94 PLIOCENE MOLLUSCA. 



Var. crassa, King. Plate VII, figs. 1, 2. 



1777. Buccimim undatum, Pennant, Brit. Zool., vol. iv, p. 121, tab. Ixiii, fig. 90. 

 1847. Bticcinum undatum, var. crassa. King, Ann. Mag. Nat. Hist., vol. xix, p. 337. 

 1858. Buccinum undatum, var. crassum, Forbes and Hanley, Brit. Moll., vol. iii, j>. 404. 

 1900-1. Buccimim undatum, Br^gger, Norges geol. uuders^gelse, vol. xxxi, p. 471, fig. 50. 

 1912. Buccinum undatum, var. crassa, Dautzenberg et Fischer, Camp. Scieut. Pr. Monaco, vol. 

 xxxvii (MoUusques), p. 109, pi. v, fig. 2. 



Dliiietisions — (Of Crag Shell.) L. 65 mm. B. 40 mm. 



JDistribiitlon. — Recent : Coasts of Northumberland, Durham and Yorkshire, 

 from 7 to 30 fathoms. Le Croisic, France ; Denmark ; Reykjavik, Iceland (Daut- 

 zenberg) ; Maine, U.S.A. 



Fossil: Newbournian Crag : Waldringfield. Butleyan: Hollesley ; 

 probably elsewhere. Pleistocene : Christiania. 



Remarl:si. — The shell now figured which comes from Waldringfield (Canham coll., 

 Ipswich Museum), a comparatively deep-water variety, belongs to the same group 

 as the variety flex I (OS 0, agreeing with that coarsely sculptured northern form except 

 that it is wider in proportion, and has a shorter spire. It corresponds to some 

 extent with a specimen in the British Museum (Normau collection) labelled var. 

 horealis, and more closely with those given by MM. Dautzenberg and Fischer as 

 var. crassa, and by Prof. Br^gger as B. iindatam. Mr. de B. Tomlin has sent me, 

 moreover, an American shell of a similar character from Casco Bay, Maine. It 

 will be seen in the sequel that there are a number of characteristic American 

 Buccinums in our Crag deposits, some of which occur on both sides of the 

 Atlantic, while others are no longer found in European seas. King thought his 

 var. crassa the same as that figured by Pennant as B. undatum; the variety miLvinia 

 of Dautzenberg and Fischer {op. cit., pi. iv, fig. 11) is a similar but larger shell. 



Var. zetlandica, Forbes. Plate VII, fig. 5. 



1835. Buccinum. undatun), var. zeUandicum, Forbes, Mag. Nat. Hist., vol. viii, p. 593, fig. 62. 



1844. Buccinum anglicanum, Brown, 111. Coucli. Great Brit., 2nd ed., p. 4, pi. iii, figs. 2, 3. 



1853. Buccinum xindatum, var., Forbes an<l Hauler, Brit. Moll., vol. iii, p. 4<)5. 



1869. Buccinum ^lndatu,m, xtiv. zetlandica, Jeffreys, Brit. Condi., vol. iv, p. 286 ; vol. v, ji. 218. pi. 



Ixxxii, fig. 5. 

 1912. Buccimim undatum. var. zetlandica, Dautzenberg et Fislier, Camp. Scieut. Pr. Monaco, vol. 



xxxvii (Mollnsqnes), p. 111. 



Varietal Ghara.cter-<. — Shell less solid and more slender and elongate than the 

 type form ; longitudinal plications when present more numerous but sometimes 

 nearly or wholly obsolete. 



Dimetif<ioiis. — L. 65 mm. B. 30 mm. 



