50 
This shell approaches very closely to the Stphonaria gigas of Sow- 
erby ; we venture, however, after a close comparison between speci- 
mens of each in different stages of growth, to pronounce it a distinct 
species. It is of a more irregular form, and the separate impressions 
~ of the muscle and the siphon are remarkably distinct. 
Genus Parmopuorus. 
Parmornorus corrucatus. Parm. testd elongato-quadratd, tenvi, 
depressd, extis leviter corrugatd ; vertice obtuso, prope ad partem 
posticam inclinato. Reeve, Conch. Syst., vol. ii. pl. 189. fig. I> 
Hab. ad insulam Madagascar. 
Long. 14; lat. 2 poll. 
Principally distinguished by the position of the vertex, which is 
more posterior than in any other species; the wrinkled sculpturing 
upon the outer surface is also a well-defined peculiarity. 
PARMOPHORUS INTERMEDIUS. Parm. testd ovatd, elevatiusculd, 
antice attenuatd ; extis radiis asperrimis, quasi serratis, ornatd ; 
vertice prominulo, incurvo; margine crenulato. Reeve, Conch. 
Syst., vol. ii. pl. 139. fig. 5 and 6. 
Hab. ad insulam Bohol, Philippinarum. 
Long. 2; lat. 3 poll. 
This beautiful little shell, which may be considered as intermediate 
in its generic characters between the Parmophori and the Emargi- 
nule, is most elegantly radiated on the outer surface, and the only 
species of this genus at present known that is serrated at the margin. 
Genus EMARGINULA. 
Emarcinuna conoipea. Enmarg. testd conoided, albicante, extis 
striis numerosis creberrimé radiatd ; vertice centrali, acuto ; mar- 
gine valde crenato, sinu marginali profunde inciso. Reeve, 
Conch. Syst., vol. ii. pl. 140. fig. 7. 
Hab. ? 
Long. 4; lat. 3; alt. $ poll. 
A very characteristic shell, in the collection of William Walton, 
Esq. 
Genus CALYPTRAA. 
CALYPTREA CINEREA. Cal. testd suborbiculari, extis a vertice ra- 
diatd, radiis spinis parvis numerosis irregulariter ornatis ; intds 
cinereo nitente, cyatho magno, albo, subpellucido, lateraliter flex- 
uoso. Reeve, Conch. Syst., vol. ii. pl. 144. fig. 4. 
Hab. Cape Horn. 
Diam. 12; alt. 1 poll. 
An immense number of these shells, just brought to England, were 
found attached to a single log of wood floating off Cape Horn. The 
interior is lined with a very dark, ashy, highly polished enamel, but 
the cup is of a pure transparent white, offering a remarkably rich 
contrast of colour. The exterior of the shell is irregularly covered 
with numerous small spines, becoming, as in most of the Calyptree, 
obsolete with age. 
