92 MOLLUSCA. 
tura parva, obliqua, lunata, anticé subeffusa, posticé lamellam volven- 
tem gerens ; plica columellart modica, bilamellata. 
Pupa (Megaspira) elata, Gouty; Proceed. Boston Soc. Nat. Hist., 
ii. 197. March 1847. Expedition Shells, 34. Bulimus (Pupa) ela- 
tior, var. y, Pretrrer; Monog. Helic. Viv. 11. 390. 
Suett sub-cylindrical, elongated, thin, shining, longitudinally 
barred with crowded striew, horn-coloured, and variegated near the 
suture with small dusky blotches. Spire obtuse at apex, composed 
of about nineteen narrow, nearly plane whorls. Aperture small, 
oblique, lunate, somewhat effuse at base, with a lamellar plate revolv- 
ing posteriorly; columellar fold moderately developed, bilamellate. 
Umbilicus minute. 
Length an inch and a half; breadth one-third of an inch. 
Inhabits Brazil. 
At first sight this shell would be taken for Megaspira elatior, Spix. 
On comparison it is found to be smaller, less tapering, having nineteen 
whorls instead of sixteen within the same space; its diameter is at 
least one-third less, its surface is more glossy, and more delicately 
barred, and it has only a few dot-like blotches near the suture, instead 
of stripes across the whorl. ‘The aperture is smaller, more oblique, 
and crescentic; the columellar fold is much smaller, and the lip is 
effuse in front of it, and it is made up of only two delicate plates 
instead of three conspicuous ones, as in P. e/atior. ‘The umbilicus is 
minute, while in the other it is quite large. 
Figure 101, a view of the aperture. Figure 102, aperture of P. 
elatior. 
VERTIGO TANTILLA (Gould). 
Testa minima, sub-ovalis, albida, perforata: spira obtusa; anfractibus 
quatuor convexiusculis, supernis sub-clathratis, ultimo exiliter rugoso- 
granulato: aperturu sub-rotunda, peristomate everso ; fauce dentibus 
quingue armata, quorum uno columellart, uno basali, uno labial et 
duobus posticis. 
