1917.] NATURAL SCIENCES OF PHILADELPHIA. 183 



middle; suture distinct, liut slightly oblique. Aperture short, 

 piriform, the columella strongly thickened. 



Length 4.2, diani. 1.2, length of aperture 1.1 nun.; 12 whorls. 



Type No. 3009, A. X. S. P. 



Melanella gabbiana n. sp. 



The shell is straight, smooth and glossy, of barely convex whorls, 

 the suture rather indistinct. There is an impressed protractive 

 groove on the penult whorl, left by a former peristome. Aperture 

 narrowly ovate. Outer lip sinuous, protractive. Columella strongly 

 thickened. 



Length 4.2, diam. 1.25, length of aperture 1.2 mm.; 11 whorls. 



Type No. 3012, A. N. S. P. 



Though of nearly the same dimensions as M. astuta, this species 

 differs in shape. 



Strombiformis sarissiformis n. n. 



Eulima acicularis Gabb, Trans. Amer. Philos. Soc, XV, 1873, p. 227. Not 

 of A. Adams, 1861. 



The shell is slender, the diameter contained about 5 times in the 

 length. Whorls of the spire nearly flat, smooth except for several 

 unequally spaced growth-arrest marks on each. Aperture very 

 narrow, lanceolate. Columella thickened. The tip of the spire 

 and the outer lip are broken. 



Length 12, diam. 2.2, length of aperture 3.3 mm.; 12 whorls. 



T\Te No. 3010, A. N. S. P. 

 Strombiformis praelubrica n. sp. 



Very slender, the diameter contained about 4| times in the length, 

 whorls hardly convex, very smooth, but showing faintly a few 

 marks of growth-arrest. Aperture narrow, lanceolate, acuminate 

 above Outer lip receding slightly downward. Columella rather 

 strongly thickened. 



Length 5.1, diam. 1.1, length of aperture 1.4 mm.; 11 whorls. 



T\T)e No. 3011, A. N. S. P. 



Strombiformis ischnon n. sp. 



The shell is very similar to M. prcelubrica, but differs by its more 

 slender shape, the diameter contained five times in the length. 

 The aperture is narrower, and the columella more thickened. 



Length 4.1, diam. 0.8, length of aperture 1.1 mm.; 10 whorls. 



Type No. 3013, A. N. S. P. 



Strombiformis (Subularia) stimulus n. sp. 

 The shell is minute, acuminate, showing very delicate, forwardly 



