142 CONTRIBUTIONS 
one third the length of the shell; columella with two 
folds. 
Length 5-20ths, Breadth .1, of an inch. 
Observations. The strongly characterised longitudinal 
ribs of this species eminently distinguish it. At the base 
there are a few indistinct transverse striz, but the larger 
part of the whorl is entirely free from them. Among those 
here described, this is the only one with this character. 
C. parva. Plate 5. Fig. 141. 
Description. Shell somewhat elevated, turrited, with 
large longitudinal folds cut by large elevated transverse 
stri, spire elevated, obtuse at the apex; suture deeply 
impressed ; whorls five, convex ; umbilicus very small ; 
mouth semilunate ; columella furnished with two large 
folds ; outer lip sharp, within crenulate. 
Length .2, Breadth .1, of an inch. 
Observations. This truly beautiful little species is very 
distinct from either of the others here described. It may 
be at once known by its strong folds on the columella, 
and its large longitudinal folds and strong transverse striae. 
The genus Cancellaria has been observed in England 
only in the London Clay, from whence three species have 
been described.* |M. Deshayes’s Tables give forty-two 
* Min. Conch. pl. 360 and 361. 
