21 



Shell elongate-ovate; whorls 6, rounded; suture above lightly 

 impressed, becoming deep at the junction of the last whorl ; aper- 

 ture small, ovate ; lip simple ; columella with a twisted plait ; the 

 last whorl contracted and covered with a dense black epidermis ; the 

 superior whorls white, with numerous arrow-headed brown markings. 



This shell is intermediate between A. modesta of Adams, a Molokai 

 species, and A. assimilis, the following species. 



50. ACHATINELLA JoHNSONi (PL XXIII. fig. 50). A. testa dex- 

 trorsa, elongata conica ; anfractibus 7, subrotundis, superne leviter 

 submarginatis ; sutura prof undo. ; apertura subovata ; columella 

 valde plicata, rosea cum margine nigro; colore testa albo vel roseo 

 cum 2 out pluribus lineis nigris, quarum singula vel duo cen- 

 trales, cum alia suturali et alia plerumque ampliori infra anfr. 

 ultimum. 



Hab. Kolau, Oahu. 



Shell dextral, conically elongate ; whorls 7, slightly rounded, supe- 

 riorly indistinctly margined ; suture rather deep ; aperture subovate ; 

 columella with a strong plication, pink, margined with black ; colour 

 of shell white or pinkish, banded with two or more narrow black lines, 

 one or two of which are central, one sutural, and one usually broader 

 inferiorlv on the last whorl. 



The following form an alliedgroup : A.producta, hybrida, aplustre, 

 venulata and Johnsoni. 



This species is dedicated to the Rev. Mr. Johnson, of Kawai, whose 

 assistance in my researches I most thankfully acknowledge. 



51. ACHATINELLA APLUSTRE (PL XXIII. fig. 51). A. testaco- 

 nica, dextrorsa; anfractibus 7, rotundis ; sutura leviter impressa, 

 simplici; apertura semiovata; labro tenui; columella callosa, inpli- 

 cam tortam lerminante ; colore albo-cceruleo in apicefusco ; anfr. 

 3 primis spiralibus albidis, reliquis vitta ampla centrali coloris 

 rosei et binis fasciis nigris marginalibus ornatis anfr. ultimo. 



Long. 1 ; lat. g poll. 



Hab. Kolau, Oahu. 



Shell conical, dextral ; whorls 7, rounded ; suture moderately im- 

 pressed, simple ; aperture semiovate ; lip thin, with a callus, termi- 

 nating in a twisted plait, bluish white tipped with brown ; three first 

 spiral turns white, the others with a broad central pink band, mar- 

 gined by two deep black bands ; on the last whorl, superiorly and in- 

 feriorly, is a broad bright green band. 



The gaudy colouring of this species alone separates it from the 

 A. Johnsonii, Nob. It belongs to the same section with A.producta, 

 Reeve, which may be taken as the type of a group of species num- 

 bering some half-a-dozen, and which requires still further additions 

 to render it complete.. >, . <^ ^ ,c f , t .~rf '-^- <> nt.,^ J*2 "* /**' 



52. ACHATINELLA HYBRIDA (PL XXIII. fig. 52). A. testa dex- 

 trorsa, conica ; anfractibus 6, rotundis, superne marginatis ; ul- 



