DESCRIPTION OF THE FOSSILS. 
211 
P. elongatus. (Cardium Sow.) PL V. fig. 28. Bolland. 
Very much elongated transversely ; anterior side conical, middle of the valves 
gibbous, fine radiating striae. 
P. armatus. Ph. PI. Y. fig. 29. Kildare. 
Anteriorly gibbous and subtruncate ; posteriorly elongate ; the rostrum very long 
and slender. 
P. trigonalis. Ph. PL V. fig. 30, 31, 32. Bolland. 
Horse-hoof shaped; posterior part less produced than in P. hibernicus. Surface 
striated from the beaks. 
P. aliformis. Sow. I have found some difficulty in identifying this 
species. The lower figure of Min. Conch, t. 552, appears to be P. minax. 
CONCHIFERA MESOMYONA. 
Pinna inflata. Ph. Pl. VI. fig. 1. Bolland. 
Conical, inflated, with longitudinal equal small furrows. The figure is reduced. 
P. costata. Ph. PL VI. fig. 2. Moulton ; Bolland ; Derbyshire. 
Elongated ; the middle of the valves ornamented with deep longitudinal smooth 
furrows. The figure is reduced. This is probably the species figured by Martin under 
the names of Pinna flabelliformis and P. nuda. 
Inoceuamus vetustus. Sow. PL VI. fig. 3, 4. Castleton ; Bolland ; 
Flashy ; Todmorden ; Kulkeagh ; Clare ; Kildare. 
Ovate, smooth, front round, concentrically undulated ; upper valve (fig. 4) flatfish, 
lower valve very convex (fig. 3). It probably does not belong to Inoceramus (Sow.) 
but to Posidonia. (Bronn.) 
Avicula cycloptera. Ph. Pl. VI. fig. 5. Bolland. 
Hinge line extended, bent at the beak ; front round ; a few broad radiating ridges 
on the middle of the valves, lines of growth imbricated. 
A. tessellata. Ph. Pl. VI. fig. 6. Bolland ; Colsterdale. 
Hinge line extended, straight ; front round ; about fifteen radiating ridges. 
A. radiata. Ph. PL VI. fig. 8. Bolland. 
Hinge line extended, straight ; front round ; ears acute ; many radiating small 
furrows and ridges. 
A. sublobata. Ph. Pl. VI. fig. 25. Castleton. 
Oblique oval, a small lobe on one side ; radiating narrow flat bands, and neat 
concentric striae, (the upper valve not known.) 
Gervillia lunulata. Ph. Pl. VI. fig. 12. Colsterdale ; Bolland ; Isle 
of Man ; Kildare, kc. ; Hawes. 
