27 



strorsa, infra inflata, in apice acuminata ; anfractibus 6, rotundis, 

 non marginatis ; apertura ovata ; columella brevi, plana et sub- 

 plicata ; labro expanse, interne incrassato ; sutura bene impressa ; 

 umbilico subaperto ; colore supra cinereo-albo, fuscopallide macu- 

 lato, infra cinereo ; anfractu ultimo vitta angusta albida circum- 

 dato. 



Long. ;lat. 1 poll. 

 Hab. Makawao, Mani. 



Shell sinistral, inflated below, pointed at the summit ; whorls 6, 

 rounded, not margined ; aperture ovate ; columella short, flat and 

 but slightly twisted ; lip expanded, thickened within ; suture well- 

 impressed ; umbilicus open ; colour above greyish white mottled with 

 light brown, below of an ashy grey ; the body whorl encircled by a 

 narrow white band. 



This species belongs to the beautiful group of thin shells made up 

 of the following species : A. Helena, A. physa and A. dubia. 



^ 67. ACHATINELLA MASTERSI (PL XXIV. fig. 67). A.testadex- 

 trorsa, tenui, conica ; anfractibus 7, rotundis, supra Icviter ru- 

 gosis, inferior ibus fortiter inflatis ; apice acuto ; sutura valde im- 

 pressa ; apertura ovata ; labro simplici ; columella brevi, cum 

 plica lamellari tenui; colore superbo castaneo vel albo, cum 

 vestigiis epidermatis tenuis fusco-nigris ; intra albo vel cteruleo- 

 evanido. 



Long. J5;lat.4 poll. 

 Hab. Mani. 



Shell dextral, thin ; whorls 7, rounded, slightly rugose above, the 

 last strongly inflated ; apex acute ; suture well-impressed ; aperture 

 ovate ; lip simple ; columella short, with a thin lamellar plait ; colour 

 of shell white or rich chestnut, with traces of a thin brown epidermis ; 

 within white or bluish white. 



This species I dedicate to S. I. Masters, Esq., who has been inde- 

 fatigable in his researches on the islands of Oahu, Mani and Ranai, 

 and who has furnished many choice and beautiful shells of this genus 

 before unknown to science. 



The size varies much in this species, and the colouring is also 

 various, running from pure white through various tints to a light ma- 

 hogany. The lower part of the shell is not unfrequently white, and 

 the upper portion bright chestnut or rose-coloured. 



* 68. ACHATINELLA DECIPIENS (PL XXIV. fig. 68). A. testa co- 

 nico-elongata, solida ; anfractibus 6, subrotundis, supra depressis ; 

 apertura elongato-ovata ; labro subreflexo ; columella brevi, ob- 

 lique plicata, cum callo expanso ; sutura subimpressa ; striis nume- 

 rosis, longitudinalibus, obliquis ; colore albo cumfasciis transver- 

 sis luteis, vel luteo cum lineis transversis albidis, et striis longi- 

 tudinalibus castaneis. 

 Long. j|;lat. poll. 

 Kahana, Oahu. 



