BELA GIGANTEA. 291 



Bela Dowsoni (S. V. Wood). Plate XXXII, fig. 18. 



1872. Pleurotoma Bowsoni, S. V. Wood, Mou. Crag Moll., 1st Supp]., pt. i, p. 39, pi. iii, figs. 13, 14. 



Specific Characters. — Shell ovato-fusiform ; whorls 6, convex, obtusely and 

 squarely angulated above, the last tumid, much the largest, about two-thirds the 

 total length ; ornamented by numerous strong longitudinal costge which do not 

 reach the base of the shell, about twenty on the body-whorl, and by rather coarse, 

 closely-set spiral ridges; spire short, turreted, regularly diminishing in size; suture 

 deep; mouth oval, short, rather narrow; outer lip angulated by the keel; inner lip 

 forming a distinct glaze on the pillar. 



Dimensions. — L. 14 mm. B. 7 mm. 



Distribution. — Not known living. 



Fossil : Waltonian Crag : Little Oakley. Newbournian : Wald- 

 ringfield. Butleyan : Butley. Icenian : Reydon near Southwold. 



Pleistocene : Billockby ; Bridlington. 



Bemarhs. — This form, which differs from any of those described by Prof. 

 G. 0. Sars or Mr. Friele and from all the Recent specimens I have received from 

 my Scandinavian correspondents, was reported by Wood from the Icenian Crag 

 of Aldeby,^ from Bridlington and from the Middle Glacial sands of Billockby near 

 Yarmouth. It has been since found by Mr. Ogden at Waldringfield and by myself 

 at Oakley. Wood remarks that B. Dowsoni approaches B. exarata. It is much 

 larger, however, than that species, and the ornamentation is coarser. It may be 

 distinguished also from B. ruguJata or B. nohilis by its strong sculpture. All the 

 specimens known to me from the various horizons of the Crag and from Billockby 

 maintain the same general character, and may be, I think, easily recognized. 



Bela gigantea (Morch). Plate XXXII, fig. 24. 



1869. Pleurotoma (Bela) violacea, var. gigantea, Morch, Ann. Soc. Malac. Belg., vol. iv (Meinoires), 

 p. 22, no. 33. 



1871. Pleurotoma violacea, var. gigantea, A. Bell, Ann. Mag. Nat. Hist. [4], vol. vii, p. 357. 



1872. Pleurotoma arctica ?, S. V. Wood, Mon. Crag Moll., 1st Suppl., p. 45, pi. vi, fig. 9. 



1878. Pleurotoma violacea, var. gigantea, Leclie, Kongl. Svensk. Vet.-Akad. Handl. Stockholm, vol. xvi, 



p. 57, pi. i, fig. 19. 

 1887. Bela violacea, var. gigantea, Aurivillius, Vega Exped. Vet. Jakt., vol. iv, p. 348. 

 1899. Bela violacea, var. gigantea, Posselt, Medd. oni Grr5nl., vol. xxiii, p. 158. 

 1901. Bela gigantea, Knipowitsch, Ann. Mus. St. Pctersbourg, vol. vi, p. 482. 



1 Mr. Crovefoot informs me that the specimen figured by Wood as from Aldeby was really found 

 when digging a well at Reydon Hall near Southwold. 



