TERRESTRIAL MOLLUSCA INHABITING SOCIETY ISLANDS. 37 
the columella, two short conspicuous ones in the palate between the keel and base, 
and a less conspicucus one above ; peristome thin, straight, the lower margin contin- 
uous with the umbilical constriction ; columelia short, concave, receding. 
Major diam. 55, height 25 mill. 
Hab.—Moorea. 
Very abundant beneath decaying vegetation, and restricted to the lower part of 
one valley on the west side of Moorea, and the only species found in that location. 
The deflection of the last whorl below the periphery of the penultimate whorl, 
which is an accidental character in some of the species, is constant in this. The per- 
sistence of this feature, together with the fine, crowded strive, dark color, absence of 
concentric lines, as well as difference in the internal laminz, are its most essential 
characters. 
Genus ENDODONTA, Albers. 
This genus was instituted by Dr. Albers for a peculiar group of small Helices 
inhabiting the Sandwich Islands, the type of which is Helia: lamellosu, Fer. Five 
species are known to inhabit that group ; all of which are characterized by their len- 
ticular form, acutely carinate periphery, large umbilicus, subrhomboid or securiform 
aperture, which is garnished with two parietal, one columellar, and three or four 
palatal lamin. 
Some of the Society Islands species are very closely related to the Sandwich Islands 
shells in shape, and the existence of one or more deeply seated lamine in the palate ; 
the latter character was overlooked by Pfeiffer, Pease, and the writer, when describing 
the different species inhabiting the group. 
They are all very widely umbilicated, the last whorl carimated or angulate, and all, 
with one exception, have one or two parietal lamine ; the lower one, when two are 
present, is always shorter, and owing to its being deeply seated has hitherto been over- 
looked. The aberrant species are Helix fubrefucta, Pease, which is without laminze, and 
H. obolus, Gould, which has a single one on the parietal region; otherwise the shape 
of the shells is quite similar to the others. The lamin are not so prominent as in 
the typical species, and are distinctly represented in the different stages of growth, 
but, excepting those on the last two whorls, are gradually absorbed by the animal. 
They inhabit all the islands except Tahiti and Moorea, where they are represented 
by a distinct group of Helices, the type of which is Helix bursatella, Gould. ‘They 
are all ground species, and are very numerous in certain favorable localities. 
BE. Huanernensts, Pfeiffer. Plate II, figs. 26, 26a, 26 b, 26 c. 
Helix Huaheinensis, Pfeiffer, Zeit. Mal., 1853, p. 55; Mon. Hel., iii, 640. 
Endodonta Huaheinensis, Pfeiffer, Vers., p.129. Albers, Die Hel., ed. 2, p.9. Pease, Proc. 
Zool. Soc., 1871, p. 474. Paetel, Cat. Conch., p. 91. 
Patula Huaheinensis, Schmeltz, Cat. Mus. Godeff., v, p. 93. 
This species is abundant in all the large valleys on Huaheine. Though widely 
6 JOUR. A. N. S. PHILA., VOL. IX. 
