CRYPTAULAX. 185 
115. Crypravnax contorta, Deslongchamps, 1842. Plate XI, figs. 15 a, 15d, 15. 
1842. Crrirnium contortum, Desi. Mém. Soc. Linn. Norm., vol. vii, p. 194, 
pl. x, fig. 44. 
Bibliography, §c.—A fossil of the ‘* Oolite ferrugineuse ” of Les Moutiers and 
Bayeux, where it is by no means rare. 
Description : 
Length of a fair-sized specimen ; . 40 mm. 
Width : : ; . (mm, 
Length of body-whorl to entire shell «2a LOO: 
Spiralangle . : : pee lilies 
Shell subulate, turrited, apex very sharp; spiral angle regular. Whorls 
numerous, pentagonal, subconcave, and separated by a broad sutural sulcus. The 
ornaments consist of two stout spiral bands at each extremity, enclosing one or 
two which are less prominent; between these bands are fine spiral lines or striz. 
There are five prominent longitudinal costz twisted from left to right, and pro- 
ducing at the points of intersection blunt tubercles drawn out spirally. In the 
posterior whorls the cost are for the most part in sequence, but anteriorly this 
line becomes irregular and dislocated. 
Body-whorl relatively short, base very flat, and spirally striated. Aperture 
suboblong, columella short; inner lip circular, outer lip angular, especially at the 
junction with the body-whorl, where indications of the furrow may be noticed. 
Whorls in section ovate-oblong. 
Relations and Distribution—The strongly pentagonal outline of the spire, 
besides minor differences of ornamentation, serve to distinguish Cryptaulax 
contorta from the species last described. Both of them belong to what I may term 
the Turritelloid section of Cryptaulax. They also more especially answer to 
Cossmann’s genus “ Pseudocerithium,” which is represented in the Bathonian of 
France by Pseudocerithiwm densistriatum, Cossmann. Both sections of Cryptaulax 
are unrepresented in the Great Oolite of this country. On the whole, it would 
seem that Cryptaulaa contorta and its allies might just as well be placed under the 
Turritellide as under the Cerithiide. 
Oryptaulax contorta, in this country, seems confined to the Parkinsoni-zone, 
or to the very highest beds of the Humphriesianus-zone, such as the Cadomensis- 
bed at Oborne. It is especially abundant in P, at Burton Bradstock, Vitney Cross, 
&e., and occurs on the same horizon at Stoford and at Grove, all in No. 1 district, 
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