14 TYPE AMMONITES— III Mar. 



nor contradictory in the other than the phrases sharp axe and blunt axe, 

 when " axe " really means a " sharp implement." The terms will be 

 useful for other families. 



Radstockiceras S. Buckman 1918, (Jur. Chron. Q.J.G.S., LXXIII, 

 287), " Type R. complicatum, [xxvn, 1] ". Oxygastric oxycone with 

 highly complicated S.L. 



Gleviceras, S. Buckman 1918, (Op. cit. 289). Type, G. glevense 

 (paratype) [xxvm, 2]." Amblygastric oxycone, with somewhat com- 

 plicated S.L. and regular ribbing. 



Guibaliceras. S. Buckman 1918, (Op. cit. 293). " Type, Am. 

 guibalianus D'Orbigny, Pal. franc. Terr. Jur. Ceph, pi. lxxiii." Sub- 

 oxygastric oxycone, with somewhat simple S.L., — EL much longer than 

 L 1 — , and intermittent ribbing. 



Victoriceras. S. Buckman 1918 (Op. cit. 293). " Type, Ammon- 

 ites victoris Dumortier, Bassin Rhone ii, pi. [xlii], figs. 1 and 2 " ; 

 pi. xlv " is a misprint. Amblygastric oxycone, with somewhat simple 

 S.L., — EL and L 1 about equal — , dichotomous ribbing and test radially 

 striate with punctae in the striae. T.A. CXXXVI. 



Tutchericeras S. Buckman 1919 ; Genotype T. perfoliatum, 

 T.A., Legend of PI. CXXXVIIa. Amblygastric oxycone with highly- 

 complicated S.L. somewhat feeble ribbing and test radially capillate, 

 not punctate. 



Fastigiceras S. Buckman 1919 ; Genotype F. clausum, T.A., 

 Legend of PL CXLIV. Amblygastric oxycone, fastigate in whorl-section 

 and almost clausumbilicate. S.L. quite simple, ribbing obsolete. 



These six genera with Oxynoticeras take the following natural order 

 according to position marks (see op. cit. p. 296), Tutchericeras having 

 the following marks — ES, 6, L 1 , 7, Periphery, 1, Ribbing, 2, Umbilicus, 

 4 ; and Fastigiceras having 1, 3, 4, 1, 7 for the same : — 



Radstockiceras " . ' • '  30 



Victoriceras .  22 



Oxynoticeras ' • 22 



Tutchericeras 20 



Fastigiceras   16 



Guibaliceras 16 



Gleviceras 14 



Family CADOCERATIDM 



See Y.T.A., II, xiii and b. 



Eboraciceras, see Y.T.A., II, xiv. The holotype of Am. 

 ordinarius, Bean-Leckenby, has been kindly sent by Mr. H. Woods, 

 F.R.S., from the Sedgwick Museum, Cambridge. The species belongs 

 to this genus, a stage earlier than E. dissimile (Y.T.A., II, 118) ; cf. 

 Am. lamberti pinguis, Quenstedt , 1887, xc, 15. 



Scotland, England, France, Germany ; Divesian. 



Lamberticeras, g. n. Genoholotype, L. lamberti, J. Sowerby sp. 

 — a topotype so identified, in Mr. Tutcher's Coll. (PI. CLIV). 



Oxygastric platycone ; costate, non-tuberculate, V on S 2 ; 

 periphery 2, crenulate by V-ribs. Versiradii with prorsiradiate curve 

 to mid-periphery ; primaries occasionally bifurcate, usually separated 

 by 3 unconnected secondaries. S.L. simple, with short, broad lobes ; 

 L 1 just beyond guide-line, L 2 just touching. Swollen stage slight, 

 only around umbilicus. England, (Foreign ?) ; Divesian. 



