56 FOSSIL CIRRIPEDIA. 
7. Potuicipes acuminatus. ‘Tab. III, fig. 6. 
P. scutis elongatis, triangularis ; margine basali cum margine occludente angulum recto 
longé minorem formante ; interna apicis superficie concavd. 
Scuta elongated, triangular; basal margin forming much less than a right angle with 
the occludent margin ; apex, with its internal surface concave. 
White Chalk. Mus. Flower, (believed to have come from the Lower Chalk of Stoke Ferry, Norfolk). 
My materials consist only of a single left-hand scutum, and that with the whole of the 
basal margin broken off; nevertheless, there can be no question that it is quite distinct 
from all the species hitherto described. 
Scutum: shell rather thin, surface extremely smooth; triangular, much elongated, with 
the upper part a little bent over towards the terga: slightly convex, but with the whole 
middle part of the valve remarkably flat; the convexity being caused by the inflec- 
tion, in a slight degree, of the occludent margin, but chiefly of the tergo-lateral portion ; 
hence, a smooth ridge of chief curvature runs from the apex to the baso-lateral angle. 
Occludent margin arched, forming less than a rectangle with the straight basal margin, 
with which the very slightly concave tergo-lateral margin forms an angle rather above a right 
angle : the tergo-lateral portion of the valve, formed by the upturned zones of growth, mode- 
rately wide, being in the upper part about one third of the entire width of the valve : 
rostral angle rounded. Internally (4) the valve is singular ; the depression for the adductor 
scutorum muscle is extremely faint, and is situated unusually low down in the valve, though 
the exact relative position must at present remain unknown, as the basal margin has been 
broken off. But the most unusual character, at least in the cretaceous species of Pollicipes, 
is, that the concavity of the valve runs up to the apex, and must have been lined up to that 
point with corium: the flat internal occludent edge, marked by lines of growth, widens 
very little in the uppermost part. 
8. Potticirprs ancELiIni. Tab. III, fig. 7. 
P. scutis elongatis, triangulis, margine basal prope angulum rostralem in prominentiam 
oblique rotundatam producto: internd apicis superficie prominente, margine occludente 
sulcato. 
Scuta elongated, triangular, with the basal margin near to the rostral angle, produced 
into an obliquely rounded point ; apex with its internal surface prominent, and with the 
occludent edge furrowed. 
Upper Chalk, Norwich. Mus. Fitch. Kjuge, Scania. Mus. Univers. Copenhagen. 
My materials consist of four scuta which, as usual, I take as typical, a pair of terga, 
and one or two carine which, for reasons to be given, perhaps belonged to this species ; all 
