SUPPLE M K XT.— LUDWIG K L LA. lxxxix 



15. Ltjdwigella micka, S. Buckman. Suppl., Plate XIX, figs. 7 — i). 



Localities and Stratum. — Dorset: Louse Hill; Bradford Abbas, in the Fossil 

 Bed. 



Bate of Existence. — Goncavi liemera. 



Series E — Ludwigell2e pingues. 

 Somewhat stout whorls distinguish this series. 



a. Biarciradiatas. 

 Radial line in curves. 



1G. Ltjdwigella glevensis, S. Buckman. Suppl. , Plate XX, figs. 25 — 27. 



Locality and Stratum. — Gloucestershire, from the Cheltenham district, and 

 evidently from the Pea-grit series, by attached matrix. Purchased from the 

 collection of the late Dr. T. Wright, F.R.S. 



Date of Existence. — Murchisonse liemera. 



17. Ltjdwigella aecuata, S. Bad-man. Suppl., Plate XX, figs. 28 — 30. 



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

 specimen has exact position recorded ; it is layer G, that is the bottom. 

 Date of Existence. — Bradfordensis liemera. 



18. Ludwigella casta, S. Buchman. Suppl., Plate XX, figs. 31 — 33. 



Note. — Costae are mostly connate in pairs, in middle of lateral area. Lateral 

 lappet is small and short. 



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

 specimen has the position recorded; it is 5, that is a layer above Ludl. arcuata. 



Date of Existence.— Concavi hemera. 



Note. — The three species, L. glevensis, L. arcuata, Ij. casta, are distinguished by 

 showing a progressive decline in coarseness of costation, in size of umbilicus, and in 

 compression. L. glevensis has a few rather distant coarse ribs in the umbilicus 

 suggestive of the ornament of L. impolita. 



M 



