HAWAIIAN NESOPUPAE. 305 



Hawaii: Olaa (D. Thaanum), type 18701 Bishop Museum, 

 topotypes 44678 A. N. S. P.; Glenwood, in moss on tree 

 trunks, abundant (Thaanum, Pilsbry). 



Nesopupa thaanumi (ANCEY), Proc. Malac. Soc., London, vi, 

 Tune 1904, p. 123. 



Unfortunately the holotype from the Ancey collection is 



yadly broken. This species is very abundant in the type 



ocality, where it is found on tree-trunks, living among and on 



-he fronds of a loose-growing species of moss. Under similar 



onditions this species has been found in nearly all the 



1 Hawaiian Islands. P. thaanumi is somewhat similar to P. 



uesleyana tryphera. Its shell is, however, smaller, more com- 



)actly coiled, much lighter colored and the aperture is more 



Crowded w r ith the five lamellae. It has apparently some re- 



ationship to the species included in Nesopupa ss. It differs 



Tom all the species of the latter by its more convex whorls 



ind especially by the membranous character of its rather dis- 



ant riblets. Immature specimens from the type locality have 



lie embryonic whorls very minutely spirally striate. The 



ingular lamella is strong, long and slightly sinuous, high in 



'ront, tapering gradually backward, and does not terminate 



>n nor is it joined to the outer lip, but extends to the margin 



>f the parietal wall. In this character it resembles species of 



\esopupa ss. with this distinction: that in thaanumi this 



amella is stronger, with a more sinuous margin and the outer 



ortion is not parallel to the parietal, but is distinctly bent 



owards the outer lip. The parietal lamella is only slightly 



:iore deeply seated than the angular, and emerges almost to 



he margin on the parietal wall. It is very strong, high and 



Dug, and is nearly perpendicular to the parietal wall. The 



olumellar lamella is very strong, horizontally seated, rather 



>ng, diminishing rather abruptly inward, there turning up- 



. r ards and accompanying the columella as a mere thread. The 



wo palatal folds are nearly parallel, about equal in height 



nd length ; the lower slightly more deeply seated ; the upper 



xtendirig nearly to the margin of the outer lip, with its free 



dge abruptly bent, almost at a right angle, towards the 



)wer palatal. 



-' 



