70 
Fig. 2 is from a cast also in ferruginous sandstone, 
from the low Cliff under Reculvers Church, in Kent. 
Fig. 3 ; the shell remaining in the sandstone of 
Bognor Hocks. 
Fig. 4 ; two views of a Highgate specimen. And 
Fig. 5, a similar one from Folkstone. Specimens re- 
sembling those from Maidenhead are also found in 
Gunter’s-hill Sand-pits, near Emsworth, Hants, as I am 
informed by my good Friend Js. Holloway, Esq. 
ROSTELLAR1A calcarata. 
TAB. CCCXLIX. — Figs. 6 and 7. 
Spec. Char. Turreted, costated, transversely 
striated ; costae linear, curved ; last whorl 
carinated ; outer lip furnished with a large 
oblong process, the upper angle of which is 
formed into a long curved spine ; beak 
pointed ; superior canal obtuse. 
Parkinson , Vol. III. p . 63, tab. 5, f. 2. 
The last whorl of this elegant shell has several carinae 
besides the principal one, but they are very little ele- 
vated : the spire has no carinae, but is costated, and has 
some varicose sutures remaining upon it, which do not 
occur in the preceding species. The squarish wing-like 
process upon the outer lip is somewhat variable in form, 
its angles being more or less conspicuous : the spine 
from its upper angle is an elongation of the carina upon 
the whorl : the inner lip is entire, with a rounded edge. 
This shell was first noticed by Parkinson : it is by no 
means rare in the whetstone-pits of Blackdown. The 
largest individual I have seen belongs to Mr. De la 
Beebe ; it is given at fig. 6. The specimens are all sili- 
cious casts. 
