BUDLEIGH-SALTERTON PEBBLE-BED. 341 



9. Rhynchonella, sp. (perhaps B. inaurita, Sandb. ?). B. S. Sup., PI. XXXVIII;, 



fig. 21. 



In a fragment of a pebble in the Museum of Practical Geology we find incomplete 

 portions or fragments of a Bliynchonella, the largest of the genus hitherto found at 

 Budleigh-Salterton. It is not sufficiently complete to warrant our arriving at a specific 

 identification. I have, however, thought it as well to figure the specimen for reference 

 sake, and in the hope that more complete examples may be sought for and hereafter 

 correctly identified. 



The shell, when complete, measured about 11 lines in length by 12 in breadth. Fold 

 in the dorsal valve wide and elevated, with sharp lateral slopes and a deep sinus. The 

 valves are ornamented by about twenty-two simple angular ribs, of which four occupy 

 the fold and three the sinus. 



It bears some resemblance to Bh. inaurita, Sandberger, and may, perhaps, be 

 referable to that species or to B. Daleidensis, F. Roemer. 



10. Rhynchonella inaurita, Sandb. (?). Dav., B. S. Sup., PI. XXXVIII, figs. 35, 



35 a, b. 



Rhynchonella inaurita, Sandb. ? Die Brach. Eheinischen Schichtensystems in 



Nassau, p. 41, pi. xxxiii, fig. 5, 1855. 

 — — Dav. Quart. Journ. Geol. Soc, vol. xxvi, p. 80, pi. v, figs. 



1—3, 1869. 



Of this fossil internal casts alone have been found ; they are marginally subtrigonal, 

 wider than long, both valves convex ; dorsal valve gibbous ; mesial fold rising abruptly 

 with greater or lesser breadth, and presenting in profile a regular convex curve. In the 

 ventral valve the sinus is deep and broad, extending from the extremity of the beak to the 

 front ; beak incurved. Surface of each valve ornamented with from sixteen to twenty 

 angular ribs, of which from three to six of the largest occupy the fold, while from two to 

 five furrow the sinus. The ribs on the lateral portions of the valves are narrower. 

 Length 9, breadth 10, depth G lines. 



It is with hesitation I have referred these internal casts to Sandberger's species ; but, 

 having submitted specimens of it to M. de Verneuil in 1863, he at once identified them 

 with B. inaurita. It is a true Devonian fossil, and has been found in the same pebble 

 along with Sp. Verneuilii, Strept. crenistria, Prod. Vicaryi, and Crania transversa. 



45 



