1^2 PROCEEDINGS OF THE ACADEMY OF (April, 



be counted on the penult whorl. The whole base is closely, finely 

 striate spirally. Aperture is long-ovate, acute above, the columella 

 with a small but distinct fold. 



Length 2.6, diam. 0.6 mm.; 5| post-nuclear whorls. 



Type No. 3033, A. N. S. P. 



This species has a spirally striate base, as in the subgenus Besla 

 of Dall & Bartsch, but it has not the special sculpture above the 

 'periphery described for the species of that group. 



Odostomia (Odostomidea) bartschiana u. sp. 



The shell is oblong, with a rounded nucleus more than half im- 

 mersed. Subsequent whorls have few strong ribs, about 13 on the 

 first post-nuclear whorl, not so many on the next, where they are 

 slightly protractive; eight vertical ribs on the last whorl. Intercostal 

 spaces very wide, concave, showing most minute spiral striae in 

 some places. Suture somewhat sinuated by the ribs. The ovate 

 aperture has a continuous peristome, the columella bearing a strong 

 central plait. 



Length 2, diam. 0.7 mm.; 4^ post-nuclear whorls. 



Type No. 3032, A. N. S. P 



The very small number of ribs with wide intervals appears to 

 indicate a section of subgenus distinct from Odostomella B. D. & D., 

 which may be called Odostomidea. 



Odostomia (Chrysallida) dulcis n- sp. 



Meneslho dathrata Gabb, Trans. Amer. Philos. Soc, XV, 1873, p. 226. Not 

 Odostomia dathrata Jeffreys, Ann. Mag. N. H. II, 1848, p. 345. 



The nucleus is more than half immersed. Subsequent whorls are 

 convex, with a deeply impressed suture. Sculpture of numerous 

 rounded vertical ribs equal to their intervals, gradually fading out 

 at the periphery of the last whorl. These ribs are crossed by six 

 slightly smaller spiral cords between sutures; the intersections are 

 not noticeably nodose. On the base there are seven cords, and there 

 they are broader and more crowded their intervals narrow. The 

 aperture is long-ovate. Columella concave and a little thickened 

 below, passing into a moderate fold above. 



Length 2.9, diam. 1, length of aperture 1 mm.; 5 post-nuclear 

 whorls. 



Melanella astuta n. n. 



Eulirna robusta Gabb, Trans. Am. Philos. Soc, XV, 1873, p. 227. Not of 

 A. Adams, 1861. 



The shell is very slightly curved, smooth and glossy, the whorls 

 nearly flat, rather short, showing a bluish-gray band above the 



