microscopical and numerous flexuou.s 



striae in the line of growth. L. 0-75. B. 0-2. 



i 



HABITAT : Every part of the British seas, from Unst 

 to Jersey, in muddy sand, 7-50 f. ; Mull of Galloway 

 145 f. (Beechey). Fossil in post-glacial beds, Norway, 

 50-80 ft. (Sars), Red and Coralline Crag (Wood), 

 Sicily (Deshayes and Philippi), Miocene formation near 

 Vienna (Homes). It ranges from Finmark (Sars) to 

 the JSgean (Forbes), at depths varying from 2-80 f. 



