406 PLIOCENE MOLLUSCA. 



wide, oval ; outer lip expanded with a thin edge, hut strengthened behind by the 

 last rib and continuous with a short canal ; columella with two distinct folds. 



Dimensions. — L. 6 mm. B. 3 mm. 



Distribution. — Not known living. 



Fossil : Gedgravian Crag : Gedgrave. 



Remarks. — This minute shell is from the Wood Collection at the Norwich 

 Castle Museum. It seems to belong to the serrata group, but I do not think it can 

 be regarded as a variety of that species. As I cannot find anything to which I 

 may satisfactorily refer it, I describe it provisionally under the above name. In 

 form and size it approaches an Antwerp fossil, G. minuta, Nyst (Coq. foss. Terr. 

 tert. Belg., p. 482, pi. xxxviii, fig. 23, 1843), but, if we may depend on the correctness 

 of Nyst's figure, the sculpture of that species is much finer and more delicate. 



Genus ADMETE, Kroyer, 1842. 

 Admete viridula (Fabricius). Plate XXXIX, figs. 42—47. 



1780. Tritonium viridulum, Fabricius, Faun. Groenl., p. 402. 



1818. Mtirex costellifer, J. Sowerby, Min. Couch., vol. ii, p. 225, pi. cxcix, fig. 3. 



1846. Cancellaria viridula, Loven, K. Svensk. Vet.-Akad. F6rh., vol. iii, p. 87. 



1848-74. Cancellaria costellifera, S. V. Wood, Mon. Crag Moll., pt. i, p. 66, pi. vii, fig. 24, 1848 ; 



C. (Admete) viridula, 1st Suppl., pt. ii, p. 206, 1874. 

 1869-71. Admete viridula, Jeffreys, Brit. Conch., vol. v, p. 216, 1869; in Prestwich, Quart. Journ. 



Geol. Soc, vol. xxvii, pp. 142, 487, 1871. 

 1872. Admete viridula, A. and R. Bell, Proc. Geol. Assoc, vol. ii, pp. 203, 209, 213, 215. 

 1874-92. Cancellaria viridula, Van den Broeck, Ann. Soc. Roy. Malac. Belg., vol. ix, p. 292, 1874 ; 



Bull. Soc. Beige Geol., vol. vi (Memoires), p. 121, 1892. 

 1878. Admete viridula, G. O. Sars, Moll. Reg. arct. Norv., pp. 216, 361, pi. xiii, fig. 1 a ; var. producta, 



p. 217, pi. xiii, fig. 2. 

 1881. Cancellaria (Admete) viridula, Nyst, Conch. Terr. Tert. Belg., p. 11, pi. i, fig. 7. 

 1887. Admete viridula, Morch and Poulsen, MS. list in Geol. Museum, Copenhagen, no. 30 (un- 

 published). 

 1887. Admete viridula, Kobelt, Martini und Chemnitz, Conch. Cab., ed. 2, vol. iv (Cancellaria), p. 98. 

 1890. Cancellaria viridula, C. Reid, Plioc. Dep. Britain, p. 240, pi. iv, fig. 4. 

 1899. Admete viridula, Posselt, Medd. om Gr^nl., vol. xxiii, p. 166. 

 1899. Cancellaria viridula, Locard, Coq. mar. Cotes de France, p. 54. 

 1901. Admete viridula, Br0gger, Norg. geol. Unders0gelse, no. 31, p. 653, pi. ii, fig. 4. 

 1910-15. Admete viridula, Odhner, Archiv Zool., K. Svensk. Vet.-Akad., vol. vii, no. 4, p. 24, 1910 ; 



K. Svensk. Vet.-Akad. Handl., vol. liv, p. 207, 1915. 

 1912. Cancellaria viridida, Tesch. Med. v. d. Rijks. v. Delfstoffen, no. 4, p. 86, no. 215. 

 1912. Admete viridida and vars , Dautzenberg et Fischer, Camp, scient. Pr. Monaco, vol. xxxvii 



(Mollusques), p. 55. 1 

 1915. Admete viridula, A. Bell, Geol. Mag. [6], vol. ii, p. 168. 



1 MM. Dautzenberg and Fischer, in the above-named work, gave a list of more than 100 references 

 to the present species and its varieties. 



