202 EULIMID.IJ. 



goldcn-yollow, on a level with the base of the tentacles ; this 

 part is seldom protruded, although the eyes arc cons])icuous 

 through the sliell : foot small and mostly sliort, scjuarish and 

 broader in front, with angular corners or lob.s 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 : <iill 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 : Uver purplish. 



SuHLL 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 stria3, which arc crossed })y 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: tuhorls 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 wliorl envelopes 

 the peripliery of the next above it thun l)y any groove : mouth 

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

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

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

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

 lanous dejjosit, which is considerably thickened beliind the 

 piUar; this last is flexuous : o^x^rnJit/u thin, pale yellowish- 

 horncolour, marked with microscopical and numerous flexuou>j 

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



Habitat : Every part of the Ikitish seas, from Unst 

 to Jcrs(iy, in muddy sand, 7-50 f. ; Mull of Galloway 

 145 f. (J5eccdiey). Fossil in post-glacial beds, Norway, 

 50-80 ft. (Sars), lied and Coralline Crag (AVood), 

 Sicily (Desliayes and Pliilippi), Miocene formation near 

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

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



