lY. 



Skctiox PARTUI/INA Pi-kifi-hr. 



/. S//r//s f)n}u OaJiu. 



148. Achatinella dubia Newcomb. 



A. dubia Xewc. P. Zool. Soc. London, 1S53, p. 152, pi. xxiv, fig. 65. 



Shell dextral or sinistral, thin, conically elongate ; whorls 6, 

 with finely decussating striae ; suture simple ; aperture ovate ; lip 

 expanded, slightl}' reflected ; columella white, bulimoid except in 

 adult specimens (which exhibit a callus); umbilicus small and 

 perforate ; colour light corneous with radiating zigzag lines and 

 blotches of a light colour. Long. 16/20, lat. 7/20 poll. 



The above shell approaches in its characters ver}- near to the 

 genus Bulimus. It is referred to this genus from its disposition to 

 be either sinistral or dextral ; from its animal being viviparous ; 

 and from old specimens exhibiting a flat, twisted columellar tooth. 

 It forms the terminus of a series of four species herein described ; 

 the others are A. helejia, A. physa and A. grisea, all heterostrophe 

 species. — Newc. 



Hab. Waianae. — Newc. 



Dextral examples are much. more common than sini.stral. 



149. Achatinella morbida Pfeiffer. 



A. {BuUniclla) morbida Pfr. P. Zool. Soc. London, 1859, p. 30. 



T. subperforata, sinistrorsa, ovato-turrita, .solidula, striata tt .striis con- 

 ferlis spiralibus sublente deciissata, alba, fu.sco varie strigata et fasciata ; 

 spira elongata, gracilis, apice acutiuscula ; sutura simplex ; anfr. 6 1-2 vix 

 convexiusculi, ultimus spira paulo brevior, convexus ; plica columellaris 

 alba, brevis, obliqua ; apertura obliqua, obauriforinis ; perist. incrassatiim, 

 breviter expansum, niargine columellari perdilatato, late adnato. Long. 19, 

 diam. 9 mill. 



Shell subperforate, sinistral, ovate-turreted, somewhat solid, 

 striate and under a lens decussate with close spiral striae, white, 

 variously striped and banded with brown ; spire elongate, slender, 



(96) 



