GASTEROPODA. 77 



Axis, | of an inch. 



Locality. Mam. Crag, Bridlington. 



The specimen figured is from the Museum of the Philosophic Society of York, and 

 was obtained at Bridlington, where, I am informed by Mr. Charlesvvorth, who sent the 

 specimen, it is not very rare. It much resembles a recent and undescribed species, 

 said by Mr. G. B. Sow r erby, sen., to be from the north-west coast of Africa. 



Its distinguishing character is the number of ridges upon the volution. These are 

 placed at regular distances, the lower one projecting a little, which gives the whorl a 

 slight conoidal form ; the lines of growth are rough and imbricated, and most distinct 

 between the ridges, which are somewhat rubbed and rounded. A sub quadrangular 

 form of volution gives it an angular edge and a flat base, which has three or four spiral 

 striae or ridges, the outer ones most prominent, with elevated lines of growth. The 

 columella is nearly straight, with a subcanaliculated base, or everted left lip, bringing 

 this species into close approximation with Cerithium. It is one of those shells by 

 which the two genera might be connected. 



A fragment of a specimen of Turritella from the same locality, apparently a 

 distinct species, was given to me by my friend F. Edwards, Esq., though it is too 

 imperfect for figuring or description. 



PYRAMIDELLA,* Lam. 1815. 



Gen. Char. Shell turreted, elongato-pyramidal, generally smooth and glossy, some- 

 times costated, composed of numerous closely-set volutions ; aperture subcanaliculated ; 

 columella nearly straight, with several folds or ridges. 



I. PYRAMIDELLA L.EVIUSCULA. 8. Wood. Tab. IX, fig. 2, a b. 



PYRAMIDELLA UNISULCATA (?). Dujardin. Mem. Soc. Geol. de France, t. 11, 1837. 

 PYRAMIDELLA L^EVIUSCULA. Grateloup. Bord. foss. pi. 7, fig. 79, 80, 1838. 

 TEREBELLATA. S. Wood. Catalogue 1842. 



Nytt. Coq. foss. de Belg. p. 431, pi. 37, fig. 28, 1844. 



P. Testa elongato-turritd, Icemgatd, politd, apice obtuso ; anfractibus 8 9 planatis ; 

 suturd subsulcatd ; aperturd subovatd ; labro acuto, intus dentato ; columella recta ; Iripli- 

 catd, plicis mcequalibus. 



Shell elongato-turriculate, smooth, and glossy, with an obtuse apex ; whorls flat, 

 about nine in number ; suture distinct, deep, subcanaliculated ; aperture subovate ; outer 

 lip sharp, toothed within ; columella straight, slightly replicate, with three unequal 

 folds. 



Axis, -^ of an inch. 



Locality. Cor. Crag, Sutton. 



A very abundant species. This shell appears to be identical with the Belgian 



* Etym. Pyramis, pyramid or spire. 



