CRYPTAULAX. 183 
Shell elongate, turrited, apex sharp; spiral angle regular; sutural sulcus 
wide. Whorls eight to ten, short, subpolygonal; apical whorls more turrited in 
some specimens than the anterior ones. The ornaments consist of from three to 
four spinous or tuberculated spiral belts, of which the two outer ones are always 
the strongest. The coste are from ten to twelve in number, and only moderately 
twisted, in some varieties scarcely at all; usually the coste are not very pro- 
minent. 
Body-whorl about one-fourth of the total height of the shell, in some specimens 
slightly constricted anteriorly; base depressed and spirally striated. Aperture 
suborbicular, columella short and strongly encrusted. In some specimens there 
are indications of the groove at the posterior angle. 
Varieties—Fig. 12 a represents a specimen, from the Parkinsoni-zone of Aston, 
with four closely set spirals, and coste nearly straight and numerous. Fig.12bisa 
specimen from the same horizon and locality with three spirals. This might be 
almost called “ triarmatum.” Fig. 12 ¢ is a specimen from the highest part of the 
Humphriesianus-zone at Oborne. ‘This is longer than usual, possesses four 
spirals; and the cost are not quite so close ; they are also more twisted. Fig. 11 
represents a form apparently intermediate between C. fortilis and C. scobina. 
Relations and Distribution.—lf we accept all the varieties above enumerated as 
belonging to one species then it is somewhat difficult to see why Crypt. scobina 
should not be included. The longitudinal coste in the latter species are less 
numerous, and the ornaments less close. 
As regards distribution, Oryptaulax tortilis in this country is principally 
confined to the higher zones of the Inferior Oolite. Besides the localities already 
mentioned it is met with in the Parkinsoni-zone at Grove. Aston and Notgrove 
are the points farthest north where any of its varieties have come under 
my notice. 
113. CryprauLax PAPILLosA, Deslongchamps, 1842. Plate XI, fig. 13. 
1842. Crrrruium PApPILLosuM, Des. Mém. Soc. Linn. Norm., vol. vii, p. 209, 
pl. xi, figs. 42—44, 
Bibliography, Sc.—Described from a single specimen of the “ Oolite ferru- 
gineuse,” Bayeux ; considerably smaller than the specimen described below. 
Description : 
Length , - : : .. 14mm. 
Width ‘ , ; : . + 8 mm, 
20°. 
Spiral angle . 
