LEPTACHATINA. 13 



translucent, faintly striate. Outlines of the spire are con- 

 vex below, straight near the obtuse, rounded apex. The 

 whorls are barely convex, the last ascending a little towards 

 the aperture, where the suture abruptly turns down. The 

 aperture is vertical, narrowly rounded but scarcely angular 

 at the foot of the columella. Outer lip obtuse, contracting 

 a little, columella vertical, reflected, passing into the parietal 

 callus, which is distinctly if but slightly thickened near the 

 edge, and forms an oblong, small tooth where it terminates 

 at the posterior commissure. The columellar lamella is 

 scarcely or not visible in a front view, but is moderately 

 strong and oblique in an oblique view in the aperture. Length 

 5.8, diam. 2.75, length of aperture 2.7 mm. ; 5^2 whorls. 



East Maui (Newcomb). Type and another in the New- 

 comb collection, Cornell University. 



This species differs from L. anceyana Cooke (a fossil of the 

 Mana deposits, Hawaii, Vol. XXI, p. 39) in very little besides 

 its smoother surface. The Hawaiian shell is rather strongly 

 striate, the striae becoming stronger and recurved near the 

 suture. The difference in sculpture between the two forms 

 is emphasized by the whiteness of the fossil, which gives the 

 striation full value to the eye. If found on the same island, 

 we would rank hyperodon as a variety of L. anceyana. 



Newcomb 's collection contains two species in the vial la- 

 beled A. grana (no. 29981 of his collection in Cornell Uni- 

 versity). Four shells are the form figured as grana in Vol. 

 XXI. Two belong to the species described above. 



L. ANCEYANA Cooke. Vol. XXI, p. 39. 



To the description of anceyana should be added: The 

 parietal callus is slightly thickened along its outer edge, and 

 enlarges into a small, somewhat triangular tubercle pos- 

 teriorly, separated from the termination of the outer lip by 

 a narrow channel. 



Section LABIELLA Pfr. 



L. LABIATA (Nc.). Vol. XXI, p. 77. Additional localities 

 are Mokuleia (Gulick), Popouwela (Pilsbry, Spalding and 



