SUPPLEMENT.— WALKERIA. cxxxix 



7. Pleydellia? mactea? (Dumortier). Plate XXX, figs. 3, 4; Suppl., Fig. 119, 



p. clxvii. 

 1890. Grammoceras mactra, This Monogr., PI. xxx, figs. 3, 4 ; p. 176. 

 1902. Pleydellia mactra. Emend. Amm. Norn., p. 4. 



Remarks. — The identification is by no means satisfactory, in spite of very 

 considerable resemblance. My efforts to obtain local information concerning the 

 type have been unsuccessful. 



8. Pleydellia? sp. B., Plate XXXI, figs. 7—0; Suppl., Fig. 120, p. clxvii. 



1890. Grammoceras subserrodens, This Monogr., PI. xxxi, figs. 7 — 9; p. 179 



(pars). 



Remarks. — The shape seems the same as that of Branco's species, but the 

 ornament differs ; lacks the carina of Pleydellia. 



LVIL Genus — Walkeeia, 1 S. Buckman. 



(Type : Walkeria deJlcata, sp. n.) 

 1902. Walkeria, Emend. Amm. Nom., p. 5. 



Definition. — Subplatyleptogyral, sublatumbilicate ; laterally flexiradiate ; peri- 

 pherally subacutanguliradiate, subfastigate, parvicarinate. 



Distinction. — From Pleydellia, radial line more curved laterally, more projected 

 peripherally, carina less definite, whorls less compressed. 



1. Walkeria aecuata, S. Buckman. Plate XXXII, figs. 11, 12; Suppl., Fig. 121, 



p. clxvii. 



1890. Grammoceras, sp., This Monogr., PI. xxxii, figs. 11, 12 ; p. 191. 

 1902. Walkeria arcuata, Emend. Amm. Norn., p. 5. 



Description. — Costate, showing slight decline. 



Localities and Strata. — Gloucestershire : Haresfield Hill, Cephalopod Bed, 

 upper part ; Dorset : Chideock Quarry Hill, towards top of Yeovil Sands. 

 Date of Existence. — Aalensis hemera. 



2. Walkeeia euetonensis, S. Buckman. Plate XXXII, figs. 9, 10. 



1890. Grammoceras aalense, This Monogr., PI. xxxii, figs. 9, 10. 

 1902. Walkeria burtonensis, Emend. Amm. Nom., p. 5. 



Description. — Costate passing to spissiparvicostate, and declining. 

 1 In compliment to Mr. J. F. Walker, M.A., F.G.S. 



