186 INVERTEBRATA OF MASSACHUSETTS. 



much higher than broad, of about an equal width above and 

 below ; lip simple ; base convex, umbilical region indented, but 

 closed. Diameter about one tenth of an inch, height some- 

 what less. 



Found abundantly about the margin of Fresh Pond, under 

 fragments of wood, in company with Succlnea ovalis^ Pupa mo- 

 desta, &c., and also in moist beds of leaves in forests. It has 

 been found in Vermont, and Mr. Say originally found it in Georgia, 

 so that it is a widely spread species. 



This is a very well marked shell, not liable to be confounded with 

 any other species except H. labyrinthica, which is of about the same 

 size and shape. But the coarsely wrinkled surface of the one, and the 

 polished, highly reflecting surface of the other, are distinctions which 

 strike the eye at once ; if any thing further is needed, the parallel 

 ridges within the mouth of H. lahijrinthica will put the question 

 beyond doubt. When viewed from above, its numerous, narrow, 

 accurately adjusted volutions render it a very beautiful object. 



Genus PUPA, Lam. 



Shell small, more or less cylindrical, and obtuse at tip ; aper- 

 ture irregular, for the most part semi-oval, and modified by teeth. 



Pupa contracta. 



Shell ovate-conical, ivhitisJi ; whorls five, convex ; aperture sub- 

 ovate, lip spreading ; throat armed with three teeth, and contracted, 

 by a large concave tooth on the transverse lip, into the form of a 

 horse-shoe. 



Figure 117. 



State Coll., No. 88. Soc. Cab., No. 2395. 



Pupa contracta, Say ; Journ. Acad. Kat. Sc, ii. 374. Gould ; Bost. Journ. JVat. 

 Hist., iii. 399, pi. 3, f. 22. 



Shell ovate-conical, of a waxen white-color ; whorls five, con- 

 vex, faintly marked b)^ lines of growth, separated by a well- 

 impressed suture, and gradually tapering to a somewhat pointed 

 apex. Aperture irregularly ovate, about half the width of the 



