215 



quadrangular form. Seven species are named by La* 

 marck, but several others are known. 



Solarium perspcctivum Solarium stramineum 



granulatum hybridum 



laevigatum variegatum 



Solarium luteum. 

 [There are also eight fossil species.] 



ROTELLA. 



TROCHUS VESTIARIUS. Lillli. 



Sowerbys Genera, No. 14, plate 2. 



The base of the shells of this genus being particularly 

 callous, and several peculiarities being observable in the 

 sutures and appearance of the surface, which do not 

 exist in the G. Trochus, Lamarck has been induced to 

 establish the present genus. It in some respects re- 

 sembles the G. Helicina; but the shells of the latter 

 being terrestrial, with the lip reflected, and the callo- 

 sity extending beyond the umbilicus, cannot be con- 

 founded with this genus. Shell orbicular, highly 

 polished, without an epidermis; spire subcorneal, very 

 low; aperture semicircular, and probably closed by an 

 operculum. Lamarck has altered the specific name 



