34 MOLLUSCA FROM THE GREAT OOLITE. 
cum aliis minoribus alternatis, suturis carinatis, carinis elatis et levigatis, bast planulatd, 
canali brevissimo; apertura subquadrata. 
Shell turreted, conical, excavated ; whorls (10) concave, narrow, with numerous trans- 
verse very fine lines, alternating with others still more faintly impressed ; the sutures are 
carinated, the carinz elevated and smooth, the base flattened, the canal short. Aperture 
subquadrate. 
The general aspect of our species approaches near to the Cerithium Defrancit of 
M. Deslongchamps, whose figure however is less conical, and the concavity of the whorls 
is much less. These differences, however, are only such as may pertain to varieties of the 
same species. It is rare; and the few examples which have occurred to us are composed 
entirely of crystalline carbonate of lime, which does not allow of the mternal characters 
being fully determined ; as far as we can observe them, the outer lip is simple, and the 
columella plicated with one fold, and the upper portion of the volution has a very slight 
fold. This shell belongs to the subgenus Zrochalia, Sharpe; but to the species having the 
columella solid and not hollow. 
Locality, The upper portion of the shelly beds near to Minchinhampton and 
Chalford. 
NERIN#ZA DUFRENOYI, Arch. sp. Plate VII, fig. 8, 8a—8e. 
Ceritaium Durrenoyt, Archiac. 1843. Mem. Soc. Géol. Fr., vol. v, pl. 31, figs. 3, 4. 
— — D’Orb. 1850. Prod. Paléont., p. 303. 
N. Testé parva, cylindrico-subulata ; anfractibus latis, planatis, costulis cinctis, et nodu- 
latis; cingulis 4 aut 5, inequalibus dense-nodulatis, cingula infra suturam valde elatd, et 
levigatd, sine nodulis. Anfractibus lineis perpendicularibus, interstitialibus dense et 
tenuissime instructis. Aperturd elongata, columelld solidd, plicis duabus? parvis; plica 
eaternd unica, magna. 
Shell small, cylindrical, or subulate ; the whorls wide, flattened, encircled with cost, 
which are nodulated ; the encircling bands are 4 or 5, unequal and closely, but sometimes 
imperfectly, nodulated ; the band nearest to the upper suture the largest and most elevated, 
it is nearly smooth, and without nodules. The surface of the volutions has also very 
closely-arranged fine perpendicular lines visible upon the imterstices of the cinctures. The 
aperture is elongated and narrow ; the columella solid, with two small folds; the outer lip 
has a single, much larger fold. 
The perpendicular length of the whorls is nearly equal to their transverse diameter ; the 
sutures are strongly marked. The usual length of this species does not exceed an inch, 
the number of volutions in large specimens not exceeding ten. ‘The coarseness of the 
Great Oolite rock is not favorable to the preservation of the more delicate features of this 
pretty and fragile species, so that in the greater number of instances the surface of the 
