20 SUPPLEMENT TO GREAT OOLITE MOLLUSCA. 



figure, by the greater number of carinse, and by the absence of tubercles upon them. 

 Turbo castor, D'Orbigny, resembles it in the characters of the carinae, 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, Lye. Tab. XXXI, fig. 6. 



Testa conica spira elata, apice acuta, anfractibus (5) convexis, subanffulatis, costis 

 tuberculosis cingendis ; costis duobus superioribus minoribits, inferioribus majoribus ; anfractu 

 ultimo basi carinis serratis (5) cingendis ; umbilico nullo. 



Shell conical ; spire elevated, pointed ; volutions (5) convex, somewhat angulated, with 

 four encircling costse or carinse, which are densely and delicately tuberculated, and 

 decussated by fine striations, the two lower costa3 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 costae ; there is no umbilicus. 



Height 10 lines, length of the last volution 8 lines. 



The encircling carinse occupy nearly the entire height of each volution, leaving only 

 narrow, deep, interstitial spaces ; the lowest of the carinae is the largest. The general 

 figure approaches to Turbo capitaneus, Goldf., but the latter has the encircling carina3 much 

 more elevated, narrow, more widely separated, and less numerous. Turbo Phillipsi, Mor. 

 and Lye., 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, Lye. Tab. XXXI, fig. 15. 



Testa oblique ovata, l&vigata, spira parva, depressa, sub-celata, anfractu ultimo per 

 inflato ; qpertura ampla, labro inferno convexo. 



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 Neritina Staffcnsis, 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. 



