SUPPLEMENT.— LUDWIGELLA. lxxxvii 



Series B — Ludwigella compkessj:. 



A somewhat parallel series, more compressed and more umbilicate than the 

 preceding. 



6. Ludwigella subeudis, 8. Buchnan. Plate XV, figs. 14, 15; Suppl., Fig. 52 in 



text. 



1889. Ludwigia rudis, This Monogr., PI. xv, figs. 14, 15. 

 1902. Ludwigella subeudis, Emend. Auirn. Nom., p. 4. 



Distinction. — From Ludl. rudis, more compressed and more ) 



umbilicate. ( 



Localities and Strata. — -Dorset: Bradford Abbas, Fossil Bed; ■* 



Sandford Lane, near Sherborne, grey sandstone. ' ii ne of 



Date of Existence. — Concavi hemera. subrudis a 



7. Ludwigella attenuata, 8. Buchnan. Suppl., Plate XIX, figs. 10 — 12. 



Distinction. — From Ludl. cornu, more compressed and more umbilicate; from 

 L. subrudis, less coarse ornament. 



Localities and Strata. — Dorset : Bradford Abbas, in the lower part of the fossil 

 bed; Halfway House, in the " Blue Beds." 



Date of Existence. — Concavi hemera. 



8. Ludwigella tenuis, 8. Buchnan. Suppl., Plate XX, figs. 37 — 39. 



Remarks. — A thin, delicate, and elegant shell, easily separated from Ludl. concava 

 by its more compressed whorls, less distinct costation, and more acute periphery. 

 Locality and Stratum. — Dorset : Stoke Knap, in the Building Stone. 

 Date of Existence. — Concavi hemera, perhaps. 



Series C — Ludwigella PAUCicosTATiE. 



The costse are further apart and proportionately rather coarser than in 

 Series A. 



9. Ludwigella atteacta, 8. Buchnan. Suppl., Plate XIX, figs. 31 — 33. 



Locality. — Dorset : Louse Hill, near Sherborne. 



Date of Existence. — Bradfordensis hemera, presumably. 



10. Ludwigella blanda, S. Buchnan. Suppl., Plate XIX, figs. 22 — 24. 



Distinction. — From Ludl. attracta, smaller umbilicus, less ornament. It is a 

 species parallel with, but presumably preceding, L. cornu, wherefrom it differs by 

 stouter whorls, fewer though rather more marked ribs, and more costate umbilicus. 



