58 THE NAUTILUS. 



It differs from P. Integra Hald. in having a more elevated, slender 

 and acute spire, less deeply impressed sutures and much finer tex- 

 ture. The aperture is nearly ovate, not ear-shaped, the columella 

 gracefully curved and covered with a thin lamina. It differs from 

 P. anatina Lea in being much smaller, lighter colored, the whorls 

 less oblique, lines of growth more visible and being of lighter texture. 

 The shell as a whole, when seen with these species, impresses itself 

 as distinct at a glance. 



Physa cubensis Pfeiffer. 



This is a Cuban species found in Florida. I have not seen Pfeif- 

 fer's description, but forms kindly sent to me by Prof. Pilsbry may 

 be described as follows : 



Mature shell sub-fusiform, light amber, smooth and shining surface, 

 lines of growth scarcely perceptible, whorls five, convex, sutures im- 

 pressed, spire rising like a cone to an acute apex, aperture elongate 

 ovate, lip not expanded, columella twisted and covered with a callus. 

 Bi-annuan I think. 



A peculiarity of this species, as shown by the forms sent to me, is 

 that the immature form is ovate, the last whorl in the adult being 

 somewhat flattened and elongated, thus making the shell sub-fusiform 

 when mature. 



A NEW CALIFORNIAN BITTIUM. 



BY W. H. DALL AND PAUL BARTSCH. 



Bittium (Elachista) californicum >-pec. nov. 



Shell white, broadly elongate-conic ; whorls rounded, falling off 

 more abruptly toward the suture than the summit. The earlier 

 whorls increase less rapidly in diameter, and are more evenly 

 rounded. Base short, well rounded ; aperture suboval, effuse and 

 subchannelled anteriorly, with the posterior angle rounded ; colu- 

 mella somewhat twisted and slightly revolute. 



The ornamentation consists of about 14-16 broad and low axial 

 folds, which gradually become obsolete on the periphery and base, 



