I V. 



Section PARTUUNA Pfeiffer. 



/. Shells from OaJui. 



148. Achatinella dubia Newcomb. 



A. dubia Newc. V. Zool. Soc. London, 1853, p. 152, pi. xxiv, fig-. 6,s. 



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

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

 expanded, slightly 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 very 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. helena, A. phvsa and A . g-risea, all heterostrophe 

 species. — Newc. 



Hab. Waianae. — Newc. 



Dextral examples are much more common than sinistral. 



149. Achatinella morbida Pfeiffer. 



A. (Bulimella) morbida Pfr. P. Zool. Soc. London. 1859, p. 30. 



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

 fertis spiralibus sublente decussata, alba, fusco 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, bre vis, obli qua ; apertura obliqua, obauriformis ; perist. incrassatum, 

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

 diam. 9 mill. 



Shell subperf orate, 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) 



