93 
CIRRUS. 
Gen. Cuar. Univalve, spiral, conical, without a 
columella ; funnel-shaped beneath ; volutions 
united. 
— ee 
Moszr of the shells of this genus have round mouths, 
not indented by the last whorl, but united to it by an 
expansion and thickening of the substance of the shell. 
The apex is always elevated much above the base, and 
equally so at all ages of the shell; whereas, in Kuom- 
phalus, the genus nearest united to this, the apex is but 
jittle eleyated, except sometimes in old shells, when the 
last whorl descends more than usual; from Scalaria it 
differs in the union of the whorls, and the want of ribs. 
A shell of this genus is distinguished at once by the 
peculiar aspect of the funnel-shaped umbilicus which 
exposes the inner parts of the whorls. It is a curious 
genus, and would be considered a Turbo till modern 
discernment showed the necessity of nicer distinctions : 
having no columella it represents the whorl of some 
tendrils called Cirri, or a curled lock of hair, I have 
_ therefore named it Cirrus. 
CIRRUS acutus. 
TAB. CXLI.---Fig. 1. 
Spec. Cuar. Conical, sharp, with an obscure ca- 
* ‘ina near the upper part of each whorl ; aper- 
ture round. 
= — 
W norts about eight ; the height and the diameter of the 
base are equal: the volutions are united by only a small 
part of their surface, as is the case with most of the 
genus: the lines of growth are longitudinal, fine and 
regular. 
This specimen was sent me long ago by Mr. Martin 
from Derbyshire ; it is extremely neat; there are crystals 
of Carbonate of Lime within it. 
