1863.] 



SALTER UPPER OLD RED SANDSTONE. 



495 



species. A thick low ridge extends from the hinge-plate behind 

 the anterior muscular scar. 



Curtoxotus elegans, Salter. Figs. 3 a, 3 b. Jukes's Manual, 2nd 

 edit. p. 508, fig. 14,/. 



An inch wide, gently convex, regularly oval, not very thick- 

 shelled ; beak small ; nearly overhanging the anterior side ; pallial 

 line near the margin. Surface smooth. Cardinal tooth oblique ; 

 hinge-plate moderate. 



Co. Cork (Pilton group), Dunworley Bay. In the Mus. Irish In- 

 dustry. 



Figs. 3-5. — Shells from the Pilton Growp. 

 3 a 3 6 4a 4 6 



oa 



Curtonotus, three species : — 3 a, 3 b. C. elegans. 4 a, 4 b. C. centralis. 

 5 a-b d. C. elongatus. 



Curtonotus Unto, spec, no v. 



Bound-ovate, not pointed at either end, about 1 inch high and 

 1^ long, gently convex, the beak rather prominent and nearly over- 

 hanging the anterior end. A broad callosity runs vertically from 

 beneath it within the shell. Anterior muscular scar small, but deep ; 

 posterior placed high up, distinct, oval. Pallial border not very near 

 the edge ;. shell thick about the hinge. Cardinal teeth narrow, 

 nearly direct. 



West Angle Bay, W. Pembrokeshire, in the lowest Carboniferous 



