28 
TERRESTRIAL MOLLUSCA INHABITING SOCIETY ISLANDS. 
and fasciation ; they vary some in the elevation of the spire. The various species of 
tliis genus are so closely allied that it is difficult to express in words the specific 
differences. 
Compared with pallens it is smaller, color different, the band always narrow, and 
the umbilical region more excavated. The whorls are also a little more flattened. 
The obliquely arched columella will at once separate it from trochiformis. 
Oenus UATUnA, Ueld. 
P. -MODiCELLA, Ferussac. 
Helix modicella, Fer., Mus. Deshayes, in Ferussac’s Hist. Moll., i, p. 90, PI. LXXXVI, 
fig. 3. Pfeiffer, Mon. Hel., iii, p. 92 ; vii, p. 149. (Pafula) Paetel, Cat. Conch., p. 92. 
Nanina modicella^ Gray, Cat. Pulm., p. 129. 
Pityg modicella, Pease, Proc. Zool. Soc., 1811, p. 414. 
Patula modicella, Sclimeltz, Cat. Mus. Gocleff., v, p. 93. Moiisson, Jour, de Conch., 1813. 
p. 104. 
Pithyg Atiemis, Pease, Jour, de Conch., 1810, p. 394. 
Pitys Atiensis, Pease, Proc. Zool. Soc., 1811, pp. 453, 414. 
Patula Atiengia, Garrett, Jour. Acad. Nat. Sci. Phila., 1881, p. 386. 
Helix Atiensig, Pfeiffer, Mon. Hel., vii, p. 165. 
Patula vicaria, Mousson, Jour, de Conch., 1811, p. 11, PI. HI, fig. 2 ; 1813, p, 104. Schracltz 
Cat. Mus. Godeff., v, p. 93. ’ 
Helix vicaria, Pfeiffer, Mon. Hel., vii, p. 181. {Patula) Paetel, Cat. Conch., p. 93. 
This species, which is distributed throughout the group, is found adliering to tlie 
under side of dead wood in the lowland forests. It appears to be more rare in tlie 
Panmotus, and is widely diffused over the Harvey Islands. I also obtained it in the 
onga, and Dr. Graffc gathered examples in the low coral islands of the Ellice -roup 
winch gives it a wider range than any other Polvnesian species ^ ’ 
and this species, copies De.shaves’ description 
mo":- as i,s habitat. He' describos’it ai 
anfr" temiUsima striata, late umbilicata, corneo-fulva ■ 
— ---- — 
are novot, boles, foe, aon.lv olaZ; d ^ 
tions. Tlio four and a half whorl. ^ ^ tessella- 
apiro is sliffhtly ooavev or plam,l„to“%ZZs'' ^ “ ^““"*<1 s„,„r„I li„e. The 
above the iioriphcry and thn ^ ‘Convex, last one moderately flattened 
riblots. which arc very slightlv biaZaTr' The 
of the major diameter of the' shell. ' P^i^Pectne umbilicus is nearly a third 
