SUPPLEMENT.— GRAPHOCERAS. xcvii 



5. Graphoceras mieabile, 8. Buclcman. Suppl., Plate XV, figs. 12 — 14. 

 Description. — Subconcavumbilicate, pauci-subcrassicostate. 



Localities and Strata. — Dorset : Bradford Abbas, Fossil Bed (Collection of Mr. 



D. Stephens). Somerset: Dundry, limestone and marl beds (Collection of Mr. 



E. Wilson), not so costate, leading towards G. stigmosum. 

 Date of Existence. — Concavi hemera, perhaps. 



6. Graphoceras stigmosum, 8. Buckman. Plate IX, figs. 5, 6 ; Fig. 59 in text. 



1888. Lioceeas concavum, var. v-scriptum, This Monogr , 



PI. ix, figs. 5, 6. J\ 



1902. Gkaphoceras stigmosum, Emend. Amm. Nom., p. 4. 



Description. — Concavmnbilicate, costate. 



Localities and Strata. — Dorset: Bradford Abbas, Fossil Bed 

 Sandford Lane, near Sherborne, with G. undulatum. 



Fig. 59. — Radial line 



of Graphoceras 



stigmosum. 



7. Graphoceras aff. stigmosum. Plate IX, figs. 8 — 10. 



1888. Lioceras concavum, abnormal form. This Monogr., PL ix, figs. 8 — 10. 



Remarks. — Accompanying G. stigmosum are specimens similar, but with a 

 smaller umbilicus. In PI. IX, fig. 8 is given a representation of the form. 



The specimen is abnormal on one side. It may be noted that the abnormality 

 is hypostrophic — a return to the wider umbilicus, and to the coarse costse of the 

 inner area seen in G. rohustum and G. mirabile. 



Localities and Strata. — As mentioned for G. stigmosum; and Somerset: Dundry. 



8. Graphoceras undulatum, 8. Buckman. Plate X, fig. 9; Plate A, fig. 19. 



1888. Lioceras concavum, var., This Monogr., PI. x, fig. 9 ; 1889, PL A, 



fig. 19. 

 1902. Gtraphoceras undulatum, Emend. Amm. Nom., p. 4. 



Description. — Concavumbilicate, striicostate with median undulations. 



Remarks. — In the middle of the lateral area, where the radii form their angles, 

 are a series of wave-like bulgings, and from each of them proceed generally two of 

 the costae belonging to the outer area. 



Distinction. — From any other species of the genus, the undulate character of 

 the costae on the median part of the lateral area. 



Localities and Strata. — Dorset: Bradford Abbas, Fossil Bed: the two largest 

 specimens nearly 110 mm. in diameter; Sandford Lane, near Sherborne (' Q. .). 

 G. S.,' vol. xlix, p. 493, sect, ix, bed 11 or 13). 



Date of Existence. — Concavi hemera. 



N 



