clxxxvi INFERIOR OOLITE AMMONITES. 



Localities and Strata. — Gloucestershire : Perm Wood, Cephalopoda Bed 

 (" Dumortieria Beds ") ; Cam Down, similarly. 

 Date of Existence. — Dumortierix hemera. 



37. Dumortieria subundulata (Branco). Plate XLV, figs. 1 — 3. 



1879. Harpoceras subundulatum, Branco, Tint. Dogger, Abh. Geol. Spez. Karte 



Elsass-Lotliringen, Bd. ii, PI. iii, 

 fig. 4 only. 



1892. Dumortieria SUBUNDULATA, This Monogr., PI. xlv, figs. 1 — 3. 



Distinction, — From D. explanata, the more acute periphery, the more distant 

 ribs. 



Localities and Strata, — Gloucestershire : Buckholt Wood, Moorei Beds ; Bowcott 

 Wood. 



38. Dumortieria rustica, S. Buchman, Plate XLV, figs. 4, 5 (type), figs. 10 — 12. 



1892. Dumortieria subundulata, This Monogr., PI. xlv, figs. 4, 5, 10 — 12. 

 1902. — rustica, Emend. Amm. Nom., p. 5. 



Description. — Subplatysubleptogyral, latumbilicate ; costate passing to spissi- 

 parvicostate ; periphery f astigate, subcarinate. 



Distinction. — From D. subundulata, more numerous and closer set costse; thinner 

 whorls. From D. explanata, decline to parvicostate stage, sharper periphery. 



Localities and Strata. — Gloucestershire : Penn Wood, Cam Down, in the Cepha- 

 lopod Bed. 



39. Dumortieria munda, S. Buchman. Plate XLIV, figs. 10 — 12. 



1891. Dumortieria subundulata, This Monogr., PI. xliv, figs. 10 — 12 only. 

 1902. — munda, Emend. Amm. Nom., p. 5. 



Description. — Subplatysubleptogyral, sublatumbilicate ; subcostate passing to 

 striate; fasciate; periphery f astigate, parvicarinate. 



Distinction. — From Dam, rustica, the finer ornament, the smaller umbilicus. 



40. Dumortieria Brancoi, S. Buchman. Plate XLV, figs. 8, 9. 



1879. Harpoceras pseudoradiosum, Branco, Unt. Dogger, Abh. Geol. Spez. 



Karte Elsass-Lothringen, Bd. ii, 

 PI. ii, fig. 3 only. 



1892. Dumortieria subundulata, This Monogr., PI. xlv, figs. 8, 9. 



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



