Mr. Say found it in upper Missouri. It is very abundant in 

 Ohio, but I have not heard of any specimens found on this 

 side of the Alleghanies. 



He notices, that sometimes one and sometimes the two 

 smallest teeth are wanting. Indeed I have found only one 

 specimen in which the little basal tooth is present ; while 

 there is very frequently an additional tooth on the outer lip, 

 posterior to the others. If we except P. placida, a somewhat 

 doubtful species, it is the largest Pupa of the United States, 

 and is not likely to be confounded with any other. 



PUPA PROCERA. 

 Plate III. fig. 12. 



P. testa cylindracea, elongata, apice obtusa ; anfractibus sex, convexis, obliqud 

 striatis ; apertura semi-ovali, dentibus sex armata, quorum posterior emarginatus. 



Shell elongated, ovate-cylindrical, obtuse at apex, of a 

 brownish horn-color ; whorls six, convex, the three anterior 

 ones of nearly equal diameter, and the three posterior ones 

 forming a very obtuse apex ; suture deep ; aperture semi- 

 oval, rather longer than broad ; lip brown, somewhat incum- 

 bent at the middle of the right side, unequally reflected, not 

 flattened, and curving at an abrupt angle before it joins the 

 preceding whorl ; throat armed with five teeth ; one on the 

 middle of the transverse lip is compressed, stretching towards 

 the junction of the outer lip, and emarginate at the middle, 

 sometimes even bicuspid ; a conical one on the pillar a little 

 below its junction with the transverse lip, and sometimes 

 there is a small denticle at the base of this ; a smaller one at 

 the anterior termination of the pillar; a small one, often 

 wanting or inconspicuous without a large magnifier, about the 

 middle of the outer lip ; and the fifth, broad and considerably 

 elevated, seen at the very depth of the cavity of the aperture 

 as we look down into it, opposite to the tooth of the trans- 

 verse lip ; umbilicus small and open. 



Length ^ of an inch ; breadth 5 X 5 of an inch. 



This very distinct species was sent to me by Professor E. 



