LIMNAA. 91 
5. LIMNAZA AMPLA, Mighels. 
Plate 16, figs. 6, 7, 8. 
Plate 16, fig. 9, L. Binneyi, Tryon. 
Plate 16, fig. 10, Z. Swmassi, Baird ? teste Binney. 
Hald., t. 14, figs. 4, 5. 
Shell large, much inflated, suboval, rather 
thin, composed of five convex whorls, promi- 
nently shouldered at the upper part; epidermis 
of an obscure olivaceous green color; lines of 
accretion véry fine and compact; transverse 
lines obscure; suture deep, and in one speci- 
men canaliculate; spire short, and pointed 
when present; aperture oblong, very wide at 
the posterior part, but narrowing rapidly ante- 
riorly and occupying rather more than two- 
thirds the length of the shell; labrum thin 
and somewhat reflected; labium broadly re- 
flected, forming and partially covering an open 
and very deep umbilicus; columella fold very 
prominent. 
Length 33, diam. 25 mill. 
(65) 
