20 SUPPLEMENT TO GREAT OOLITE MOLLUSCA. 
figure, by the greater number of caring, and by the absence of tubercles upon them. 
Turbo castor, D’Orbigny, resembles it in the characters of the carinz, but they are less 
numerous and less elevated ; the spire is also much less produced. 
Height 15 lines, transverse diameter of the last volution 11 lines. 
Geological Position and Locality. The Great Oolite of Minchinhampton Common, in 
which it occurs rarely in the coarse volite or planking. 
AMBERLEYA ARMIGERA, Lyc. ‘Tab. XXXI, fig. 6. 
Testa conica spira elata, apice acuta, anfractibus (5) convexis, subangulatis, costis 
tuberculosis cingendis ; costis duobus superioribus minoribus, inferioribus majoribus ; anfractu 
ultimo bast carinis serratis (5) cingendis ; umbilico nullo. 
Shell conical ; spire elevated, pointed ; volutions (5) convex, somewhat angulated, with 
four encircling coste or carinee, which are densely and delicately tuberculated, and 
decussated by fine striations, the two lower cost being much larger than the upper, so 
that the lowest costa overhangs the upper part of the next volution; the base has five 
encircling, serrated coste ; there is no umbilicus. 
Height 10 lines, length of the last volution 8 lines. 
The encircling carinz occupy nearly the entire height of each volution, leaving only 
narrow, deep, interstitial spaces ; the lowest of the carinz is the largest. ‘The general 
figure approaches to Zwrbo capitaneus, Goldf., but the latter has the encircling carinze much 
more elevated, narrow, more widely separated, and less numerous. Zurbo Phillipsi, Mor. 
and Lyc., has a much shorter spire, with the volutions less ventricose or angulated ; other 
species are more remotely allied. 
Geological Position and Locality.—The Cornbrash of Scarborough, in which it is rare ; 
from the cabinet of John Leckenby, Esq. 
Nerita INvoLuTA, Lyc. Tab. XXXI, fig. 15. 
Testa oblique ovata, levigata, spira parva, depressa, sub-celata, anfractu ultimo per 
inflato ; apertura ampla, labro interno convezo. 
Shell oblique, ovate, smooth ; spire (apparently consisting of two volutions) small, 
depressed, nearly concealed by the envelopment of the last volution, which is much inflated 
at the aperture ; inner lip convex, smooth. 
A plain species, distinguished by the great length and volume of the last volution; the 
apex of the spire is imperfect, but though quite depressed, probably it is not altogether 
concealed ; the general figure is allied to Meritina Staffensis, Forbes, but the latter is 
more lengthened and more minute. 
Geological Position and Locality. Collected by Mr. Whiteaves in the Great Oolite of 
Kirklington, Oxon. 
