ClLjUJSILIA. 



the genus takes its name; and whose function appears to 

 be to close up the aperture when the animal has withdrawn 

 itself within the shell. Peritreme continuous, free all 

 round, reflected : in which respect it accords with some 

 of the Pupfe ; these latter are however destitute of the 

 clausium. Many of the species are longitudinally striated 

 on the external surface ; this, however, is not the case 

 with all. We have represented two or three of the species 

 that difi^er most in general appearance. 



CI, Macascarensis, a new and very rare species lately 

 discovered in Hungary. 



CL labiata. Turbo labiatus, Mont, from Malta, a 

 species that has been published as British, in our opinion 

 without sufficient reason. 



CI. torticollis. 



A section showing the Clausium is shown at Fig 1. 



