346 PLIOCENE MOLLUSCA. 



1878. Murex craticulatus, Philippi, Martini uud Chemnitz, Concli. Cab., ed. 2, vol. iii (Murex), p. 30, 



pi. xii, figs. 3, 4. 

 1880. Trophon craticulatus, Tryoii and Pilsbury, Man. Conch., vol. ii, p. 139, pi. xxxi, figs. 309, 310. 

 1910. Trophon craticulatus, Odhner, Archiv Zool., K. Svensk. Vet.-Altad., vol. vii, no. 4, pp. 13, 24. 

 1914. Trophon Fabricii, F. W. Harmer, Plioc. Moll. Gt. Brit., pt. i. p. 130. 



Dimensions. — L. 35 mm. B. 18 mm. 

 Distribution. — Fossil : Wexford gravels (additional). 



Remarks. — Considerable difference of opinion has existed as to the correct 

 nomenclature, both generic and specific, of this shell. Originally described as a 

 Trilonmm by Fabricius and Middendorff, and afterwards by Reeve and Philippi as 

 a Murex, it has been generally referred to the genus Trophon. 



The specific name craticulatus, moreover, originally proposed by Fabricius, was 

 altered by Jeffreys to Fabricii, Beck, on the ground that the former had been 

 previously used by Linne for a Murex (M. craticulatus), which he said was really a 

 Trophon. 1 The latter seems, however, to be a different species. At present our 

 shell is usually known under the specific name of craticulatus, which I now adopt 

 in place of the Fabricii of p. 130. M. Dollfus considers, however, and I think with 

 reason, that it belongs to the genus Ocinebra rather than to Trophon. 



The recent example of this form here represented (PI. XXXVI, fig. 17) may be 

 regarded as typical, corresponding generally with the figures of Trophon craticulatum 

 given by Middendorff and Kobelt, and of Murex borealis by Reeve. It may be 

 recognised by its thin, variciform and irregularly placed costee, which cross the 

 shelf below the suture obliquely, and by its rather distant spiral ridges extending 

 as far as the keel but not to the shelf. I have obtained several imperfect 

 specimens from "Wexford which agree more or less nearly with the type (fig. 17) 

 but are smaller in size. 



Var. reticulata, nov. Plate XII, fig. 28; Plate XXXVI, figs. 20, 21. 



1872. Trophon craticulatus, S. V. Wood, Mon. Crag Moll., 1st Suppl., pt. i, p. 25, pi. iii, fig. 1. 

 1914. Trophon Fabricii, F. W. Harmer, Plioc. Moll. Gt. Brit,, pt. i, p. 130, pi. xii, fig. 28. 



Varietal Characters. — Differs from the type in size, form and sculpture, being 

 small and shorter in proportion ; the sculpture is reticulate, the costas and spiral 

 ridges are nearly equal, the latter being more prominent and less numerous. 



Dimensions. — L. 19 mm. B. 12 mm. 



Distribution. — Fossil; Waltonian Crag: Little Oakley. Wexford, Bridlington. 



Remarks. — The fossils here given may be regarded, I think, as a dwarf variety 

 of O. craticulata, although a very distinct one. The Bridlington shell (fig. 20), 

 which I refigure for the purpose of comparison, is that originally described by 



1 Ann. Mag. Nat. Hist, [4], vol. xix, p. 326. 



