NATURAL SCIENCES OF PHILADELPHIA. 225 



appearing on the back of the body whorl ; suture deeply im- 

 pressed; aperture ovate, slightly oblique ; peristome rather sharp, 

 straight, somewhat thickened at the base; columella concave, 

 reflexed, with a stout plait, and together with the parietal regiou 

 callous. 



Length 8j mill. 



Hah. Viti Isles. (Coll. Garrett.) 



One example found perfect except loss of apex. The sulcations 

 do not quite extend to the sutural line, nor descend more than 

 half way down the length of the bod}' whorl. The whorls are 

 very short, and appear as if pressed into each other from above. 



Odostomia a^ianda, Garr., pi. 3, fig. 47. 



Shell small, elongate-oblong, rather thin, sub-pellucid, some- 

 what shining, cinereous ; spire long, gradually' tapering from the 

 body whorl, apex obtuse ; whorls 1, convex, longitudinally ribbed, 

 ribs small, smooth, rounded, constricted beneath the suture, form- 

 ing a row of granules ; interstices concave, the same width as the 

 ribs, and transversely impressl}' striated ; suture deeply impressed 

 and crenulate; aperture sub-ovate, acutely angular above, nearly 

 a fourth the length of shell ; peristome thin, straight ; columella 

 simple. 



Length 3 mill. 



Hah. Viti Isles. (Coll. Garrett.) 



One perfect example found on weedy ground in the middle 

 region of the littoral zone. It is well characterized by its delicate 

 sculpturing and the absence of the usual collumella fold. The 

 last character, though negative, will scared}^ remove it from the 

 genus, as the nuclear whorls are sinistral. It is closel}^ allied to 

 0. devse-coatafo, Nob., but is much smaller, more slender, the spire 

 longer, and the ribs more decidedly constricted beneath the 

 suture. 



Odostomia pulchra, Garr., pi. 3, fig. 48. 



Shell elongate, slender, thin, slightly shining, white; spire long, 

 turreted, regularh' tapering from the bodj' whorl, apex obtuse, 

 base slightly produced; whorls t, convex, shouldered above, lon- 

 gitudinally ribbed; ribs small, remote, angularly rounded, nar- 

 rower than their interstices, which latter are concave, minutel}'' 

 and closely ridged transversely; suture deeply impressed ; aper- 

 ture oblong oval, slightly oblique, nearly a fifth the length of the 



