490 



PROCEEDINGS OF THE GEOLOGICAL SOCIETY. [May 20, 



Shale, or upper part of the Pilton group. In the Mus. Pract. 

 Geology. 



Curtonotus centralis, spec. nov. Figs. 4 a, 4 b. 



Transversely oval, rather thick-shelled, convex; the low beak 

 more than one-third from the anterior end. Cardinal tooth direct ; 

 hinge-plate moderately thick. Pallial scar rather near the margin. 



From the Pilton group, N. of Enniskeen, co. Cork. In the Mus. 

 Irish Industry. 



Curtonotus elongatus, Salter. Figs. 5 a-5 d. 



Transversely oval, gibbous from the prominent beak, which is 

 terminal, and overhangs the short oblique anterior end. Hinder 

 margin rounded. Breadth to length as 7 to 13. Surface concentri- 

 cally striate. Hinge-plate triangular, thick, with a large tooth in 

 either valve, and a very small secondary anterior one in the left 

 valve. 



From the Pilton group, Co. Cork. Townland of Leheragh, Dun- 

 worley Bay. Bear Island, Kerry. Old Head of Kinsale. In the 

 Mus. Irish Industry. 



I also subjoin a description of the Serpula from the Upper Old 

 Red Sandstone, above mentioned, p. 476. 



Fig. 6. — Mass of Serpula advena, from the Upper Old Red of Caldy 

 Island, West side (natural size). 



WW'S N> 



Serpula advena, spec. nov. Fig. 6. 



Short wavy cylindrical tubes, one-third of a line wide, and about 

 one inch long, closely aggregated, ascending. The surface is smooth, 

 or, at least, not roughly ridged (a). The state of preservation does not 

 permit me to say whether the surface is quite smooth, or marked with 

 lines of growth. The tubes are filled with solid carbonate of lime, 

 and lie in a red sandy matrix. 



This species occurs 40 feet below the uppermost bed of the Old 

 Red Sandstone, in Sandtap Bay, west of Caldy Island, Pembrokeshire, 

 whence it was collected by me in 1854 ; also in beds of the same 

 age at West Angle, Pembrokeshire. 



