182 GASTEROPODA OF THE INFERIOR OOLITE. 
Shell elongate, but slightly turrited ; spiral angle nearly regular. Whorls about 
twelve, flattish, sutures wide but varying. Each whorl is ornamented by three 
strong nodular spirals, of which the two posterior are somewhat removed from the 
third, the centre one being usually the weakest, an indistinct fourth spiral line may 
sometimes be noticed. The longitudinals are prominent, and extend throughout 
the shell in an almost continuous series with a twist from left to right. 
Base depressed and marked with three spiral lines. Aperture confined, and 
suborbicular, with a considerable callous deposit on the columella, which is extremely 
short. Other indications wanting. 
felations and Distribution—The above description is sufficiently near to the 
original diagnosis of Deslongchamps to leave little doubt that this is at least a 
variety of C. scobina. It occurs very rarely in the Inferior-Oolite Sands, the figured 
specimen being described by the late Mr. Witchell as from ‘‘ the base of the Sands, 
Nailsworth.” Tate, on the authority of Lycett, speaks of C. scobina from the 
“‘Upper-Lias Sands, Upper zone, Nailsworth.” It is related to Cryptaulaz tortilis, 
H. and D., which may be regarded as the generalised representative of the group 
on several horizons. Cryptaulax scobina also occurs towards the base of the 
Yeovil Sands at East Cliff, near Bridport Harbour. 
112. Crypravnax tortinis, Hébert and Deslongchamps, 1860. Plate XT, figs. 12 a—e. 
1860. CrrirHium tortie, H. and D. Foss. Montreuil-Bellay, p. 39, pl. vi, 
figs. 1, a—e. 
1884. Cf. also Exentssa rorrinis, H. and D. Cossmann, Etage Bathonien, 
p. 123, pl. xiv, fig. 46. 
Non CrEriruium TortiLE, Eudes Deslongchamps. Mém. Soc. Linn. Norm., yol. vii, 
p- 200, pl. xi, fig. 15. 
Bibliography, §c.—The authors observe that this species might almost be 
ranked with the Turritellas. They make the diagnosis very comprehensive so as to 
include a number of varieties. It is thus that Cryptaulaz tortilis comes to have a 
wide range both in time and space. Originally described from the Callovian of 
Montreuil-Bellay, where it attains a length of about 14 or 15 mm., a variety of it 
about 10 mm. in length, with only three spirals, occurs at Hutka'in Poland, on 
what is stated to be the same horizon. The subjoined description refers more 
especially to varieties occurring in the Inferior Oolite of England. 
Description : 
Length : - : : . AS, mim. 
Width , : é : . 43 mn. 
Spiral angle ‘ : : . 15°—17°. 
1 Specimens from this locality are in the Museum of the Geological Society of London. 
