236 PROCEEDINGS OF THE ACADEMY OF 



Fig. 2. Limax Hewstoni, J. G. Coop. 



a. Central and first lateral teeth. 



b. Extreme marginals. 

 Fig. 3. Limax agrestis, Lin. 



a. Central and first lateral teeth. 



b. First marginal teeth. 



c. Last three marginals. 

 Fig. 4. Limax maximus, Lin. 



a. A group of central and adjacent laterals. 



b. A marginal tooth before the commencement of the 



bifurcation. 



c. An extreme marginal, showing the bifurcation. 

 Fig. 5. Limax campestris, Binney. Same references as in fig. 1. 

 Fi. 6. Vitrina Pfeifferi, Newc. 



a. Central and lateral teeth. 

 6. Extreme marginal. 

 Fig. 1. Vitrina exilis, Mor. 



a. Central and lateral teeth. 



b. First marginals. 



c. Last marginals. 



Fig. 8. Vitrina limpida, Gould. Same references as in fig. 6. 



Plate V. 



Fig. 1. Ariolimax Californicus, J. G. Cooper. 



a. Central and first lateral teeth. 



b. Marginal teeth. 



Fig. 2. Ariolimax niger, J. G. Cooper. Extreme marginal teeth 



of an exceptional form. 

 Fig. 3. Ariolimax niger, J. G. Cooper. Same references as in 



fig. 1. 

 Fig. 4. Prophysaon Hemphilli, Bl. and Binn. Same references 



as in fig. 1. 

 Fig. 5. Arion hortensis, Fdr. Same references as in fig. 1. 



c. Extreme marginal. 



Fig. G. Ariolimax Columbianus, Gld. 



a. Central and first lateral teeth. 



b. c. Transition teeth from laterals to marginals. 



d. Marginal tooth. 



e. Extreme marginal tooth. 

 /. Marginal tooth in profile. 



