§60 



ZOOLOGY. 



their shells are generally strong, rough, and hollow ; and 

 their flesh may with safety be used for food. 



25, Stromhus, Screw-Shell. Inhabitant a Limax» 



Shell spiral, expanded ; aperture much dilated, and the lip 

 expanding, produced in a groove, inclining to the left, 

 Plate 5, fig. 25. There are four families in this genus, 

 * Outer Lip digitated, projecting in linear divisions 

 or claws; ** Lobed ; *** Dilated; **** Tapering 

 with a long spire. 



All the Strombi are inhabitants of the ocean, and are usu- 

 ally found upon rocky shores. 



26. Murex, Rock-Shell. Inhabitant a Limax, 



Shell spiral, roughened with protuberances ; aperture oval, 

 terminating in a narrow strait canal^ inclining back- 

 wards. Plate 5, fig. 26. There are seven divisions in 

 this genus; * Spinous^ with a produced beak: 

 having Longitudinal sutures expanded into crisped or 

 curled Foliations^ Beak short: with thick 



rounded, protuberant Sutures: **** more or less 

 spinous^ Beak wanting : without spines^ having 



a long, strait, pointed Beak: Tapering^ with a 



long spire^ and short ; ******* with a toothed 

 columella. 



Most of this genus are found on rocky shores, within the 

 influx of the tide, some few burrow in the sand, and th# 

 whole are entirely marine. Their shells are mostly ruggedj 



