TIIOIMTON (BORKOTIiOPHOX) MEDKi LA( TALIS. 355 



Var. Coddii, no v. Plate XXXVIII, fig. 21. 



Varietal Characters. — Belonging to the T. Gunneri group, but more slender and 

 less ventricose than the one I take to be the type form of that species. The 

 longitudinal costae, moreover, are less numerous. 



Dimensions. — L. 18 mm. B. 8 mm. 



Distribution. — Fossil : Wexford. 



Remarks. — 1 dedicate this little shell to my good friend, the Rev. Father Codd, 

 in friendly acknowledgment of his valuable assistance in the collection of fossils 

 from these promising Wexford beds. 



It approaches in form and to some extent in sculpture a Norwegian species 

 described by Prof. G. 0. Sars as T. clavatus, but is not sufficiently near to justify 

 its reference to the latter. It may be more probably regarded as a variety of 

 T. Gunneri. Our present specimen is possibly not fully grown. 



Trophon (Boreotrophon) mediglacialis (S. V. Wood). Plate XXXVIII, fig. 22. 



1872. Trophon mediglacialis, S. V. Wood, Mou. Crag Moll., 1st Suppl., pt. i, p. 28, pi. vii, fig. 12. 



Specific Characters. — Shell elongato-fusiform, with rounded whorls ; longi- 

 tudinally ornamented by 8 — 10 obtuse and prominent costas, and spirally by a few 

 raised linear ridges ; mouth ovate, canal elongate (S.V.W.). 



Dimensions. — L. 10 mm. B. 4 mm. 



Distribution. — Not known living. 



Fossil : Middle glacial sands : Billockby, Hopton (? Gorleston) 

 cliff. 



Remarks. — In the Wood collection at the Norwich Museum there are half a 

 dozen specimens labelled, in the well-known writing of the younger Wood, Trophon 

 mediglacialis. They are the same in form and sculpture, but unfortunately are all 

 imperfect, wanting the apex and the canal, which in the original description, 

 quoted above, is said to have been elongate. The original figure given by the 

 artist does not accurately represent the Norwich shells, the spiral sculpture being 

 finer in the latter than in the drawing. It seems desirable therefore to refigure 

 one of them, the identity of which is clearly established. The Billockby section 

 has long been closed, but it may still be possible to obtain some fresh specimens 

 of this interesting form from Hopton (Gorleston) cliff. 



