64 ACHATINELLID&. 
flat whorls; last whorl concave at the base, perforated and cari- 
nated at the periphery ; aperture subquadrate, small; columella 
thickened, arcuated, subtruncate below; outer lip thin, slightly 
reflected. 
Famity ACHATINELLID A. 
Shell small, bulimiform, dextral or sinistral, columella plicate- 
truncate, lip usually thickened within. 
Jaw finely striated or costulated ; teeth sometimes in oblique 
rows, with narrow base and reflected, many-toothed margins, 
sometimes subhorizonal, with central and lateral teeth like 
Achatina, the marginals multicuspidate. 
ACHATINELLA, Swainson, 1828. 
Syn.—Helicter (Fer., 1819), Pease, 1862. 
Distr.—300 sp. Sandwich Islands. 
Shell conical, smooth, generally small, dextral or sinistral, 
imperforate, banded, striped and spotted with bright colors; 
whorls six or seven; columella short, callous or dentate at the 
base or in the middle, and very often tortuous; aperture small ; 
peristome simple, not reflected, but thickened within. 
Ovoviviparous. Confined to the Sandwich Islands, where 
they live principally among the foliage of bushes in shady places 
near the sea. No shells exceed these in the beauty and variety 
of the painting. Since the introduction of cattle into the islands 
they are becoming exterminated by the destruction of the foliage 
upon which they feed. The species being founded mostly upon 
the character of coloration, have been unnecessarily multiplied, 
as there is evidently considerable variation of coloring in the 
same species. 
ACHATINELLASTRUM, Pfeiffer, 1854. (Achatinella, restricted.) 
A. pulcherrima, Swains. (xcix, 73). 50 sp. 
PARTULINA, Pfeiffer, 1852. Shell conical, frequently sinistral ; 
columella tortuous, not truncate; outer lip thickened within, 
expanded. A. pallida, Nutt. (xcix, 72). 9 sp. 
BULIMELLA, Pfeiffer, 1852. Shell conical, frequently sinistral ; 
columella short, not truncate; outer lip thickened within, not 
expanded. A. bulimoides, Swains. 47 sp. ° 
NEWcoMBIA, Pfeiffer, 1852. Shell conical, turriculated, sinistral ; 
whorls with revolving raised sharp lines; columella somewhat 
straight, callous; lip simple, sharp. A. plicata, Mighels (xcix, 
78)... 8)sp. : 
AURICULELLA, Pfeiffer, 1855. Shell subperforate, oblong-conic; 
apertural paries furnished with an intrant, spiral lamella; colu- 
mella with the anterior plait dentiform or obsolete ; peritreme a 
little expanded. A. auricula, Fer. (xcix, 74). 21 sp. 
FRICKELLA, Pfeiffer, 1855. Subumbilicated, oblong, conic; a 
