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 PI. inflatvm, Phil. (En. Moll. Sic. vol. i, t. 11, f. 24), 

 Fl. Leitfroi/i (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 12 — 13 costse ; is rather 

 more elongate, and has a longer canal ; the stria; 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 costse are not carried below the body of the whorl. 

 Pleurotoma purpurea, Basterot, is in all probability the same as our shell, which differs 

 ivom purpurea, Montague, in being less distinctly cancellated, and in having larger and 

 more elevated ribs ; it is also a shorter shell. 



15. Clavatula plicifera. 8. Wood. Tab. VII, fig. 15. 



Pleurotoma plicifeua. S. Wood. Catalogue. 



CI. Testa elongnto-fusiformi, turritd ; atifractihus convexis, siiperne depressis, longitudi- 

 naliter plicatis, pUcis numerosis, subsinuosis ; transversim striatis ; labro acuta; canali 

 longiusculd. 



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

 sinuated folds, or costulse ; 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. turri- 

 cula, but the costse 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. 



Cancellaria,* Lam. 1801. 

 Purpura, (spec.) Adanson. 

 Admeta. Kroyer. 



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

 sometimes entire ; columella plicated, plicse variable ; outer lip generally sulcated 

 within. 

 1. Cancellaria coronata. Tab. VII, fig. 18 «, 18 5. 



Cancellaria coronata. ScaccM. In Phil. En. Moll. Sic. vol. ii, p. 177, 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^vicosTA. S. Wood. Catalogue 1842. 



* Etym. Cancelli, lattices ; from the exterior of the shell being covered with crossed lines, like lattice- 

 work. 



