THE NATURAL HISTORY SURVEY. 



179 



Jaw: Arched, ends bluntly rounded; dorsal margin 

 rounded, ventral margin with a sharp median projection; ante- 

 rior surface striated (Fig. 35, J). 



Radula formula: V+i+l+i+l+l+V (14-1-14); cen- 

 tral tooth very long and narrow, lower outer corners of base 

 of attachment expanded and the lower border with a central 

 projection; reflected portion tricuspid, the central cusp rather 

 long and narrow, the side cusps almost obsolete, the central 



Teeth and jaw of VITREA DRAPARNALDI Beck. (Original.) c, cen- 

 tral tooth; 2, second lateral; 3, third lateral; 4, first marginal; 10, seventh 

 marginal; J, jaw. 



cusp only having a cutting point; laterals similar to central but 

 wider, tricuspid, the central cusp short and wide, the inner cusp 

 the same and the outer cusp, small, placed higher up on the 

 reflection, only the central and inner cusp having cutting 

 points; the outer cusp of the second lateral is placed higher up 

 than on the first lateral, and on the third lateral has disap- 

 peared; marginal teeth of the pure aculeate form (Fig. 35). 

 There are about 40 rows of teeth. 



Distribution: Europe, America and Australia (introduced). 

 Found in the United States in the greenhouses at Seattle, 

 Washington, Oakland and San Francisco, Cal., Chicago, 111. 



Geological distribution : Pleistocene. 



Habitat: In greenhouses on plants, but more generally 

 under or about old boards in damp places. 



Remarks: This species is somewhat new to the snail fauna 

 of the United States, and has been found only in California, 



