NATURAL SCIENCES OF PHILADELPHIA. 329 



while those below suddenly increase in size much more rapidly 

 than the others, particularly in the direction of the longer axis of 

 the shell, and form most of its bulk: these laro-er turns, in laro-e 

 adult examples, sometimes assuming together a subcylindrical 

 outline ; the last or body whorl comparativel3^ long"? subcylindrical 

 or more or less oval, and somewhat produced below; suture 

 moderately distinct, almost transverse between the smaller upper 

 turns, but becoming decidedly' more oblique below; aperture com- 

 paratively small and narrow, apparently' snbrhombic ; inner lip 

 much thickened all the way up ; columella twisted so as to form 

 a single prominent fold below the middle of the aperture. Surface 

 nearly smooth, or onl^- showing verj- obscure lines of growth. 

 (Outer lip unknown.) 



Length of one of the largest, most elongated specimens, 2.23 

 inches ; breadth, O.St inch ; length of aperture, about 1 inch. 



This fine species most nearlj- resembles M. Nevoherryioi Stevens, 

 but may be readily distinguished b}' its form, the slopes of the 

 upper part of its spire being distinctly concave, and the lower 

 part convex in outline, instead of being evenly' and moderately 

 convex all the way down. This peculiarity is caused by the sudden 

 enlargement of the middle and lower volutions, and the greater 

 obliquity of their spiral curve ; while, in M. Neiuherryi^ the volu- 

 tions increase in size regularly, and have the same uniform spiral 

 curve from the apex throughout the whole length of the spire. 

 Young examples of the form under consideration are proportion- 

 atel}^ shorter, the elongation being to a considerable extent pro- 

 duced by the obliquity and prolongation of the last two volutions. 

 These less elongated younger shells, however, will be distinguished 

 from M. Newherryi by the concave slopes of their spires, and the 

 greater proportional breadth of their body volutions. This is also 

 a larger and more robust species than M. Newherryi. 



As none of the specimens yet seen have the outer lip and 

 lower part of the aperture entire, the form of the aperture cannot 

 be made out; and there may even be room for some little doubt 

 whether or not it is, in perfect examples, narrowed and produced 

 into a canal below. If this is the case, the name of the species 

 should be Solenii^cus Klipparti, as it appears to present very 

 nearly the other characters of the type of that group. 



The specific name is given in honor of John H. Klippart, Esq., 

 .of Columbus, Ohio, Secretary' of the State Agricultural Society, 

 18t2.] 



