OF CONCHOLOGY. 155 



Shell very thin, fragile, pellucid, shining, smooth, glassy, 

 somewhat orbicular in shape, pale green ; spire but slightly 

 elevated, obtuse ; whorls 4, slightly convex, last broadly rounded ; 

 suture distinct, impressed ; aperture slightly oblique, roundly 

 oval. 



Vitrina fusca, Pse. Plate 12, fig. 6. 



Description. — T. tenuis, pellucida, nitida, laevigata, fusca, basi 

 interdum flavescente aut viridescente, suborbicularis ; spira vix 

 elevata obtusa ; anfr. 4, convexiusculis, ultimo late rotundato ; 

 sutura impressa ; apertura ovali-rotundata. 



Dimensions. — Diam. 10, alt. 7 mill. 



Hab. — Insl. Marquesas. 



Shell thin, pellucid, shining, smooth, smoky brown, base 

 sometimes of a yellowish or greenish tint, suborbicular ; spire 

 slightly elevated, obtuse ; whorls 4, slightly convex, the last 

 broadly rounded; suture impressed, aperture roundly oval. 



Remarks. — The above two species are closely allied to each 

 other, the latter differs only in being rather more thick and of a 

 different color. They are the first of the genus discovered in 

 Polynesia. 



Partula strigata. Plate 12, fig. 7. 



Description. — T. oblongo-ovata, tenuiscula, angusteumbilicata, 

 longitudinaliter tenuiter et irregulariter rude striata, transversim 

 confertim et undulatim striata ; anfr. 4|, convexis, spira brevis, 

 sutura impressa; apertura obliqua, oblongo-ovata; labro calloso, 

 asqualiter et p-lanulato-reflexo ; columella superne vix dilatata ; 

 spadicea, obscure fusco strigata, labro apertura que fuscis. 



Dimensions. — Long. 19, diam. 12 mill. 



Hab. — Insl. Marquesas. 



Shell oblong-ovate, rather thin, narrowly perforate, longitu- 

 dinally finely and irregularly rudely striate, transversely im- 

 pressly striate, striae fine, close and wrinkled ; whorls 4 J, con- 

 vex ; spire short ; suture impressed ; aperture oblique, oblong 

 ovate ; lip callous, evenly and flatly reflected and expanded ; 

 columella slightly dilated above ; fawn color, obscurely striped 

 with dark brown, lip and aperture chocolate brown. 



Partula recta, Pse. Plate 12, fig. 8. 



Description. — T. conico-ovata, tenuiscula, anguste umbilicata, 

 transversim tenuiter et conferte undulato-striata; anfr. 5, piano- 



