1862.] MR. W. H. PEASE ON TWO NEW HELICTERES. 3 
culatis ; lateralibus elongatis, angustis, equalibus ; umbonibus 
inclinatis, erosis. 
Long. 22, lat. 2, diam. 1+ poll. 
Hab. In flumine Palembang prope Pardana, in insula Java (Coll. 
Prime). 
2. BaTISsSA SOLIDULA, Prime. 
B. testa ovato-orbiculari, equilaterali, crassa, solida, latere an- 
tico dilatato, postico latiore, epidermide polita atro-fusces- 
cente vel olivacea vestita ; valvis intus albis, ad margines in- 
Serne posticeque violaceis ; cardine incrassato ; dentibus cardi- 
nalibus subequalibus ; lateralibus elongatis, angustis, serrula- 
tis ; umbonibus prominentibus, integris, antice inclinatis. 
Long. 24, lat. 23, diam. 14 poll. 
Hab. ? (Coll. Cuming et Prime). 
3. PistpIUM NOV ZELANDIA, Prime. 
P. testa minuta, ovali, valde obliqua, tenui, fragili, postice sub- 
truncata, umbonibus obtusiusculis, approximatis, epidermide 
corneo-flavescente vestita. 
Long. }, lat. +, diam. 545 poll. , 
Hab. In Nova Zelandia (Coll. Cuming et Prime). 
2. Descriptions or Two New Sprecirs or Hetricrer (Acua- 
TINELLA, SWAINS.), FROM THE SANDWICH ISLANDS, WITH A 
History oF THE Genus. By W. Harper PEASE. 
We venture to add two species to the above genus, and to adopt the 
generic name given to this group by Férussac, as having priority 
over that of Achatinella of Swainson. The history of the genus will, 
we think, justify us in so doing. Not having met with any account 
of it in a connected form, we offer the following to be filled out 
hereafter by those abroad who have within their reach materials we 
cannot command in this corner of the world. 
It is not probable that any specimens of this genus were collected 
by Capt. Cook, or those attached to the expedition under his com- 
mand, as they anchored on their first visit at the most leeward island 
of the group, Kauai, and, on their return from the north-west coast 
of America, at the most windward, Hawaii, having but little or no 
. communication with the intermediate islands. With the exception 
of one species, rarely met with on the mountains in the interior of 
Hawaii, none but small ground species inhabit either of the above 
islands, the true Helicteres being confined to the central islands 
of the group. 
The earliest notice we find of any species of this genus is in the 
narrative of the first commercial expedition that visited the islands 
after their discovery by Capt. Cook. It consisted of two vessels, the 
one under command of Capt. Portlock, the other under Capt. Dixon : 
