TERRESTRIAL MOLLUSCA INHABITING SOCIETY ISLANDS. 39 
have the riblets more distant than others. Examples with receding body-whorl are 
not infrequent. A variety (local) occurs which is uniform whitish. 
L. RetTuNSA, Pease, Plate IT, fig. 8. 
Helix retunsa, Pease, Proc. Zool. Soc., 1864, p. 670. Pfeiffer, Mon. Hel., v, p. 220. 
Pitys retunsa, Pease, Proc. Zool. Soc., 1871, p. 475. 
Mr. Pease’s type specimens were collected by me on the south side of Tahiti, 
where it is not uncommon beneath rotten wood. 
This remarkable shell differs from the preceding species in having rounded whorls, 
the last one neither carinated nor angled, and in the absence of the lamina in the 
palate. ‘The spire, which is more or less elevated, is truncate, dome-shaped ; whorls 
6-7, cancellated with fine, crowded, revolving, raised lines, and radiating, distant, 
delicate, obliquely curved riblets. Parietal region with a single, elongate lamina, 
and a small one on the columella. Color whitish or yellowish horn-color, above 
tessellated, and the base with waved, radiating stripes, reddish brown. 
Diam. 4, height 2-3 mill. 
L. HeyneMAnnt, Pfeiffer, Plate IT, fig. 9. 
Helix Heynemanni, Pfeitter, Mal. Blat., 1862, p. 151; Mon. Hel., v, p. 219. 
Pitys Heynemannt, Pease, Proc. Zool. Soc., 1871, p. 475. 
Patula Heynemanni, Schmeltz, Cat. Mus. Godeff., v, p. 93. 
Helix bursatella, Gould (part), Proc. Bost. Soc. Nat. Hist., 1846, p. 175. 
Very abundant in several valleys on the northwest part of Tahiti, where they live 
beneath loose stones and decaying wood. 
There is not the slightest doubt in respect to this common species having been 
collected by Wilkes’ naturalists, who carefully explored that part of Tahiti. Examples 
sent to Mr. Pease were by him referred to bursatella, Gould. Some sent to one of my 
English correspondents were also referred to Gould’s species. On the other hand, a 
lot forwarded to the Museum Godeffroy, were by Prof. Mousson identified with 
Pfeiffer’s Heynemanni. 
Although Mr. Pease quotes Heynemanni as distinct, yet it is evident from his 
remarks on the Tahiti species that he did not identify the shells received from me as 
being that species. 
It may be characterized by its exceedingly fine transverse and revolving raised 
strize, which are so closely set as to impart a silky lustre to the shell. Pfeiffer, who 
does not allude to the concentric lines, merely says “‘leviter striata.” The spire, which 
varies slightly in height, is depressed dome-shaped, whorls 6-7, nearly planu- 
late, submargined, the last one not descending and acutely carinated. ‘The convex 
base is cancellated the same as above. There are two parietal laminz, the lower one 
the shorter, four in the palate, three conspicuous, deep-seated, beneath the keel, and 
one above not so conspicuous and sometimes obsolete. A small one on the columella. 
Color whitish or luteous, rarely uniform brownish, generally profusely spotted and 
