16 
the columella, forms the plait above alluded to, and acts 
at the same time as an internal support to the opercu- 
lum. From these remarks it appears, therefore, more fit, 
that the columella should be characterized as grooved, and 
not plaited. This formation is not, however, peculiar to 
this genus, but is likewise observable in all those species of 
Ampullaria and Natica, which have shelly opercula; while, in 
such as have this part horny, the character does not exist. 
_ 
PHASIANELLA INFLATA. 
(Lot 140.) 
P. testd ‘ventricosd, purpureo -fuscd, strigis angulatis ornatd ; 
spire brevissime anfractibus tribus modo manifestis. 
Shell ventricose, brownish purple with angular stripes, spire very 
short, of only three obvious whorls. ; 
APPROACHING very near, but sufficiently distinguished from 
the last. Exclusively of the minute terminal whorl at the tip, 
this species has only three, while P. ventricosa has four 
distinct spiral whorls. 
MITRA NIVOSA, 
(Lot 965*.) 
M. testd ovato-acutd, striis transversis, puncticulatis, excavatis, nebu- 
losd, punctis albis fuscisque sparsis varid, maculis imparibus, 
fuscis, bifasciatd ; labio crenulato. 
Shell ovate-acute, with transverse strie and excavated punctures, 
clouded, and variegated with scattered dots of white and brown, 
and two bands of transverse, unequal spots ;, outer lip crenated. 
Mitra versicolor. Martyn Conch, 1. tab. 23. 
A suELi peculiar to the coasts of New Holland and the 
Islands of the Pacific Ocean. The confusion that at present 
