CHIEFLY OF THE UNITED STATES. 187 



umbilicus. In mature specimens the left of the aperture is nearly straight, and the 

 deposit is so enla%ed that it reminds one of the aperture presented in the NeritincB. 

 Under the microscope small, oblique, retrorse strise may be observed over the body 

 whorl. I name this after Mr. Currier, to whom I owe the possession of about a dozen 

 specimens. They were taken in Tennessee by Dr. De Camp, of the U. S. Army. 



