TROPHON (n.ATHRATUS. 127 



Genus TROPHON, Montfort, 1810. 



Trophon clathratus (Liniie). Plate XII, fig. 25. 



1767. Murex clathratus, Linne, Syst. Nat., ed. xii, p. 1223, uo. 503. 



1800. Murex Bamffius, Douovau, Brit. Shells, vol. ii, pi. clxix, fig. 1. 



1839. Fusus lamellosus. Gray, Zool. Beechey's Voyage, p. 118, pi. xx.wi, fig. 13. 



1841-70. Fusus scalariformis, Gould, Rep. Inv. Mass., ed. 1, p. 288, fig. 203, 1841; ed. 2, p. 378, 



fig. 644, 1870. 

 1848-72. Trophon scalar if orme, S. V. Wood, Mou. Crag Moll., pt. i, p. 48, tab. vi, fig. 7, 1848; 1st 



Suppl., p. 26, tab. iii, fig. 10, 1872. 

 1878. Trophon clathratus, G. 0. Sars, Moll. Eeg. Arct. Norv., p. 247, pi. xv, fig. 10. 

 1887. Trophon clathratus, Kobelt, Icou. schalentrag. europ. Meeresconch., vol. i, p. 25, pi. vi, fig. 8. 

 1889. Fusus scalariformis, Lorie, Bull. Soc. Beige Geol., vol. iii, p. 434. 

 1894. Fusus clathratus, Kendall, Journ. Isle of Man Nat. Hist. Soc, vol. i, p. 419. 

 1903. Trophon clathratus, Lamislugh, Mem. Geol. Surv., Isle of Man, p. 475, fig. 86, p. 336. 

 1912. Tro2)hon {Boreotrophon) clathratus, Dautzenberg et Fischer, Camp. Seient. Pr. Monaco, vol. 



xxxvii (Mollusques), p. 147. 



Specific Characters. — See Mon. Crag Moll., pt. i, p. 48. 



Dimensions. — Y,. 30 mm. B. 13 — 15 mm. 



Distribntion. — Recent: circumpolar :^Siberia, Kara Sea, Nova Zambia, Franz 

 Joseph Land, Russian Lapland, Spitzbergen. Norway, Denmark, Faroes, Iceland, 

 Greenland, Labrador, NeAV England coast. Beliring Strait, northern Japan 

 (D. and ¥.). 



Fossil : Coralline Crag : Boyton. Waltonian : Walton-on-Naze, 

 Beaumont, Little Oakley. Newbournian : Sutton. Butleyan : Butley, Bawdsey ; 

 Icenian — Norwich zone : Bramerton, Thorpe near Norwich, Thorpe, Suffolk. 

 Weybournian zone : Weybourne. Isle of Man. Amstelien : Holland. 



Pleistocene of Great Britain and Ireland (generally distributed), Bridlington, 

 Middle Glacial Sands of Hopton, Billockby, Kelsey Hill, March gravels, Portland 

 Bill. Christiania region. Uddevalla. 



BemarJcs. — This shell was described by Wood as Trophon scalariforme, Gould, 

 but is now regarded as identical with Miirex clathratus, Linne, whose specific name 

 is older and should be adopted for it in our list of Crag fossils. 



Mr. A. Bell informs me he found it years ago in what he regards as Coralline 

 Crag at Boyton, and I have done so more recently at Oakley where it is fairly 

 common. It may be met with everywhere in the Red Crag, moreover, and occurs 

 also at several places in the Icenian, It has not been recorded from the Pliocene 

 of Belgium, but Dr. Lorie has obtained a unique specimen from the Amstelien beds 

 in the Amsterdam boring. We have two varieties of it in the English Crag, one 

 of which may be taken as the type, represented in Wood's figures 7 a and 7 h {op. 

 cit.), having about twelve lamellate costse on the body-whorl, the other being the 



