SUPPLEMENT.— DUM0RTIER1 A. clxxxv 



A. The Latescens series. 



33. Dumortieria latescens, 8. Buckman. Plate XLIII, figs. 8 — 10. Suppl., Fig. 



185, p. exevi. 



1890. Dumortieria suBUNDULATA, This Monogr., PL xliii, figs. 8 — 10. 

 1902. — latescens, Emend. Aram, Noin., p. 5. 



Description. — Subplatyleptogyral ; latumbilicate ; parvicostate (with an inter- 

 mediate striate stage) passing to somewhat smooth (with irregular obscure ribs). 

 Periphery subacutifastigate to convex, parci- to obsoleticarinate. 



Remarks. — In other specimens the intermediate striate stage is more pro- 

 nounced. 



Localities and Strata. — Somerset : Stoford, shelly beds of Yeovil Sands ; North 

 Stoke, near Bath (Cotteswold district) sandy strata in Cephalopod Bed, collected 

 by the late E. Wilson, F.G.S. 



Date of Existence. — Moorei, or Dumortierix hemera. 



34. Dumortieria akenaria, 8. Buckman. Suppl., Plate XXII, figs. 34 — 3G. 



Description. — Subplatyleptogyral ; latumbilicate ; costate declining to parvicos- 

 tate and to irregulari-subcostate ; periphery acutifastigate, parvicarinate. 



Distinction. — From D. latescens, coarser, more distant, costse, sharper periphery. 

 Locality and Stratum. — Dorset : Bradford Abbas, in the Yeovil Sands. 

 Date of Existence. — Moorei hemera, presumably. 



B. The Siibundulata (or dwarf) series. 



35. Dumortieria tabulata, 8. Buckman. Suppl., Plate XXII, figs. 25 — 27. 



Description. — Subplatysubleptogyral (almost subpachygyral) ; latumbilicate ; 

 costate ; periphery tabulate, parvicarinate. 



Locality and Stratum. — Gloucestershire : Penn Wood, Cephalopoda Bed 

 (" Dumortieria Beds "), E. Wilson. 



36. Dumortiera explanata, S. Buckman. Suppl., Plate XXII, figs. 28 — 30. 



Description. — Subplatysubleptogyral (almost leptogyral) ; latumbilicate ; costate ; 

 periphery subtabulate, parvicarinate. 



Distinction. — From D. tabulata, the thinner whorls, and less tabulate periphery. 



A A 



