DISTRIBUTION. | 
DISTRIBUTION. 
From Greenland to the Equator these mollusca roam every sea, 
and scarcely any attempt at deep-sea dredging has been carried 
on in the seas of Europe, Asia, Africa, or America without shells of 
this genus having been hauled up; they are most plentiful 
within the tropics, where the greatest number of varieties also 
exist. - One of the largest forms—viz., the Nassa fossata, Gould— 
occurs in California. The Mediterranean varieties are both 
curious and interesting, presenting such an extraordinary diversity 
of sculpturing that inexperienced conchologists have exercised 
their talents and ingenuity in describing shells as distinct that 
appeared to all reasonable men to be only varieties of common and 
well-known forms. 
OPERCULUM OF NASSA. 
Serrated. 
gemmulata, Lam. picta, D’k’r, mangelioides, Reeve. 
coronata, Brug. mucronata, A. Ad. delicata, A. Ad. 
Kieneri, Anton. Webbei, Petit. semigranosa, Dkr. 
mutabilis, Linn. varicifera, A. Ad. labecula, A. Ad. 
Sic ey , : 
luteostoma, Brod. and splendidula, D’k’r., or complanata, Powis. 
Sow. strongly crenated. ki Phil 
; : ivescens, Phil. 
reticulata, Linn. fraudulenta, Marr. ? 
: ; ; Gayi, Kien. 
pulla, Linn.? globosa, arcularia, Linn. Js 
(Juoy. triangular. 
gibbosula, L., and var. 
circumcincta, A. Ad. 
crebristriata, Carp. 
albescens, D’k’r. crenolirata, A. Ad. 
; bimaculosa, A. Ad. 
Gruneri, D’k’r., var. vas ; 
hispida, A. Ad. and var. immersa, 
fasciata, Lam. 
tiarula, Kien. 
Jacksoniana, Quoy. 
“4: Carp 
; . margaritifera, Reeve ; 
illarum, Phil. ? : ; 
- t - (not D’k’r.) picta, with a red brown 
thersites: some are ser- s 
rated, others crenated, Woodwardii of nue. 
and others again are Authors, Forbes (1), sesarma, Marr. 
lain. Quoy and G. ? ‘ 
an SPR Peril ” neritea, Linn. argentea, Marr. 
