CERITHIUM. 165 



may sometimes be noticed. There is no trace of axial (longitudinal) orna- 

 mentation. 



Body-whorl rather less than one-third the entire length of the shell, and orna- 

 mented similarly to the whorls of the spire, base spirally striated but not granulated. 

 Aperture restricted, subquadrate, with a relatively large and deeply notched canal, 

 moderately reflexed. 



Relations and Distribution. — The typical specimens are found in the Peagrit 

 of the Cheltenham district, where they occur in two stages, viz. an apical portion 

 without the turrited whorls, and the complete shell as above described. Lately I 

 have received additional specimens, which serve to connect this species with 

 C. Beanii. 



A variety (or possibly another species) with a less acute spiral angle, but with 

 very similar ornamentation, occurs in the Cephalopoda-bed at Frocester and also 

 in the " Lower Limestone " of the Nailsworth district. Specimens of the latter, 

 like nearly all fossils from the " Lower Limestone," are too much worn for 

 figuring. Hence such fossils are only doubtfully referred to G. pisoliticum. 



90. Cerithium (species). Plate IX, fig. 14. 



Description : 



Length . . . .15 mm. 



Width . . . . .5 mm. 



Spiral angle . . . .22°. 



Shell subelongate, strongly turrited ; spiral angle somewhat convex. Whorls 

 nine to ten in number, flat, short, and increasing by gradations. The sculpture is 

 very prominent, consisting of five spirals. The upper row is strongly tuberculated 

 at frequent intervals, thus imparting to the shell a spinose appearance ; the second 

 and third rows are less strongly tuberculate, but the fourth is almost as strong as 

 the first row ; the fifth is feeble, like the second and third. The longitudinal 

 ornaments are coarse and somewhat irregular on account of the unequal tubercu- 

 lation of the spiral rows, the general effect of their decussating with the spirals 

 being a coarse reticulation. 



The body- whorl is barely one-third the entire height of the shell, and similarly 

 ornamented ; base somewhat depressed and spirally striated. Aperture ? sub- 

 quadrate, with a well-marked anterior canal. Other indications wanting. 



Relations and Distribution. — Resembles 0. Chapuiseum, Piette (' Bull. Soc. Greol. 

 France,' 2 me ser., vol. xiv, pi. v, fig. 40), from the Upper Bathonian of Rumigny. 

 Also not unlike G. Beanii, but more rugose, and less pupaeform. Very rare in the 

 Parkinsoni-zcme of the Castle Cary neighbourhood. 



