TROPHON (TROPHONOPSTS) BAILYI. 355 



on p. 133 as a variety (similis) of T. muricatus. They are characterised by the 

 distinct angulation of the upper part of the whorls which causes a square and 

 narrow shelf below the suture. My Wexford specimens vary in size, but have a 

 somewhat similar and rather coarse clathrated sculpture. 



In my Oakley specimens of this variety the outer lip is always strongly 

 denticulated within ; in most of those from Wexford, on the contrary, such orna- 

 ment is not always apparent or is indistinct. M. Dautzenberg informs me that in 

 recent shells a similar feature may sometimes be observed, especially when they are 

 not fully grown. The absence of such ornament from some of these Wexford 

 fossils may be partly due to abrasion, although the exterior of the specimens does 

 not usually seem to be much worn. 



Var. cancellata, nov. Plate XXXVJ, fig. 16, 



Varietal Characters. — Larger than any of the shells of the present group here 

 described, with an elongate spire and coarse, strong cancellate sculpture ; whorls 

 convex, rounded, not angulate below the suture ; mouth oval ; outer lip regularly 

 curved, not angulated. 



Dimensions. — L. 16mm. B. 8 mm. 



Distribution. — Not recorded living. 

 Fossil : Wexford. 



Remarks. — I group this shell, of which I have several of the same kind from 

 Wexford, with those described above as a variety of T. muricatus, though with 

 some doubt. Unfortunately in none of my specimens is the mouth, including the 

 canal, perfect, nor does the outer lip show whether or not it was internally toothed. 

 The sculpture is somewhat similar, however, to that of one of the examples of var. 

 similis ; it is an interesting form which deserves notice. Probably some future 

 discoveries may throw further light on the subject. 



Trophon (Trophonopsis) Bailyi (A. Bell, MS.). Plate XII, fig. 29; Plate 



XXXVI, fig. 11. 



1914. Trophon Fabricii, var. Bailyi, F. W. Harmer, Plioc. Moll. Gt. Brit., pt. i,p. 131, pi. xii, fig. 29. 



Specific Characters. — Shell small, scalariform ; whorls 5, but slightly convex, 

 squarely angular above, with a distinct shelf below the suture, the last much the 

 largest, two-thirds the total length, excavated below ; ornamented by thin, 

 sharply-edged longitudinal costse which extend to the base and cross the shelf 

 obliquely, with an occasional varix, spinous or pointed where it intersects the keel 

 or near the outer lip, also by inconspicuous spiral ridges in the interspaces ; spire 



