SUPPLEMENT.— LUDWIGIA. 



lxx 



4. Ludwigia geadata, 8. Buckmati. Fig. 27 iu text. 



? 1878. Ludwtgia MuitcnrsoNiE, Bayle (non Sowerby), Explic. carte geol. France, 



pi. lxxxv, fig. 1 only. 

 Description.— Platy-subleptogyral, gradumbilicate ; parvicostate. 

 Distinction.— -From 7v. Murchisonx, less coarse ornament, and a smaller um- 

 bilicus. 



Fig. 27. — Ludwigia gradata. Near Sherborne. 



Remarks. — The agreement with Bayle's figure seems to be close, yet our 

 specimens are more densiseptate. 



Localities and Strata. — Dorset : near Sherborne, from a bluish stone ; Bradford 

 Abbas [Paving Bed] (Monk Collection) ; Somerset : Haselbury, from the " lower 

 beds." Foreign : Normandy, " May-sur-Orne, Murchisonx [beds] " (Dr. L. 

 Brasil). 



5. Ludwigia laevigata, 8. Buckman. Suppl., Plate XI, figs. 13—15. 



Description. — Platyleptogyral, subangusti-gradumbilicate, parvicostate de- 

 clining to levigate. 



Distinction. — From L. gradata, smaller umbilicus, less definite costse. 



Note. — The interest attaching to this species is its homceoinorphy to Wiltshireia 

 gigantea, to the specimen figured in Suppl., PI. XV., figs. 7, 8. It differs, however, 

 markedly in the size of its superior lateral lobe. 



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

 Stone. 



Date of Existence. — Murchisonx heniera. 



