96 
TERRESTRIAL MOLLTJSCA INHABITING SOCIETY ISLANDS. 
Itealia scitula, Gray, Cat. Than., p. 220. Pfeiffer, Mon. Pneum., iv, p. 220. 
Hydrocena acitula, Pfeiffer, Mon. Pneum., ii, p. 162. 
Atropis scilula, Pease, Proc. Zool. Soc., 1871, p. 476. Schineltz, Cat. Mus. Godeff., v, p. 102. 
This protean species is very common and widely diffused throughout all the valleys 
on the northwest part of Tahiti, and is equally as plentiful in the various valleys on 
Moorea. On the ground in forests. 
'I’hough usually cited as Gould’s scHuJa, I have serious doubts of the correctness 
of the identification. His diagnosis is as follows : — 
“ T. parva, elongato-conica, tenuis, rufo-cornea, striis incrementi tenuibus solum 
inscidpta, arete umbilicata ; spira elevata, anfr. 6-7 rotundatis, supernis subangulatus ; 
sutura profunda; apertura rotundato-ovata, parva, trientum longitudinis adaequans; 
perist. simplex, pallidum. Long. 1-5, lat. 1-10 poll.” (Gould). 
In his remarks he says: “Almost exactly like Amnvola Suyana, Anth. It is 
larger and more ventricose than C. vallatvm, and is distinguished from C. terebrale by 
its le.ss slender form and unexpanded lip.” 
The above .short diagnosis docs not agree very closely with the numerous specimens 
now before me. His dimensions are too small to accord with our shells. Neither do 
they resemble Binney’s figure of Amnicola Sayana. The only Tahiti shell that 
re.sembles Binney’s figure is Atropis BythineVoeformis, which is the same size as Gould’s 
species, but the whorls are not “supernis subangulatus.” 
'Die species under consideration is 6 mill, long and 3 mill, in diameter. The spire 
is oblong-conical with slightly convex outlines ; whorls six, convex, smooth, the penul- 
timate frequently i)ro>>cting over the suture as in terehralis, and sometimes filocari- 
nated at the angle. The last whorl is more or less distinctly angulated, rarely with 
a thread-like keel; sometimes rounded. The axis is rimate or minutely perforated 
and the margin slightly compressed, rarely filocarinated, sometimes .simple, as in 
Atropis. 1 he nearly vertical aperture is ovately rounded, with a .slight posterior angle 
and about one-third the length of the shell. 
0. OBLONQA, Pfeiffer. Plate III, fio- 59 
- ^ - - 
Omphalolropis oblonga, Pease, .lour, de Conch., 1869 p 154 
Atropis oblonga, Pease, Proc. Zool. Soc., 1871 p 476 
Heaha oblonga, Pfeiffer, Mon. Pneum., iv, p. 213. 
nZk PfZ''" i” of Moorea. 
Moore,! shells Merqr.esas Islands. The 
in referring them to his species I am^^] ^ ^^e least hesitate 
My largest exnmi.les are 7 mill' I ^ believe it only a form of soMa. 
g oxa, miles are 7 mill, long by gj in diameter, being a little larger th,an 
