326 



PROCEEDINGS OF THE ACADEMY OF 



[Dec, 



outlines distinctly concave; chamois colored with a wide, more grayish 

 border below the suture and an ill-defined cinnamon zone around the 

 middle of the last whorl, the base below it almost white. The 

 surface is glossy, with weak sculpture of spiral impressed lines and 

 slight, coarse axial striae. The summit is broken. Remaining 

 whorls of the spire nearly flat, the last long, weakly convex. The 

 suture is but slightly impressed, and descends rather al^ruptly but 

 shortly to the aperture. The aperture is very narrowly piriform. 

 The outer lip arches gently forward. The inner margin is convex, 

 covered with a spreading callous. Columella is narrow, deeply 

 concave, and very short. 



Length 7.7, diam. 2.3, lenglh of aperture 3.3 mm.; 7 whorls re- 

 maining, the summit broken. 



Fig. 27 .—Odostomia Fig. 28. — Odostomia Fig. 29.—Odostomia 

 prima. seciinda. terlia. 



Fig. 30.— 

 Odostomia 

 quarto. 



Odostomia (Nesiodostomia) quarta n. sp. Fig. 30. 



Waikiki beach, Oahu. Type No. 93927, A. N. S. P., coll. I)y F. 

 Stearns. 



The shell is cylindric-tapering, smooth, very glossy, cinnamon- 

 rufous. A wide subsutural margin is defined by a rather indistinct 

 line in the color. Outlines of the spire are barely convex, nearly 

 straight. The nuclear whorl is large, on edge, hemispherical; subse- 

 quent whorls are nearly flat, separated by a narrowly impressed 

 suture; the last whorl tapering below. The aperture is sub-piriform. 

 The inner margin is straight, rather heavily calloused. Columella 



