LEBESCONTIA OCCULTA. 



203 



Ortbis Berthoisi, Eouault. 



— raundse, Sharpe. 



— noctilio, Sharpe. 



— Ribeiroi, Sharpe. 



Encrinites Andegavensis, Trom. and 



Leb. 

 Petraia ? insolita. Trom. and Leb. 



In M. Lebesconte's Collection the following, besides the Dithyrocarid, were 

 observed from Renaze : — genal and pleural spines of Trilobites, Eurypterid 

 fragments, Crinoid stems (Triacrinus), part of an arm of an Asteriad (Loriolaster ?), 

 Pteropodal (?) shells, also remains of Brachiopods and of Molluscan bivalves. 



Note. — It is possible that Fig. 12 a does not represent a truly bivalved test, 

 but that the two moieties of a flat carapace have been squeezed horizontally into 

 a narrow boat-shape. 



II. Lebf.scontia occulta, sp. nov. Woodcuts, Figs. 14, 15, and 16. 



Fig. 14. — Lebescontia occulta, sp. nov. Right moiety of carapace, magnified 1£ diam. 



Fig. Id.— Lebescontia occulta, sp. nov. Counterpart, showing the impression of the right valve, Fig. 14; probably the 

 loss of the outermost film has exposed the striae more distinctly ; magnified 1J diam. 



Figs. 16 a, b.— Part of the structure of the dorsal margin, where the arrow points in Fig. 14; magnified 10 diam. 



Since describing M. P. Lebesconte's Breton specimens, Figs. 11, 12, 13, at 

 page 199, we have met with, among some Carboniferous fossils lent to us by Mr. 



