72 PEOCEEDINGS OF THE NATIONAL MUSEUM vol.70 



having the aspect of being overglazed; sculpture only of nearly 

 imperceptible incremental lines; base somewhat prolonged, rounded; 

 aperture ovat«, outer Up thin, produced medially, evenly rounded 

 into a short slightly concave inner lip. Length of shell, 3.2; of aper- 

 ture, 0.7; diameter, 1 mm. U. S. Nat. Mus. Cat. No. 108037. 

 Off Fernandina, numerous. 



Genus MUCRONALIA A. Adams 



MUCRONALIA MAMMILLATA, new species 



Shell spindle-shaped, thin, translucent white, with a minute subcy- 

 lindrical initial whorl and about three subsequent, moderately convex, 

 smooth, polished whorls, the last of which is much the largest; suture 

 closely appressed; base attenuated; aperture narrow, sublunate, the 

 margins thin, simple, outer Up nearly straight, slightly retractive 

 anteriorly. Length of shell, 4; of aperture, 1.5; diameter, 1.5 mm. 

 U. S. Nat. Mus. Cat. No. 108040. 



Off Fernandina, one specimen. 



This has somewhat the form of an Olivella. 



MUCRONALIA SUAVA, new species 



Shell small, spindle-shaped, slender, translucent white, with a brown- 

 ish styliform nucleus of two and about four and a half slightly con- 

 vex subsequent whorls; suture closely appressed, distinct; sculpture 

 of fairly evident incremental lines; last whorl more than half as long 

 as the shell; base attenuated, imperforate; aperture narrow, margins 

 thin, simple, outer lip nearly straight, anteriorly receding; inner lips 

 slightly raised. Length of shell, 5.5; of aperture, 1.8; diameter, 1.9 

 mm. U. S. Nat. Mus. Cat. No. 108392. 



Off Georgia, three specimens. 



This is of the same general type as M. mammillata but is larger, 

 and the transition from the mucro to the normal whorls is less abrupt. 



MUCRONALIA ? BUUMULOIDES, new species 



Shell much the shape of a slender Bulimulus or Lymnaea, white, 

 translucent, with seven moderately convex whorls, including two 

 slightly brownish nuclear whorls; suture distinct, not deep; surface 

 brilliantly polished, with faint incremental lines; a faint varical groove 

 on each whorl; last whorl more than half as long as the shell (3.7 mm.) ; 

 base gently attenuated, imperforate; aperture elongate-oval, outer lip 

 thin, moderately convexly arcuate; inner lip thin, nearly straight, 

 slightly raised, no callus on it or on the body. Length, 6; diameter, 

 2.5 mm. U. S. Nat. Mus. Cat. No. 108382. 



Off Georgia, five specimens. 



There is some doubt as to the proper place of this shell, as the 

 nuclear whorls are abruptly separated from the others, but otherwise 



