ON A REVERSED SPECIES OF FUSUS. 
499 
the Murex adversus and Valuta Iieteroclita, of Montagu's 
" Testacea Britannica." The addition, therefore, of a third 
reversed species, cannot fail to interest the British concho- 
logist. The following description, with the accompanying 
magnified drawing, (Plate XV. fig. 2.), which exhibits a 
front and back view, will, we trust, sufficiently establish 
its characters. 
Shell with five rounded whorls, well defined at the line 
of junction. These increase somewhat rapidly in size, and, 
being a little depressed, give to the shell what is termed a 
bellied appearance. The mouth is oblong, placed obliquely, 
and interrupted by the convexity of the body-whorl. The 
outer lip joins the body-whorl at an acute angle. The pillar 
is straight, and slightly scooped out at the apex for the 
canal, which is shallow, regular, and short. 
The whole shell is smooth, glossy, and so transparent as 
to permit the pillar to be distinctly perceived throughout 
its whole length. The layers of growth are scarcely per- 
ceptible even when highly magnified. The whole shell 
scarcely exceeds a line in length. 
Three specimens of this shell have occurred to us in 
shell-sand from Noss Island, Zetland, which we collected 
after a storm in the spring of 1809. 
None of the characters of this shell would lead us to 
consider it as the young of any of the larger species. The 
relative proportion of the different whorls, and their num- 
ber, intimate that the shell is nearly at its full growth, or, 
at least, that it has assumed its true form. Had any doubts 
remained on this subject, we would not have offered the 
preceding description, as we are aware, that fry of several 
shells hold the rank of species in the systems of British 
conchologists. 
This shell belongs to the section of the genus Fusus 
distinguished by the absence of a pillar-cavity, and which 
