288 TROCHUS. TOP. Class VI. 



GENUS XXVI. TROCHUS. TOP. 



Animal, a Slug. 

 Shell conic, spiral. 

 Aperture sub-triangular. 



* Umbilicated, erect, columella perforated. 



1. MAGUS. Li7i. Syst. 1228. No. 585. Lin. Tr. viii. 151. 



tuherculated. Cm. Lin. 3567. Mont. Test. Br. 283. 



Tr. with a perforated base ; somewhat de- 

 pressed ; striated ; with the ridges of the spires 

 rising into blunt distinct tubercles. Color 

 white, zig-zagged with red. 



When the upper coat is taken off, the next is 

 of a rich mother-of-pearl color. 



Ajiglesei/. Tab. Ixxxiii. Jig. 4. 



2. CINEREUS. L/n. Tr. viii. 152. Mont. Test. Br. 28Q. id. ■ 



Sup. 119. 



* Tr. a tapering umbilicated shell, with distinct 

 plane volutions. 



