292 ACHATINELLA VITTATA. 



appearance and spreading of the dark bands. Probably is 

 confined to the district mentioned above. 



33&. A. vittata simulans Eeeve. PL 57, figs. 8 to 14c. 



1 ' Shell globosely conical, sinistral, sharp towards the apex ; 

 whorls conspicuously margined at the sutures; columella 

 short, flatly callous; white, encircled with a few light-brown 

 lines, with an intense brown band around the columella; lip 



and columella tinged with light purple. Hab. ? Mus. 



Cuming " (Veeve). 



Oahu : Nuuanu-Kalihi ridges, high up, especially around the 

 heads of Waolani and Kapalama valleys. 



Achatinella simulans REEVE, Conch. Icon., vi, pi. 2, f. 15, 

 April, 1850. PPE., Monographia iv, p. 528, exclusive of var. b. 

 Achatinella decora Fer., EEEVE, Conch. Icon., pi. 2, f . 12<j, &. 

 THWING, Original Descript., etc., p. 16, pi. 1, f. 3. Apex 

 albofasciata SMITH, P. Z. S., 1873, p. 78, pi. 9, f. 21. Cf. 

 THWING, Orig. Descriptions Achatinella, p. 17. 



A. v. simulans differs from vittata and cinerea by its snow- 

 white ground-color with almost black lines and bands, and the 

 usually more solid and robust shell. There is, however, varia- 

 tion in the color of the bands. The type specimen, pi. 57, fig. 

 8, reproduced from Reeve's plate, was a rather small shell 

 with few bands except close to the lip, where numerous chest- 

 nut-brown bands appear, as in pi. 57, fig. 9. Reeve 's A. decora 

 is merely a larger, more copiously banded form of the same 

 race. 



Ordinarily the bands and lines are almost black, various 

 in number and arrangement, rarely confluent, sometimes 

 wanting except at the extreme base. They do not spread or 

 increase in number behind the lip in the vast majority of 

 shells, the type of simulans and fig. 9 being quite exceptional. 

 There is no dark streak behind the lip, and the dark apical 

 mark is invariable. A tawny band below the suture is only 

 rarely developed. The spire has slightly concave outlines in 

 most specimens. The basal lip and part of the columella are 

 purplish lilac. Specimens from near and at the summit of the 

 ridge, above the head of Waolani are figured, pi. 57, figs. 10 



