MONODONTA. TURBO. 71 



M. MODULUS. Sub-orbicular^ obliquely de- 

 pressed, transversely striated, and obsoletely plait- 

 ed longitudinally, whitish, with scattered purple 

 spots; the lower face concentrically furrowed, 

 umbilicated; both rather prominent; diam. ^, 

 W. 29. 71. 



M. LABEO. Ovate -conic, thick, ventricose, 

 imperforate, with transverse rows of beads, and 

 spotted with red and black ; wrinkles nodulous ; 

 lip double, white, furrowed within. ^ . . . l^^. 

 W. 29. 80. 



TURBO. 



Conoid, or sub-turret ed, circumference never com- 

 pressed ; aperture entire, round; margin of 

 outer lip disunited; columella arcuated, de- 

 pressed, but not truncated at its base ; a testa- 

 ceous operculum. 



T. ARGYROSTOMus. Obsolctely perforate, sub- 

 ovate, with transverse ribs, which are somewhat 

 alternately larger and longitudinally wrinkled; 

 yellowish ash - colour, with reddish - brown or 

 greenish stains; mouth silvery; diam. 2|-. W. 

 31.76. 



T. CHRYSOSTOMus. Sub-ovatc ventricose, 

 imperforate, transversely furrowed, and wrinkled 

 longitudinally; yellowish ash-colour, sub-radiated 

 with longitudinal reddish-brown flammules; cer- 

 tain of the furrows armed with vaulted and ele- 



