105 
_ ‘This species is found at Barton Cliff; it differs a little 
from Brander’s excellent figure in the characteristic space 
on the upper part of each whorl, arid the less acuminated 
beak, but it can only be a variety. I have seen part of 
a cast in micaceous sand, from the Devizes Canal, very 
like this, but it had not the collar, if L may so term it. 
PLEUROTOMA acuminata. 
TAB. CXLVI.—Fig. 4. 
Spec. Cuar. Turreted, acuminated, longitudinally 
ribbed, transversely striated; whorls above, 
concave, edge fimbriated; below  sulcato- 
striated; aperture elongated, canaliculated, 
one third the length of the shell ; beak broad. 
Tus coste are numerous, pretty close anda little waved; 
the edges of the whorls are elegantly marked by the lines 
of growth so as to appear fringed ; volutions about nine ; 
width equal to about one-fifth of the length. — 
The narrowness of this shell and difference in other 
respects, from Brander’s Murex macilentus, or any other 
of his shells, seems to confirm it as belonging, exclu- 
sively, to some other place ; it was found at Highgate. 
{tis a curious fact that different places, frequently im 
the same country and of a similar formation, should have 
such specific distinctions. 
PLEUROTOMA comma. 
TAB. CXLVL—Fig. 5. 
Spec. Cuar. Turreted, beaked, with acute transa 
verse rising lines; volutions smooth in the 
middle, with many short curved coste ; aper- 
ture ovate, canaliculated ; beak slightly curved. 
Tue coste extend only over the smooth part of the 
whorl, they are swelled at the upper part, curved and 
pointed below, something like a comma; the rising lines 
are few, sharp, even and most prominent near the mid- 
dle of each turn: aperture about two-fifths the length of 
the shell. 
Stubbington has afforded this shell to Mr. Holloway, 
and I figure it at present as rare, not knowing that it has 
been found elsewhere. 
