64 ACHATINELLIDiB. 



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. 



Family ACHATINELLID^. 



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, Swaiusou, 1828. 



/St/n.— Helicter (Per., 1819), Pease, 1862. 



Distr. — 300 sp. Sandwich Islands. 



Shell conical, smooth, generall}^ small, dextral or sinistral, 

 imperforate, banded, striped and spotted with bright colors ; 

 whorls six or sevqn ; 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. 



Ovo viviparous. 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, Pfciffer, .1854. (AchatinelW, 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. pallid a, l^utt. (s.cix, ^2). 9 sp. 



BULiMELLA, PfeiflTcr, 1852. Shell conical, frequently sinistral; 

 columella short, not truncate ; outer lip thickened within, not 

 expanded. A. bulimoides, Swains. 41 sp. 



NEWCOMBiA, Pfeiffer, 1852. Shell conical, turriculated, sinistral ; 

 whorls with revolving raised sharp lines ; columella somewhat 

 straight, callous ; lip simple, sharp. A. plicata,M[ghe\s (xcix, 

 18). 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, Per. (xcix, 14). 21 sp. 



PRiCKELLA, Pfeiffer, 1855. Subumbilicated, oblong, conic ; a 



