TROPHON (BOREOTROPHON) TRUNCATUS. 349 



of Genoa, under the present name. They agree in sculpture and in their general 

 character, but the latter is smaller, with the spire shorter and not so slender in 

 proportion. 



Genus TROPHON, Montfort (continued from p. 134). 



Sub-genus BOREOTROPHON, P. Fischer, 1884. 



Trophon (Boreotrophon) truncatus (Strom). Plate XII, figs. 23, 24; Plate 



XXXVI, figs. 22, 23. 



1853. Trophon clathratum, Forbes and Hanley, Brit. Moll., vol. iii, p. 436, pi. cxi, figs. 1, 2. 



1863. Trophon truncatus, Jeffreys, Rep. Brit. Assoc. (Newcastle-on-Tyne), p. 79. 



1866. Trophon truncatus, Jarnieson, Quart. Journ. Geol. Soc, vol. xxii, p. 279. 



1888-93. Trophon truncatus, A. Bell, Rep. Brit. Assoc. (Bath), p. 136, 1888 ; (Leeds), p. 414, 1890 ; 



Proc. Roy. Phys. Soc, Edinb., vol. xii, p. 22, 1893. 

 1892. Trophonopsis truncata, Locard, Coq. mar. Cotes de France, p. 109. 

 1898. Trophon truncatus, Posselt, Medd. om Grrcml., p. 175. 

 1910-15. Trophon truncatus, Odhner, Archiv. Zool., K. Svensk. Vet.-Akad., vol. vii, no. 4, pp. 13, 24, 



1910; K. Svensk. Vet.-Akad. Hand]., vol. liv, p. 178, 1915. 



1914. Trophon truncatus, F. W. Harmer, Plioc. Moll. Grt. Brit,, pt. i, p. 129, pi. xii, figs. 23, 24. 



1915. Trophon truncatus, Johnson, Boston Soc. Nat. Hist., Occ. Papers, vol. vii, Fauna of New 

 Engl., pt. xiii, p. 131. 



Distribution. — Recent : (additional) Faroes, Murman coast, Barents sea, arotic 

 shores of Siberia. 



Fossil: Newbournian Crag : Felixstow. Wexford. Pleistocene: 

 Kelsea Hill, Bridlington, Caithness, Clyde beds, Belfast, Ballyrudder. 



Remarks. — Much difference of opinion has existed as to the nomenclature of the 

 shells known as T. truncatus, T. bamffius and T. clathratus, some authorities 

 regarding them as varieties of one species, others as specifically distinct. As to 

 T. truncatus, however, it is now generally agreed that the type form is a small 

 shell with numerous fine costse, represented, for example, by the recent specimen 

 figured under that name by Jeffreys in the 'British Conchology ' (vol. v, 

 pi. lxxxiv, fig. 6). It is the T. clathratus of Gould. 1 With this form I group, 

 as varieties, one of the specimens figured by Donovan as T. Bamffius (Brit. Shells, 

 pi. clxix, fig. 1) with certain other multicostate and allied shells. 



The typical T. truncatus occurs but rarely in the Crag; it is more common in 

 our Pleistocene deposits, and is exceedingly abundant at Wexford. Out of some 

 hundreds of Trophons received from that locality by far the larger number belong 

 to this species and its varieties. 



1 Rep. Invert. Mass., ed. 2, p. 377, fig. 643, 1870. 



