64 MOLLUSCA FROM THE CRAG. 



Of this species I have but a few specimens, and those appear restricted to the 

 Red Crag. It approaches in form PL inflatum, Phil. (En. Moll. Sic. vol. i, 1. 11, f . 24), 

 PL Leufroyi (vol. ii, p. 165), and upon comparison with specimens of that shell may 

 possibly be found to be the same species. The Crag shell has from 12 — 13 costse ; 

 is rather more elongate, and has a longer canal ; the striae upon the exterior are 

 alternately one large and one small. The outer lip is contracted at the lower part, 

 forming a distinct but open canal, and the costos are not carried below the body of 

 the whorl. Pleurotoma purpurea, Basterot, is in all probability the same as our shell, 

 which differs from purpurea, Montague, in being less distinctly cancellated, and in 

 having larger and more elevated ribs ; it is also a shorter shell. 



15. Clavatdla plicefeea. 8. Wood. Tab. VII, fig. 15. 



Pleurotoma plicifera S. Wood. Catalogue 1842. 



CI. Testa elongato-fusiformi, turritd; anfractibus convexis, superne depressis, longitudi- 

 naliter plicatis, plicis numerosis, stibsinuosis ; transversim striatis ; labro acuto ; canali 

 Jongiusculd. 



Shell elongato-fusiform, turreted ; whorls subangulated, with longitudinal sub- 

 sinuated folds, or costulas ; transversely striated; aperture ovate; canal moderate. 



Axis, f of an inch. 



Locality. Red Crag, Sutton. 



But one specimen of this species is in my cabinet. It appears distinct from any 

 species I have seen, in the peculiar curvature of the outer lip, which gives an 

 elegant flexion to the folds or ribs. The sinus is rather below the suture, like that 

 in CI. turricula, but the costas in that shell are much more erect. It is, however, 

 not a well-determined species, and the above name may be considered as provisional 

 until more perfect specimens are found. It may be here remarked, that many of 

 the specimens belonging to this genus, found in the Crag, are far from being in 

 good condition, and the identifications of some of the species are by no means 

 satisfactory. 



Cancellable,* Lam. 1801. 



Purpura, (spec.) Adanson. 

 Ad M ETA. Kr'vyer. 



Gen. Char. Shell ovate, fusiform or turriculate, costated ; aperture subcanalicu- 

 lated, sometimes entire ; columella plicated, plica? variable ; outer lip generally 

 sulcated within. 



1. Cancellaria coeonata. Tab. VII, fig. 18 a, 18 £. 



Cancellaria coronata. Scacchi. In Phil. En. Moll. Sic. vol. ii, p. 1/7, t. 25, fig. 24, 1844. 



— varicosa. Phil. En. Moll. Sic. vol. i, p. 201, 1836. 



— — Nyst. Coq. foss. de Belg., p. 475, pi. 38, fig. 20. 

 l^evicosta. #. Wood. Catalogue 1 842. 



Etym. CuHcelii, lattices; from the exterior of the shell being covered with crossed lines, like 

 lattice-work 



