93 
CIRRUS* 
Gen* Char. Univalve, spiral, conical, without a 
columella ; funnel-shaped beneath ; volutions 
united* 
JVIost 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 Euom 
phalus, the genus nearest united to this, the apex is but 
little elevated, 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 modem 
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* CXLL— Fig. l. 
Spec* Char* Conical, sharp, with an obscure Ca- 
rina near the upper part of each whorl ; aper- 
ture round* 
horls 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* 
