GASTEROPODA. — 17 
Locahty. The planking of Minchinhampton Common and white stone of Bussage 
contain it; but at the latter place the more delicate features are usually best preserved.. It 
is rather rare. Inf. Oolite, Bayeux; Great Oolite, Ranville, Normandy. (Des/.) 
ALARIA LAVIGATA. Plate III, fig. 3, 3a. 
A. Testi fusiformi, anfractibus convewis, levigatis, ultimo bicarinato, carind superiort 
spinigera ; spino oblongo ort opposito; ald brevissimd in a@tate juniori monodactyld, dein 
(@tate adulta) magna didactyld, digitis longis divaricatis, tenuibus, trigonis; caudd longd, 
recta, apice sub-incurvo; apertura oblonga, labro sinistro subcalloso. 
Shell fusiform, whorls convex, smooth, the last whorl with two carine, the upper carina 
spined ; the spine oblong, and placed opposite to the aperture; the wing very small when 
young, at first it has but one digitation, with advance of growth it acquires two large digi- 
tations, which diverge in opposite directions, they are smooth and three-sided ; the caudal 
extremity is long and curved towards the apex; the aperture is oblong, the left lip bemg 
slightly thickened. 
In everything, excepting its smooth surface, this shell agrees with the Rostellaria 
myurus of Deslongchamps; but as we have seen about twelve specimens, which were well 
preserved, it is impossible that they ever could have had the striae which distinguish the 
shell from Normandy. 
Locality. Jt is rare, and has been found only in the planking of Minchinhampton 
Common and contemporaneous beds of white stone north of the Vale of Brimscombe. 
ALARIA HAMULUS, Des/. sp. Plate III, figs. 4, 4a, 44. 
ROsTELLARIA HAMULUS, Deslongchamps. Mem. Soc. Linn. Normandie, vol. vii, p. 175, 
pl. 9, figs. 37—40. 
— - Desh. Lam. An. sans Vert., 1843, tom. 9, p. 666. 
PrerocEera HAMULUS, D’Oré. Prod. Paléont., p. 302. 
A. Testa parva turritd, apice obtuso, anfractibus (5—6) carinatis nodulosis; ultimo anfractu 
subgibbo, transverse striato ; striis inequalibus, majoribus alternatim minoribusque ; carind 
nodulosd seu plicata; labro externo incrassato variculam simulante; ald parva unidigitato, 
apice acuto trigono, subtus canaliculato; caudd brevissimd, apertura subelliptica. 
Shell small, turrited, clavate, apex obtuse, whorls (5—6) convex, nodulated, nodules 
six in a volution. The last whorl has a single nodulated carina terminating anteriorly in a 
slight digitation. In the immature state the digitation is produced into a hook-shaped 
process. The surface has numerous encircling striae, somewhat irregular, but which are 
alternately large and small. The upper margin of each whorl has a prominent line closely 
tuberculated; the aperture is narrow, being contracted on the right side by a thickened 
