Jaw and Lingual Dentition of Pulmonata. 194 
The result of Binney’s examination of the dentition of 
species of the genus Achatinella, as classified by Gulick, is 
as follows; group a, Achatinella s. str., Bulimella, Apex, 
Partulina, Auriculella, group 6, Laminella, Amastra, Lept- 
achatina. ‘The subgenera of Gulick, of which the dentition 
is unknown, are Newcombia and Carelia. 
It will be seen that the dentition of Gulick’s arboreal s. 
genus Laminella, the species of which are said to be sinis- 
Kira is the same as of his terrestrial s. genera Amastra (the 
species with rare exceptions dextral) and Leptachatina. 
V. Martens and Gulick place various species in different 
subgenera; this surely shows that the distinctions derived 
from consideration of shell alone are arbitrary, and the 
limits of 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 of Achatinella; the letters a@ and 0 indicate the 
group to which each section belongs from consideration of 
dentition. 
ai. Partulina. b 6. Laminella. 
a 2. Bulimella. ? 7. Newcombia, a. 
b 38. Labiella. De ' sic b. 
a4. Achatinellastrum. b 9. Leptachatina. 
(= Achatinella s. str.). a ? 10. Frickella. 
b 5. Amastra. @ ll. Auriculella. 
