354 PLIOCENE MOLLUSC. \. 



Sub-genus TROPHONOPSIS, Dautzenberg and Dollfus, 1882. 



Trophon (Trophonopsis) muricatus (Montagu). Plate XII, fig. 18 ; Plate XXXVI, 



fig. 12. 



1914. Trophon muricatus, F. W. Harmer, Plioc. Moll. G-t. Brit., pt. i. p. 131, pi. xii, fig. 18. 

 1916. Trophonopsis muricatus, E. B. Newton, Journ. of Conch., vol. xv, p. 76. 



Distribution. — Recent: Mediterranean, Adriatic and iEgean seas (additional). 1 

 Fossil: Lenham (R. B. N.) (additional). 



Remarks. — The name Trophonopsis as sub-generic has been proposed by 

 MM. Dautzenberg and Dollfus for a group of small, slender, fusiform Trophons 

 with clathrated sculpture, having the outer lip crenulated internally, the present 

 species being taken as the type. I have obtained several fairly characteristic 

 specimens of it in the Wexford gravels. T. muricatus seems to be a very variable 

 form, both as recent and fossil. 



As already stated, most of the Wexford Trophons belong to the northern group 

 of these molluscs (Boreotrophon). If the present shell and those I regard as 

 varieties of it are correctly identified, we have also another group of them from 

 the same horizon whose affinities are distinctly southern. 



Var. Bellii, nov. Plate XXXVI, fig. 15. 



Specific Characters. — Belongs to the group with angulated whorls, but has much 

 finer and more delicate sculpture. 



Dimensions. — L. 14 mm. B. 7 mm. 



Distribution. — Not recorded living. 

 Fossil : Wexford. 



Remarks. — I dedicate this charming and, I think, distinct little shell to my old 

 colleague Alfred Bell, who was among the first to call attention to the importance 

 of the Wexford fauna. 



Var. similis, F. W. Harmer. Plate XII, fig. 20; Plate XXXVI, figs. 13, 14; 



Plate XLIV, fig. 20. 



1914. Trophon muricatus, var. similis, F. W. Harmer, Plioc. Moll. Grt. Brit., pt. i, p. 133, pi. xii, 

 fig. 20. 



Distribution. — Fossil : Wexford gravels (additional). 



Remarks. — Among the small Trophons alluded to above are about twenty which 

 correspond more or less closely with a shell from Oakley which T described 



1 Omitted by accident from list in pt. i, p. 132. 



