84 MOLLUSCA. 
a single lamina on the last whorl revolving within the shell; peri- 
stome moderately reflexed, the outer lip inclining somewhat inwards. 
Length one-eighth of an inch; breadth one-fourth of an inch. 
Found at Metia Island, under stones. Couthouy. 
This little species bears all the characters of the group, and is by 
far the most minute species yet described. 
Figure 90, the shell enlarged ; 90a, natural size. 
Partuta Tanetrana, Bruc.; Encyc. Meth., i. 347. DeEsu.; in 
Lam. An. sans Vert., viii. 281. Lxrsson; Voy. de la Cogq,, pl. 7, figs. 
6,7. Partula auriculata, Brop.; Proc. Zool. Soc., 1832. REEVE; 
Conch. Syst., pl. 175, f.7, 8. Bulimus auriculatus, PFerrer; Symb. 
SOs late 
Animat yellowish, tentacles and line along the back of neck dusky ; 
surface finely reticulated. 
The genus Partula seems to be peculiar to the islands in the Pacific 
Ocean, such as the Society, Friendly, and Navigator’s Islands. A 
single living specimen of this species, however, was found near Hono- 
lulu, in the valley of Nuuanu. As this is the only one in the collec- 
tion of the Expedition, and the only one I have any knowledge of, 
from that island, I think it must be regarded as a straggler, accident- 
ally introduced. We should, however, except P. Owazhiensis, which 
abounds at the Sandwich Islands, but which, from its peculiarities, 
has been placed in the new genus Tornatellina. The animal of Par- 
tula presents no external characters to distinguish it from Bulimus ; 
but its internal organization and natural habits would, we think, indi- 
cate distinct characters, as the isolation of the group would lead us to 
anticipate. 
Figure 91, shell, with the animal. 
