TROPHON TRUNCATUS. 129 



Troschel, that the radida is different, and liave separated it from the latter 

 species. 



It was not known to AYood from the Crag, but has been found at Thorpe and 

 Bramerton l)y ]\Ir. James Reeve and myself. As far as I know, it has not been 

 reported from any earlier horizon. In addition to the Pleistocene localities given 

 by Wood I may add that of the March gravels, where, fifty years ago, I obtained 

 several small specimens about 10 mm. in length. Some fossils from Christiania 

 which I received from Dr. 0yen are nnicli larger, measuring 30 mm. by IG mm. 



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



^767. Buccinum truncatum, Strom, K. Norsk. Vid. Selsk. Skiift., vol. iv, p. 369, pi. xvi, fig. 26. 

 1841-70. Tvoplion claihmtns, Gould, Inv. Mass., ed. 1, p. 289, fig. 198, 1841 : ed. 2, p. 377, fig. 643, 



1870. 

 1867. Trophon truncatus, .Jeffreys. Brit. Conch., vol. iv, p. 319, pi. Ixxxiv, fig. 6. 



1877. Trophon dathratus, var. truncata, Jeffreys, Auu. Mag. Nat. Hist. [4], vol. xix, p. 325. 



1878. Trophon truncatus, Gr. O. Sars, Moll. Eeg. Arct. Norv., p. 246, pi. xv, fig. 9. 



1887. Trophon truncatus, Kobelt, Icon, sclialentrag. euvop. Meerescoucli., vol. i, p. 24, pi. vi, figs. 6, 7. 

 1912. Trophon (Boreotrophon) truncatus, Dautzeuberg et Fischer, Camp. Scient. Pr. Monaco, vol. 

 xxxvii (MoUusques), p. 152. 



Specific Gharacters. — Shell ovato-conical ; ornamented by numerous fine, 

 laminar, longitudinal ribs, which fold over towards the mouth, extending to the 

 suture but not to the base of the canal ; surface of all the whorls but the two 

 upper ones covered with minute, close-set and almost imperceptible spiral lines ; 

 spire rather short, ending in an abrupt and somewhat truncated point; whorls 

 convex, the last about two-thirds the total length; suture deep ; mouth oval, Avith 

 a triangular outline, expanding outwards ; canal short and notched, turning to the 

 left, showing externally the lines of growth ; outer lip sharp, curved, smooth 

 inside ; inner lip slight ; pillar curved. 



Dimensions. — L. 6—15 mm. B. 3 — 8 mm. 



Distribution. — Recent: eastern and northern coasts of England; Isle of Man ; 

 Scotland ; southern and eastern coasts of Ireland ; Tenby. 



Norway, from the Christiania fiord to Finmark ; Iceland, Spitzbergen, Grreen- 

 land; North America (eastern and Avestern coasts). 



Fossil : Waltonian Crag : Little Oakley. Butleyan : Butley, 

 Bawdsey. Isle of Man. 



Pleistocene deposits : Scotland, Ireland, March ; Norway ; Sweden — Uddevalla. 



Bemarks. — This species is new to our Crag lists. I have a unique specimen 

 from Oakley, the result of many years' work there. It corresponds in size, texture 

 and ornamentation with some Dr. Jeffreys sent me in 1870, which had been 

 dredged from the Lynn well (the deepest part of the Wash) by Capt. Calver, of 

 H.M.S. " Porcupine." 



17 



