94 TERRESTRIAL MOLLUSCA INHABITING SOCIETY ISLANDS. 
thin, concolored, and the surface is generally more or less eroded. ‘The basal keel is 
not so distinct as in the typical species inhabiting the western groups. 
O. propucra, Pease. 
Realia producta, Pease, Proc. Zool. Soc., 1864, p. 673. Pfeiffer, Mon. Pneum., iv, p. 217. 
Omphalotropis producta, Pease, Jour. de Conch., 1899, p. 151, Pl. VII, fig 8. 
Atropis producta, Pease, Proc. Zool. Soc., 1871, pp. 471, 476. 
Realia elongata, Pease, Awer. Jour. Conch , 1867, p.225. Pfeiffer, Mon. Pneum., iv, p. 218. 
Omphalotropis elongata, Pease, Jour. de Conch., 1869, p. 152, Pl. VI, fig. 4; 1871, p. 95. 
Atropis elongata, Pease, Prec. Zool. Soc., 1871, p. 476. Schmeltz, Cat. Mus. Godeff., v, 
p. 101. 
Realia scitula, Carpenter (not of Gould), Proc. Zool. Soc., 1864, p. 676. 
Hydrocena Raiatensis, Mousson, Jour, de Conch., 1869, p. 67, Pl. V, fig. 5. 
Realia Raiatensis, Pfeiffer, Mon. Pneum., iv, p. 215. 
This variable species is confined to Raiatea and Tahaa, where it is found on the 
ground in forests, and is widely diffused over both islands. 
Mr. Pease’s measurement, 104 mill., is probably a mistake. I have now before 
me over 500 examples, the largest of which is 9, and the smallest adult is 6 mill. in 
length. The first has eight, and the latter seven whorls. I note the following colors : 
whitish, pale luteous, corneous, different shades of brown, reddish brown, and very 
rarely with a narrow transverse reddish band on the body-whorl. The aperture varies 
from pale yellowish white to dark ochraceous, sometimes reddish brown or whitish. 
The penultimate whorl is frequently slightly exserted over the body-whorl, which 
latter is rounded, very rarely subangulated, and the base very narrowly perforated or 
rimate, but not keeled or angulate. ‘The epidermis, which is very rarely present, is 
thin and smooth. Sometimes the peristome is considerably expanded and the lip 
duplicated. There is also considerable variation in the convexity of the whorls. 
Mr. Pease’s producta, which he first described, differs none from his elongata, except 
having the whorls more flattened, a character which gradually merges into the latter 
species. ‘The same variation obtains in Boraborensis and terebralis. 
O. Borazsorensis, Dohrn. Plate III, fig. 60. 
Omphalotropis Boraborensis, Dobrn., Malak. Blat., 1859, p. 203. Pfeiffer, Mon. Pneum., iii, 
p- 175. Pease, Jour de Conch., 1869, p. 151. Schmeltz, Cat. Mus. Godeff., v, p. 208. 
Atropis Boraborensis, Pease, Proc. Zool. Soc., 1871, p. 476. 
Realia Boraborensis, Pfeiffer, Mon. Pneum., iv, p. 217. 
Plentiful and peculiar to Borabora, where they occur on the ground in the mountain 
forests. Mr. Schmeltz gives the wrong locality. 
The more or less conspicuous, longitudinal, elevated strize on the middle whorls 
will readily distinguish it from any other Society Islands species. The general color is 
pale corneous, sometimes whitish, brownish or brownish rose. The last whorl is more 
or less distinctly angulated a little below the middle, and frequently with a thread-like 
keel which winds up the spire. The penultimate whorl is often imbricated or exserted. 
