CERITHIUM. 155 
a straight longitudinal system, thus producing straight granular cost, the nodes 
of which are drawn out axially. 
The body-whorl is ventricose and with similar ornamentation ; base full and 
ornamented with granular spiral lines. Aperture ovate with some traces of an 
anterior canal. Other indications wanting. 
Relations and Distribution —The generic position of this curious shell is open 
to doubt, but it seems to be fulfilling the dictum of Deslongchamps with regard to 
the ‘* Melaniz ” of the Inferior Oolite, viz. that they become shorter and stouter in 
the higher beds. The sudden increase in the body-whorl, however, carries it far 
beyond even Cerithium subabbreviatum, or the remarkable variety of CO. subscalari- 
forme from Grove (see fig. 10 a). . 
A single specimen from P,, Vitney Cross. 
73. CERITHIUM SUBGLABRUM, sp. nov. Plate VIII, fig. 138. 
Description.—Shell elongate, turrited; spiral angle nearly regular. Whorls 
about eighteen in number, short, slightly curved to nearly flat; sutures rather 
close. But little trace of spiral ornamentation beyond a faint line on each whorl 
at a short distance from the posterior margin. The longitudinals are well- 
developed in the apical and subapical regions, but with a tendency to become wide 
apart. These gradually fail in the last two whorls, though the terminal tubercles 
are retained. The lines of growth between the coste are visible. 
Body-whorl short, and with but little trace of ornament ; base spirally striated. 
Aperture ovate. Other indications wanting. 
Relations and Distribution.—Evidently related to C. subscalariforme, but the 
differences are so marked as to almost exceed the limits of a mere variety, Rare 
in the Sowerbyi-bed of Bradford Abbas. 
This terminates the list of species referred with more or less certainty to the 
Vetustwm-Subgroup. 
74, Curitatum (species or variety). Plate VIII, fig. 14. 
Description.—Probable length 385 mm., spiral angle about 14°. Shell elongate, 
subulate, whorls numerous, convex, and well separated by the suture. The 
spiral lines are fine and numerous, upwards of twelve on the anterior whorls ; one, 
slightly broader than the others, occupies the shoulder of each whorl, forming 
