ROSTELLARIA Parkinsoni 
TAB. CCCXLIX. — Figs. 1 to 5. 
Spec. Char. Turreted, costated, transversely 
striated ; last whorl tricarinated ; aperture 
expanded, with a one-angled entire lip ; su- 
perior canal short. 
Syn. Strombus Pes Pelicani. Jlroccki, II. 3 85. 
Rostellaria, having only one spur-like 
process Parkinson , VoL III. 03. 
R. Parkinsoni, Mantell Geol. Sussex , 
p. 7:2 and 108. 
A shell strongly resembling Strombus Pes Pelicani, 
but well distinguished by the shortness of the superior 
canal of the aperture ; and as Parkinson observes, by 
there being only one process from the wing-like lip ; in 
Pes Pelicani the upper canal has a process besides the 
three that proceed from the lip ; the stria?, costae, and 
general form are the same in both. 
The fossil Strombus Pes Pelicani of Brocchi is pre- 
sumed to be the same as the one before us ; but whether 
the green sand species mentioned by Parkinson, see his 
tab. 5, fig. 11, and by Mr. Mantell, be also the same, 
until we have more perfect specimens for comparison 
than have hitherto been met with, is very doubtful. 
The present species occurs in the London Clay, and 
in the sandstones beneath it, but above the Chalk. 
Fig. 1 exhibits the natural cast of the inside in a 
ferruginous sandstone, and the artificial cast of the outer 
surface from the opposite impression in the same stone, 
from Maidenhead, between Bray and Windsor ; given 
me by Mr. Walter ; it is accompanied by several other 
fossil shells known in the London Clay, in some of which 
the shelly matter still remains, especially of Dentalia. 
