8 SUPPLEMENT TO GREAT OOLITE MOLLUSCA. 
Geological Position and Locality. The Great Oolite of Kirklington, Oxon, collected 
by J. F. Whiteaves, Esq. Eparcy, France. 
CERITHIUM? STRANGULATUM, Archiac. Tab. XLIV, fig. 2. 
A shorter and less cylindrical variety of this species was figured in the first part of the 
‘Great Oolite? Monograph, plate ix, fig. 18. ‘The present specimen, which agrees more 
nearly with the example figured by D’Archiac, has seven longitudinal coste, which are 
conspicuous ever to the base ; the contracted, pupzform aperture, with its prominent lips, is 
alike in both varieties. 
Cerithium strangulatum, C. Bulimoides, C. spiculum, and C. exigua, belong to a small 
group of minute, subcylindrical shells, with prominent, longitudinal cost, and small, 
thickened, orbicular apertures, which have been referred to Cerithium and to Rissoa ; 
perhaps eventually it may be deemed proper to separate them under a new generic 
appellation. 
Geological Position and Locality. The Great Oolite of Minchinhampton Common ; 
rare. 
CrerrrHium uNDULATUM (var.), Des/., sp. Tab. XLIV, fig. 6. 
MELANIA UNDULATA, Deslongchamps. Mém. Soc. Linn. de Normand., 1842, vol. viii, 
pl. 11, fig. 58, var. a. 
Testa turrita; anfractibus planis, transversim striatis, ad suturas crenulatis, longitudi- 
naliter costatis, in ultimo anfractu costis subincurvis, basi obliqua, striata; apertura 
elliptica, obliqua, columella marginata ; labro sinistro fissuram umbilicatem obtigente. 
Var. a, testa breviori, costis et striis crassioribus, rariorisque. (Deslongchamps.) 
Shell minute, turreted; volutions flattened, transversely striated, crenulated near to 
the sutures, and longitudinally costated; aperture elliptical, oblique. 
Our example constitutes a small and short variety, with narrow volutions (about 8) ; the 
coste are large, straight, and from 7 to 8 in a volution; they are most conspicuous near 
to their upper extremities, which project, forming a kind of coronary border immediately 
beneath the suture. Another minute specimen, apparently belonging to the same variety, 
has the first three volutions almost plain, and the costa upon the succeeding volutions are 
but little prominent. 
The typical form of the species figured by M. Deslongchamps has the coste much 
more numerous and less prominent. 
Geological Position and Locality. The Great Oolite of Minchinhampton, collected by 
E. Witchell, Esq. 
