199 
DESCRIPTION OF TWO NEW SPECIES OF GASTROPODA FROM THE UPPER 
LIAS OF YORKSHIRE. BY REV. JOHN HAWELL, M.A. 
(Read 29th October, 1896.) 
Plate XXXV. 
During the visit of the Yorkshire Geological and Polytechnic 
Society to Whitby, early in August last, two species of Gastropod 
Shells were found in the Upper Lias, both of which appear to be not 
only new to the Yorkshire Lias, but, so far as I have been able to 
ascertain, new to science. Both of these were found in the Jet Rock, 
or zone of Ammonites serpent hiiis, at Salt wick Nab, near Whitby. 
The interest of these discoveries will be appreciated when the follow- 
ing facts are borne in mind : first, that the Pahuontology of the Upper 
Lias of Yorkshire, and especially of the Whitby neighbourhood, has 
been very exhaustively worked out, especially as regards conchology, 
and that very little has been added since the publication of Messrs. 
Tate and Blake's admirable work on the "Yorkshire Lias"; secondly, 
that these authors are only able to record two species of Gastropoda 
as having been found in the zone of Ammonites serpentinus in York- 
shire, namely Natica buccinoides, and Euomphalus minutus, although 
special facilities have been afforded by the mining of jet. It is also a 
very notable circumstance that both of these species were discovered 
by a lady — Mrs. Kendall. 
ACT^ONINA KENDALLII, SP. NOV. 
The first discovered of the shells referred to is a species of 
Actwojiina, of which the following is a diagnosis : — 
Shell thin, ovate, whorls three, shoulder of whorls almost a right 
angle ; space between suture and shoulder convex ; spire short ; about 
15 well-defined impressed spiral striae on tfie last whorl, at pretty 
regular distances apart ; the space near the suture is, however, free 
from these striations, the uppermost of them coming just below the 
shoulder ; fainter intermediate impressed strice, varying in number 
from none to three, and irregular in their position and degree of 
definiteness ; growth lines fairly well pronounced ; commencing from 
