184 GASTEROPODA OF THE INFERIOR OOLITE. 
Shell subelongate, rugose; spiral angle nearly regular. Whorls about ten, 
short, and separated by a wide sutural sulcus. The ornaments consist of two 
very strong spiral bands, which are grossly nodular (papillz) at the intersection 
with the longitudinal coste. These latter are seven or eight in number, and but 
slightly interrupted ; the amount of inclination or twist is very slight. 
Body-whorl small; base depressed and marked with strong spiral lines. 
Aperture suborbicular, with a short and thickly encrusted columella; indications 
of the groove or furrow at the posterior angle. 
Relations and Distribution.—Distinguished by its very coarse tuberculation, 
and by having only two spiral bands. A single specimen from the Parkinsoni- 
zone of Grove. 
114. Crypraunax, ef. UNDULATA, Quenst., 1858. Plate XI, fig. 14. 
1858. CrrrruriuM uNDULATUM, Quenst. Der Jura, p. 488, t. 65, fig. 24. 
1860. TurRireLLa unpULATA, Quenst. Héb. and Desl., Foss. Mont.-Bellay, p. 49, 
pl. vii, figs. 18, a—e. 
Cf. also Certruium Hystrix, Desi. Meém. Soc. Linn. Norm., vol. vii, p. 195, pl. x, 
fig. 47. 
Bibliography, §¢.—T. undulata was very doubtfully described as a Turritella by 
Hébert and Deslongchamps, who remark that it has some resemblance to 
Cerithium hystriz, Desl. In the latter, they say, the whorls are more concave, 
the spiny tubercles of the anterior and posterior spiral belts (cordons) are more 
numerous, whilst the costa do not form a regular longitudinal series, but suffer 
interruption. 
Description.—Probable length 40 mm.; spiral angle about 12°. Whorls 
numerous, polygonal, widely separated by the sulcus of the suture. Hach whorl 
possesses a pair of prominent spiral bands or keels near the sutures; numerous 
fine spiral lines occupy the intermediate area. The costz are stout, wide apart, 
and extend nearly from suture to suture, but are irregular in sequence. They ar2 
about six in number. At the points where the costz decussate with the two 
spiral bands are very spiny tubercles, which give a rough aspect to the shell. 
Other indications wanting in English specimens. 
Relations and Distribution—The species to which I now draw attention is 
very rarely found in the Parkinsoni-zone of South Dorset, and hitherto only in 
fragments. It is probably intermediate between C. hystrix and C. undulata. ‘The 
former occurs somewhat rarely ix the Bajocian of Normandy, 
