194 Jem and Lingual Dentition of Pulmonata, 



The result of Binnov's examination of the dentition of 

 species of the genus Achatinella, as classified by Gulick, is 

 as follows; group a, Achatinetta s. str., Bulimella, Apex, 

 Partulina, Auriculella, group &, LamtneZla, Amastra, Lept- 

 acJiatina. The subgenera of Gulick, of which the dentition 

 is unknown, are Newcombia and Qarelia. 



It will No seen that the dentition of Guliek's arboreal s. 

 genus Laminella, the species of which are said to he sinis- 

 tral, is the same as of his terrestrial s. genera Amastra ^tho 

 species with rare exceptions dextral) and Leptachatina. 



V. Martens and Gulick place various species indifferent 

 subgenera ; this surely shows that the distinctions derived 

 from consideration of shell alone are arbitrary, and the 

 limits oi' the subgenera ill defined. 



Pfeiffer, from form of shell alone (Mon. VI, 161), adopts 

 the following names for the sections in which he arranges 

 the species <^' Achatinella ; the letters a and b indicate the 

 group to which each section belongs from consideration of 

 dentition. 



,( 1. l\viuUna. b (•. . Luniiiiflla. 



a 2. Bulimella, f 7. Nevxombia, a. 



6 3. Labiella. b f 8. " b. 



(i 4. Achatinellastrum. b '.>. Leptachatina. 



(= Achatinella b. str.). a t 10. Frickella. 



b .">. Amastra. a n. Auriculella. 



