342 BRACHIOPODA OF THE 



1 1. Rhynchonella Thebaulti, Rouault. Dav., B. S. Sup., PI. XXXVIII, figs. 26 — 29. 



Terebratula Tiiebaulti, Bouault. Bull. Soc. Geol. de France, 2nd ser., vol. viii, 



p. 376, 1851.1 

 Ehynchonella, sp. Dav. Quart. Journ. Geol. Soc, vol. xxvi, p. 81, pi. v, figs. 5, 6, 



1869. 



In 18G9 Mr. Vicary forwarded to me two internal casts (figs. 26, 27), but as no 

 external impressions accompanied them I did not venture on a specific identification. 

 Since then two more examples (figs. 28, 29) have been obtained by Major Wyatt-Edgell, 

 and presented by him to the Museum of Practical Geology in London. 



In shape these casts are somewhat subpentagonal, circular, or transversely oval, 

 according to the number of ribs that ornament the mesial fold, but is usually a little 

 wider than long. Dorsal valve convex, and deeper than the ventral one, with a well- 

 marked and elevated mesial fold. Ventral valve with a deepish sinus ; beak small, 

 incurved. Surface of valves covered with about sixteen ribs, of which two, three, or four 

 form the fold, one, two, or three the sinus. In those specimens with two ribs the lateral 

 slopes are wide, a slight longitudinal slit in the umbo of the dorsal valve indicating the 

 existence of a small ridge or septum in the interior of the valve. 

 Length 7, depth 8 lines. 



This is certainly a Devonian fossil, as it occurs in the same pebble along with 

 Spirifera Verneuilii. M. de Tromelin wrote me that it is the T. Thebaulti of Rouault, 

 that he has seen the types, and that it occurs in the " Gres Devonien " at Gahard, in 

 Brittany. I have never seen Rouault's specimens, but his description seems to agree 

 with the shell from the Budleigh-Salterton pebbles. 



12. Rhynchonella elliftica, Schnur (?). Dav., P. S. Sup., PI. XXXVIII, figs. 22—25. 



Rhynchonella elliptica, Schnur, Dav. Quart. Journ. Geol. Soc, vol. xxvi, p. 81, 



pi. v, fig. 4, 1869. 



Shell nearly circular, a little broader than long ; dorsal rather more convex than 

 the ventral valve, with a wide, slightly raised mesial fold, and similarly wide, moderately 



1 " Terebratula Thebaulti, Marie Rouault. Petite espece de forme arrondie, epaisse, couverte de seize 

 plis rayonnants dont deux appartiennent au sinus, et sur les deux valves qui sont tres renflees ; de tout ces 

 plis, celui du milieu arrive du bord jusqu'a lacharniere. Cette espece se distingue du T. bidenta, Murch., 

 de laquelle elle est ties voisine, par sa taille plus petite, la plus grande largeur de son sinus, et le nombre 

 plus grand de ses plis. Localite — Gahard." 



