94 MOLLUSCA. 
and at others very ample. There are from five to six moderately 
convex whorls. The aperture is rather small, from less than one-half 
to two-fifths the length of the shell, of a rounded ovate form: poste- 
riorly there is usually a single plate, which revolves within the shell. 
The lip is simple, and usually widely reflected over the pillar. Colu- 
mella rounded, and on some specimens a single transverse fold is 
observed ; and sometimes even two and three are discovered. 
Length about one-eighth of an inch; breadth about half the length. 
Found abundantly on pumpkin vines, at the Sandwich Islands. 
Hilo, Wilkes ; Oahu, Brackenridge. 
This interesting little shell is of somewhat doubtful genus. It may 
prove to be of the genus Tornatellina or Elasmatina. Its very 
variable characters render a decision difficult. But it belongs to 
the old genus Pupa, where I at present place it. 
Figure 104, front view of an elongated specimen, magnified ; 104 a, 
a short specimen, magnified ; 104, natural size; 104 c, d, e, enlarged 
views of the aperture. 
Heviciva uBERTA (Gould). 
Testa parva, solida, sub-globosa, levis, dilute citrina ; spira anfractibus 
quatuor ; sutura impressa: apertura parva, semilunaris, extrinsecus 
constricta; peristomate simplict, vix refiexo; columella callo flavo 
coptosissimo, haud appresso, induta. 
Helicina uberta, Goutp; Proceed. Boston Soc. Nat. Hist., ii. 202. 
March 1847. Expedition Shells, 37. Helictna constricta, PFEIFFER ; 
Proceed. Zool. Soc., July 1848, p. 120. 
A small, solid, smooth, nearly globular, pale greenish-yellow shell, 
very faintly marked by the lines of growth, having four whorls, the 
outer one large and well rounded at the periphery, with a fine but 
well-impressed suture; but chiefly remarkable for the quantity of 
bright yellow callus nearly covering the convex base of the shell in a 
tongue-shaped mass, not appressed to the shell. The aperture is 
