from the Upper Greensand of Hunstanton. 179 
Perna transversa (Seeley). 
Had this shell occurred in the Oolites there would have been a 
strong temptation to refer it to Myacites. It is transversely ob- 
long, with the two pairs of sides subparallel. The umbo on the 
anterior margin is recurved. ‘The anterior side is short and in- 
flected ; the hinge-line is at right angles with it. The posterior 
side is moderately compressed. The thin shell, which is not 
quite regular in its growth, is only ornamented with regular im- 
bricated lines, which, at distances of about four of these, have a 
tendency to thicken into ridges. Itis 2 inches long, and 1? inch 
deep. 
Avicula cuneata (Seeley). 
A small species, with an anterior ear. Anterior side straight 5 
hinge-line short ; posterior side depressed, lunate; seemingly 
traces of a small posterior ear; base round. Smooth, being 
only marked by faint lines of growth. Length} inch ; width 
rather more than + inch. From the middle the shell narrows 
to the apex. 
Terebratula biplcata (Brocchi, Sow.). 
There probably does not exist in the kingdom such materials 
for the study of this species as may be found in the boxes of 
Messrs. Westmoreland and Hammond, the keepers of the light- 
house at Hunstanton (March 1863). My largest specimen is 2 
inches long and 1? inch wide. 
Kingena lima (Def.). 
The largest specimen is 14 inch long, ? inch wide, and 2 inch 
thick. It shows the pustules well; they are distant and arranged 
in lines of growth. The fossil is not rare, and is perhaps more 
variable than in any other locality. 
Cardiaster suborbicularis (Def.). 
Of this fossil, besides the typical form, two very marked varieties 
occur. 
8. In this the length is 12 inch, and width the same. The 
outline of the side is more orbicular. The apex is nearer the 
middle of the shell, and consequently the anterior sulcus is a 
little longer. The shell is more depressed, and a transverse sec- 
tion 1s a large curve ; so that the sides are more inflated, and there 
is no apical prominence. It much resembles C. granulosus. 
y. The other variety reminds me of Epiaster gibbus. The apex 
is just behind the anterior third of the shell ; and from it the up- 
per surface slopes down in every direction, conically. In trans- 
verse section the sides make more than a right angle and in 
. 12* 
