BUDLEIGH-SALTERTON PEBBLE-BED. 361 



41. Orthis Valpyana, Dav. Sil. Mon., PI. XXXII, figs. 29—33; B. S. Sup., 



PL XLI, figs. 21, 22. 



I have nothing to add to the description of this species given at p. 235 of ray 

 Silurian Monograph. 



Orthis exornata, Sharpe (' Quarterly Journal of the Geol. Soc.,' vol. ix, p. 153, 

 pi. viii, fig. 2), is stated by M. de Tromelin to occur at Budleigh-Salterton (' Bull. Soc. 

 Geol. de France/ 3rd ser., vol. iv, p. 596, 1877), but I did not find it in any of the 

 many collections of specimens from that place, which have passed through my hands 

 for examination ; and consequently I quote it as a Budleigh-Salterton fossil on M. de 

 Tromelin's authority. The same geologist states that this species is not very rare at La 

 Bouexiere; that it likewise occurs, but more rarely, at St. Germain and at Champeaux, 

 and in the quartzites of May, in Normandy. In Portugal it is quoted by Sharpe from 

 the Lower Silurian at Sazes, and Porto de Santa Anna, in the Serra de Bussaco. 



I regret that, M. de Tromelin having mislaid his Budleigh-Salterton specimen, I have 

 not been able to see it or to give a figure of it. 



LOWER SILURIAN SPECIES. 



2. Species referable to the Age oe the " Gres Armoricain," Rouault, and 

 which M. Gaston de Tromelin refers to the lowest portion op the 

 Llandeilo, or even, perhaps, to the " Stiper Stones." 



42. Lingula? Lesueuri, Rouault. Dav., Sil. Mon., PL I, figs. 1 — 11; B. S. Sup., 



PL XL, figs. 16—20. 



Lingula Lesueuri, Rouault. Bull. Soc. Geol. de France, 2nd. ser., vol. vii, p. 727, 



1850. 1 

 — ? — Dav. Geological Magazine, new series, vol. vii, p. 341, pi. x, 



fig. 7, 1880. 



1 " Coquille mince, tres allongee, tronquee carrement en avant; les parties laterales du bord repre- 

 sented deux lignes droites ; formant avec celle anterieure des angles droits a peine emousses ; ces 

 parties laterales du bord ne prcsentent qu'une faible courbure en venant gagner la cbarniere ; ce qui 

 donne a la coquille une forme generale tres symetrique. Elle est couverte sur toute sa surface de lignes 

 d'accroissment tres nombreuses et tres marquees ; quelques unes, de distance en distance, le sont davantage. 

 Ces stries sont croisees par d'autres longitudinales ties fines et tres serrees. Localite — Guicben." 



