1 6 University of Michigan 



Orthalicinas appear to substantiate this idea. Vestigial or rever- 

 sional characters are, as a general rule, more variable than new 

 ones. In addition, the sporadic occurrence of these teeth in 

 several genera appears to be most easily explainable by the 

 hypothesis that they may represent an approximation to the 

 ancestral laterals of this subfamily. In younger radulae (from 

 specimens of three whorls) some of the outer teeth are more 

 pointed than is usual in the older specimens, but the aculeate, 

 lateral teeth do not appear to be much more common. 



VAGINULIDtE 

 Vaginnla moreleti Crosse and Fischer (1872). Occurs 

 practically everywhere, but noted in greatest abundance in the 

 grass along the edges of cleared (H, ii, c) and partially cleared 

 (H, ii, a) fields and in the sugar-cane plantings. It is appar- 

 ently almost noctural in habits, as it was usually collected on 

 wet mornings ; but it was also found moving about on rainy 

 days. In addition to these artificial habitats, it was collected 

 from the lowland jungles, mainly on the ground (H, i, a), but 

 also up on the vegetation (H, i, b) ; from the grass on the 

 open savannahs (H, iv) ; and from the ground (H, iii, a) and 

 low vegetation (H, iii, b) in the savannah brush. 



