TROPHON MURICATUS. 131 



Fossil : Waltonian Crag- : Little Oakley. Isle of Man. Pleisto- 

 cene : Worden, Bridlington. Scandinavia (Posselt). 



Remarks. — This species, originally described by Fabricius as Tritonlum cra- 

 flcnhitniii,^ was afterwards identified by Moller and others with Troi)lion Fahririi, 

 Beck. The only one of the earlier authorities mentioned above who has figured the 

 living shell is Reeve, whose specimen of Miire.v horealls [op. cit.) accurately 

 represents what is now recognised under the present name.^ The Bridlington fossil 

 given by Wood is probably intended for this form, and I have one or two immature 

 specimens from Oakley (fig. 28) which seem to be the same. 



There is a specimen of the type-form from the Isle of Man, here figured, in the 

 Museum at Jermyn Street. 



Var. Bailyi (A. Bell), nov. Plate XII, fig. 29. 



1846. Fusus Fabricii, Forbes, Mem. Geol. Surv., vol. i, p. 424 (fig.). 



1850. Troplwn craticulatus, S. V. Wood, Mon. Crag Moll., pt. ii, Appendix, p. 313, tab. xxxi, fig. 4. 



1903. Trophm (Fusus) Fabricii, Lamplugh, Mem. Geol. Survey, Isle of Man, fig. 87, p. 336. 



— Troplwn Baihji, A. Bell, MS. 



Diiiieiisioiis. — L. 12*5 mm. B. 7'5 mm. 



Distrilmtion. — Not known living. 



Fossil : Wexford gravels : Rathaspic. 



Remarks. — This rather famous specimen, which, by the courtesy of the Director 

 of the Geological Survey, I am permitted to figure, is the one found by Capt. James 

 in the Wexford gravels seventy years ago and is still unique. It has been generally 

 known as T. Fabricii, but differs from the typical form of that species by the distinct 

 angulation of the whorls, which form a flat shelf below the suture ; the outer lip 

 ends upwards in a projecting spine ; the general appearance of the upper part of 

 the body-whorl is not unlike that of T. Gnnnerl. Mr. A. Bell has always considered 

 it specifically distinct, and proposes, I believe, to describe it as such under the name 

 of the former palseontologist of the Irish Greological Survey. It belongs, however, 

 to the T. Fabricii group, and I prefer to regard it as a variety of that species. 



Trophon muricatus, Montagu. Plate XII, fig. 18. 



1803. Trophon muricatus, Montagu, Test. Brit., vol. i, p. 262, pi. ix, fig. 2. 



1818. Murex echinatus, J. Sowerby, Min. Concli., vol. ii, p. 226, tab. cxcix, fig. 4. 



1836. Fusus echinatus, Philippi, En. Moll. Sic, vol. i, p. 206, pi. xi, fig. 10. 



1841-70. Trophon muricatus, Gould, Eep. Inv. Mass., ed. 1, p. 293, 1841 ; ed. 2, p. 379, 1870. 



1 Murex craticulatris, Linne, is a different species. 



~ Jeffreys identifies Murex horealis. Reeve, with Fusus Fabricii, Beck, and with Trophon crati- 

 culatus, Pabricius (Brit. Conch., vol. iv, p. 322, 1867). 



