230 AMERICAN JOURNAL 



thin, white, shining, translucid ; whorls 4, roundly convex at the 

 suture, somewhat roundly angulate ; suture well impressed; 

 ribs prominent, straight, vertical, about 20 in number ; peristome 

 Continuous, on its outer edge rather thin, slightly expanded, on 

 the columella side callously thickened ; aperture vertical, oval, 

 very slightly porrected. 



Truncatella Pacifica, Pease. — Plate 15, fig. 27. 



Description. — T. subrimata, cylindracea, truncata, sursum 

 leviter attenuata, solidiuscula, nitidula ; costis verticalis, promi- 

 nentis, paulum curvatis, numero apud 25; sutura impressa ; 

 anfr. 4-5, subconvexis, ultimus basi rotundato-carinatus ; aper- 

 tura verticalis, angulato-ovalis ; perist continuum expansius- 

 culum, adnatum ; alba, aut pallide rosacea. 



Dimensions. — Diam. 3, alt. 8 mill. 



Habitat. — In Insula Oualan. 



Shell subrimate, cylindrical, truncate, spire slightly attenuate, 

 rather solid, shining; ribs vertical, prominent, slightly curved, 

 in number about 25 ; suture impressed ; whorls 4-5, somewhat 

 convex, the last roundly carinate at base, at the umbilical 

 region ; aperture vertical, angulately oval ; peristome con- 

 tinuous, slightly expanded, united with the penultimate whorl. 

 White or pale tiesh color. 



Partula assimilis, Pease. — Plate 15, figs. 28, 29. 



Description. — T. elongato-ovata, tenuiscula, nitida, anguste 

 umbilicata ; anfr. 4J, rotundato-convexis, sublente spiraliter 

 striatis, striis coufertis, vix undulatis, ultimus leviter inflatus ; 

 sutura impressa ; apertura ovalis, obliqua ; pallide straminea, 

 apice rufo-fuscescente, interdum longitudinaliter flammis cas- 

 taneis nicta et labro colore tincto. 



Dimensions. — Diam. 9, alt. 17 mill. 



Habitat. — In Insula Roratonga. 



Shell elongate ovate, rather thin, shining, narrowly umbili- 

 cate ; whorls 4J, roundly convex, minutely concentrically striate, 

 strife close and somewhat undulating, the last whorl slightly 

 inflated; suture impressed; aperture oval, oblique ; pale straw 

 color ; apex dark reddish brown, sometimes ornamented with 

 longitudinal reddish brown flammules or stripes, and the lip 

 colored. 



Remarks. — This species can scarcely be distinguished from a 

 certain variety of P. varia, Brod., which inhabits Huaheine 

 (Tahitian Group). Comparing large numbers, the above is more 

 abbreviate, whorls more convex, and the aperture narrower. 



