170 CONTRIBUTIONS 
are more separated from each other. In some specimens 
the ribs and transverse striz are so obsolete as to present 
an almost perfectly smooth shell. 'This species very close- 
ly resembles the figure of JW. pumila* (Sowerby.) It dif- 
fers in having a transverse furrow, and in the ribs being 
much stronger than the transverse strie. 
M. Flemingii.f Plate 6. Fig. 177. 
Description. Shell fusiform, transversely and very mi- 
nutely striate; substance of the shell thick; spire ele- 
vated, rounded at the apex; suture linear; whorls five, 
obtusely angular above; mouth contracted, nearly straight ; 
columella with four folds ; outer lip sharp. 
Length .8, Breadth .4, of an inch. 
Observation. This species approaches very closely in 
many of its characters to the genus Voluta. The regular 
folds, however, of the columella place it strictly among 
the Mitre. It is a much larger shell than the fusoides— 
has no ribs, and is more attenuate. 
MM. Humboldtii. Plate 6. Fig. 178. 
Description. Shell subfusiform, transversely and very 
closely striate, canaliculate above; substance of the shell 
rather thick; spire ——; suture linear; whorls ——, 
* Min. Conch. vol. 5, pl. 430. 
+ Named after the author of ‘‘ A History of British Animals,” &c. 
t In placing the name of the Baron Humboldt to this species, I use 
that which is among the most illustrious in geology. 
