308 PARTULA, CAROLINE ISLANDS. 



Aperture oblong- rounded, nearly vertical; peristome buff, 

 brownish, broadly expanded throughout, right lip nodose with- 

 in. Length 30, diam. 16, aperture with peristome 17 mm. 

 long, 5 mm. wide inside. 



The following varieties occur: b. more elevated, the last 

 whorl less convex, g. suture more striolate, d. color paler, 

 yellowish-fawn (fig. 4). (0. Semper}. 



Pelew Islands: Pelelu. (C. Semper). 



P. thetis SEMP., t. c., p. 419, pi. 12, f. 6. 



This third species, according to Semper, is not quite so thin 

 as the other two. The aperture is a little rounder, and the 

 summit is mamillate, a feature totally wanting in the two 

 other species. 



A specimen before me, figs. 5, 6, no. 4272 Carnegie Mus., 

 is distinctly streaked with greenish-corneous and whitish on 

 the last whorl, growing ruddy on the spire. The apical 

 whorls are very high, much as in P. brazieri (pi. 33, fig. 2) . 

 The rest of the whorls are very distinctly and beautifully 

 sculptured with close, deeply engraved spiral lines. The lip 

 is thin throughout, not perceptibly thickened within, and 

 tapers rapidly from the upper third to the insertion. The 

 columella is straight and vertical. Length 30, diam. 15, 

 aperture 16.2x10 mm., including peristome; 6 whorls. 



XII. CAROLINE ISLAND SPECIES. 



Section CAROLINELLA n. sect. 



Rather solid, opaque, ventricose shells, with the aperture 

 large and simple, umbilical area small; general shape Buli- 

 moid. Type P. guamensis Pfr. 



This Caroline Island group consists of rather large Partulas 

 with a quite distinct aspect. They look like ground snails. 

 P. gonochila and P. lutea have much the same form, but are 

 smaller shells. P. lineata is a small, banded species of quite 

 different type. 



105. P. GUAMENSIS (Pfeiffer). PI. 38, figs. 7 to 14. 



Shell rimate-perforate, ovate-conic, rather solid, very deli- 



