| Dentition of Pulmonate Mollusks. ON 
is long and narrow, squarely truncated below, rapidly widening 
and curving outwards at its upper third, so that the upper mar- 
gin is twice the breadth of the lower; it is rounded and reflected 
along its whole breadth ; reflection small, bearing five or more 
cusps and cutting points, the median the smallest. ‘There is 
some variation in these cusps. Of this type of jaw and den- 
tition are :— 
Partulina jucunda, Smith. W. Maui. 
plumbea, Gulick. EH. Maui. 
eburnea, Gulick. EK. Maui. 
solidissima, Smith. KE. Maui. 
solida, Gulick. Oahu. 
feniolata, Pfr. Oahu. 
marmorata, Gld. Oahu. 
pallida, Nutt. Oahu. 
Achatinella (s.s.) producta, Rve. Oahu. (PI. LI, fig. G.) 
Johnsonii, Newe. Oahu. 
livida, Swains. Oahu. 
varia, Gulick. Oahu. 
auricula, Fer. 
In the last three species, I failed to extract the delicate jaw. 
Achatinella auricula, ¥ér., on account of its having this type of 
dentition, I remove from Partula, where it is placed by von 
Martens. 
The peculiar type of dentition shared by the above species 1s 
“seen on my Pl. Ill, fig. G. (A. producta, Rve.) 
(>) Of the second type of jaw and dentition are the remainder 
of the species examined. ‘The jaw is stout, arcuate, ends blunt, 
no anterior ribs; generally a median projection to cutting edge. 
In Laminella Mastersi it is low, wide, slightly arcuate, horn- 
Wecolored; no median projection. (Pl. XVI, fig. EH.) It is the 
' same in the other species of Laminella. The same type of jaw, 
though more arched, is found in all the species of Newcombia 
and Leptachatina. In picta (Pl. XVI, fig. M) there is a slightly 
produced, blunt, median projection to the cutting edge. ‘There 
are often delicate vertical striz on this type of jaw. 
