OF CONCHOLOGY. 229 



Shell depressly conoidal, somewhat globose, solid, concen- 

 centrically striate, striae distant, very fine, and furnished with 

 short hairs ; spire obtuse ; whorls 4, flatly convex, the last cari- 

 nate at the periphery, and margined beneath by a slight groove, 

 base Convex ; columella simple, spreading out in a thin light- 

 colored callosity ; peristome simple, very slightly recurved, and 

 its edge somewhat callous, especially at its base ; aperture widely 

 semilunar, subtriangular. Bright or pale straw color. 



Remarks. — The above species is apparently allied to H. 

 JCi'isteriana, Pfr., collected by Mr. Cuming at Tahiti. Several 

 species of this type inhabit Polynesia, which we ■^ill review 

 bereafter. The short hairs on this species follow the s trite, and 

 easily rub off, when the striae become very indistinct. 



Helicina zigzag. Pease. — Plate 15, fig. 20. 



Description. — T. trochiformis, solidiuscula, tcnuiter oblique 

 striata ; spira depresse conoidalis ; flavida, flammis aut lineis 

 rufescentis, undulatis ornata; anfr. 4, convexiusculi, ultimus ad 

 peripheriam costato-carinatus, basi convexus ; columella ver- 

 ticalis, brevis, basi angulata, callum tenuem flavidum, sublonte 

 granulatum, emittens ; perist vix reflexiusculum ; apertura late 

 semilunaris ; operc. semilunaris, tenuisculum, rubellum. 



Dimensions. — Diara. 6|, alt. 4 mill. 



Habitat. — In Insula Oualan. 



Shell trochiform, rather solid, finely striated obliquely ; spire 

 depressly conoidal ; yellowish, ornamented with oblique, undu- 

 lating, reddish flammules or lines ; whorls 4, slightly convex, the 

 last rib carinate at its peripher^^, base convex; columella short, 

 vertical, angulated at its junction with outer lip ; basal callosity 

 thin, yellowish, very minutely granulated ; peristome slightly 

 reflexed ; aperture widely semilunar; operculum semilunar, 

 rather thin, reddish. 



Taheitea pallida. Pease. 



Description. — T. non rimata, cylindracea, scalariformis, decol- 

 lata, tenuiscula, laevigata, nitida, subtranslucida, albida ; anfr. 

 4, rotundato-convexis, ad suturum vix rotundato-angulatis ; 

 sutura bene impressa ; costis prominentis, rectis numero apud 

 20 ; apertura verticalis, ovalis, vix porrecta ; perist continuum, 

 margine dextro leviter expansum tenuisculum latere columellari 

 incrassatum. 



Dimensions. — Diam. 6|, alt., 2|- mill. 



Habitat. — Ins. Tahiti et Huaheine. 



Shell imperforate, cylindrical, scalariform, decollate, rather 



