70 



XL CLAUSILIA. 



Shell reversed, with an elongated slender fusiform 

 spire, the second volution more tumid than the 

 first, obtuse or papillary at the summit : aperture 

 oval, oblique, united all round and margined, 

 toothed, and furnished with an internal spiral 

 operculum. 



The elegant spindle-shaped outline of this family 

 having the lowest volution slenderer than the next, 

 and being consequently more tumid above the 

 aperture, fixes its distinction from the Bulimus. 

 All our native species are reversed. 



b^. Clausilia laminata. Shell nearly smooth, glossy, 

 and transparent : aperture with two white plaits : 

 operculum emarginate. 



a. dark chocolate-brown. 



b. greenish-white and quite transparent. 



c. with the internal laminae notched. 



Clausilia lamellata. Leach, Mollusc, p. 118. 

 Clausilia bidens. Drap. p. 60. t. 4!.f. 5 — -7. 



Brard,p. 83. t. 3./. 9. 



Turbo laminatus. Mont. ^j. 359. ^ 11./. 4. 



