81 



CYPR7EA. 



A. Mucronate, or with a projecting spire. 



(Plate XIV. Fig. I.) 



B. Obtuse, and without manifest spire. (Fig. 2.) 



C. Umbilicate. (Fig. 3.) 



D. Margined. (Fig. 4.) 



Shell univalve, involute, subovate, obtuse, 

 smooth. Aperture effuse at both ends, linear, 

 toothed on both sides, longitudinal. 



The genus is remarkable for the high polish 

 which adorns it in its native state. The only spe- 

 cies of other genera which are likely to be con- 

 founded with it, are one or two Bullae : these, 

 however, have only one lip toothed or slightly 

 plaited. The outer lip is usually thicker, and 

 more incurved in this than in any other genus, 

 resembling more or less the inner one. 



A very remarkable and unprecedented property 

 has been ascribed to the Limax inhabiting the Cy- 

 praea ; namely, the power of quitting his tenement, 

 and elaborating a new one more suited to his ne- 



