76 FOSSIL CIRRIPEDIA. 
narrower, and a central portion of the mner occludent margin (marked with lines of growth) 
here forms a slightly prominent ridge. In one of the three specimens, the baso-lateral 
portion of the valve was considerably more produced than in the other two. Terga 
(fig. 8, 6), rather broad, considerably convex ; apex pointed, and much curled towards the 
scuta; upper carinal margin unusually arched, slightly longer than the lower carinal margin ; 
there is a deep depression parallel to the occludent margin, which is itself rounded, protube- 
rant, and considerably shorter than the scutal margin. A curved ridge, projecting up above 
the general surface of the valve, with sloping sides, runs from the apex to the basal angle, 
which latter is broad and rounded ; the ridge runs down nearly the middle of the valve. 
Dimensions. Length of longest scutum ‘65 of an inch.’ 
1 20. Potiicipes ELEGANS. ‘Tab. IV, fig. 9. 
P. valvis longitudinaliter et transverse striatis : scutorum margine basalt recto, cum margine occludente 
angulum recto paulo majorem formante ; costd parietali, latiore quam pro solitd incrementorum latitudine, 
ab apice ad angulum baso-lateralem decurrente: tergorum costd parietali, rectd, ad apicem basalem, acumi- 
natum decurrente. : 
Valves longitudinally and transversely striated. Scuta with the basal margin straight, forming an angle 
rather above a rectangle with the occludent margin; a wall-sided ridge, which is broader than the average 
width of the zones of growth, runs from the apex to the baso-lateral angle. Terga with a straight, wall- 
sided ridge running to the pointed basal angle. 
Maestricht Formation, Faxoe, Denmark. Ignaberga, Scania. 
Iam indebted to Professor Steenstrup for an examination of three scuta, a tergum and two carine, 
firmly embedded in the fragmentary coral-rock of Faxoe, and of two very fine scuta from Scania, collected 
by M. Angelin. The valves have each zone of growth raised into a ridge like the roof of a house; the 
interspaces between these ridges are marked by longitudinal striz. Length of largest scutum 1:1 of an inch. 
Seuta (fig. 9, ec), with the apex acuminated, much curved towards the terga; occludent margin either slightly 
or much arched ; forming an angle rather above a right angle with the straight basal margin ; tergo-lateral 
margin slightly (but to a variable degree) hollowed out in upper part, and nearly straight in the lower part, 
where it forms nearly a right angle with the basal margin. Baso-lateral angle generally very broad, 
rounded, almost obliquely truncated. From the apex to this angle a gently curved, broad, wall-sided ridge 
runs, which very perceptibly widens in its downward course ; it is generally wider than the average width of 
each zone of growth. Internally the occludent margin is very wide, flat, and marked with ridges; the pit 
for the adductor muscle is deep. 
Terga (fig. 9, d) broad, rhomboidal, slightly convex; basal angle apparently (for specimen is broken) 
blunt, and obliquely truncated ; upper carinal and occludent margins nearly straight; shorter than lower 
carinal and scutal margins ; valve considerably depressed in a line parallel with the occludent margin, close 
to which the margin itself is convex and arched. The wall-sided ridge which runs from the apex to the 
basal angle is straight, (not quite correctly represented at d), and widens considerably in its downward 
course: it is not so wide proportionally to the whole valve as the ridge on the scuta, for it is here only a 
little above half as wide as the average width of each zone of growth ; it runs at above one third of the width 
of the entire valve from the carinal margin: the plaits cross its summit in a course not exactly corresponding 
with those on the valve on each side of it; probably this ridge projected and formed, as in P. rigidus, the 
basal point of the valve. 
Carina (fig. 9, a, 6) imperfect, elongated, that is, tapering gradually downwards from the apex; some- 
