OCINEBRA CANHAMI. 345 



at Boyton forty years ago, which is now in the York Museum. It seems to be 

 closely related to 0. tortuosa, but, as he pointed out, it shows no trace of the 

 coarse spiral sculpture characteristic of the latter species, which even in the many 

 water-worn fossils I have found at Oakley hardly ever fails to be apparent. The 

 Boyton specimen, on the contrary, evidently I think from the Coralline Crag, is 

 quite unworn. I have one or two others, imperfect, in my collection from Oakley. 



Ocinebra Canhami (S. V. Wood). Plate XXXV, figs. 15, 16. 



1872. Murex Canhami, S. V. Wood, Mon. Crag Moll., 1st Suppl., pt. i, p. 30, pi. vii, fig. 14. 

 1890. Murex Canhami, C. Eeid, Plioc. Dep. Brit., p. 247. 



Specific Characters. — Shell small, fragile, oblongo-ovate, fusiform ; whorls 6, 

 depressed and angulate above, the last much the largest, two-thirds the total 

 length ; spire scalariform, rapidly diminishing towards the apex ; ornamented by 

 strong, well-marked spiral ridges and by distant lamelliform varices which become 

 spinous on the keel and cross the shelf between it and the suture ; mouth oval ; 

 canal short; outer lip thickened by the labial varix, angulated by the keel, spinous 

 above. 



Dimensions. — L. 14 mm. B. 7 mm. 



Distribution. — Not known living. 



Fossil : Coralline Crag : Boyton. Waltonian : Walton-on-Naze, 

 Little Oakley. Newbournian : Waldringfield, Newbourn. 



Remarks. — Specimens of this form have been found at various localities in the 

 Crag. They are small, delicate shells ; always maintaining the same general 

 character, unworn, and clearly showing the original sculpture. They offer no 

 suggestion of being derivative. My figures convey a somewhat wrong impression 

 as to their appearance, since they are drawn twice the real size. 



One of the specimens now given is from the Coralline Crag of Boyton, another 

 from the Newbournian Crap; of Waldrinp-field, and I have found one or two others 

 from the Waltonian of Oakley. I agree with Wood in thinking this small delicate 

 species distinct from the thick coarsely sculptured 0. tortuosa or from any of the 

 allied forms of the Coralline or Red Crags. 



The present species was named after the late Rev. H. Canham of Waldringfield, 

 for many years a zealous collector of Crag fossils. 



Ocinebra craticulata (Fabricius). Plate XXXVI, figs. 17 — 19. 



1780. Tritonium craticulatum, Fabricius, Faun. Groenl., p. 400. 



1848. Tritonium (Trophon) craticulatum, Middendorff, Mem. Acad. Imp. Sci. St. Petersb. [6], vol. vi, 

 p. 452, pi. i, fig. 8. 



