File:The Quarterly journal of the Geological Society of London (13860039034).jpg

40 P. H. CARPENTER ON SOME NEW OR
2. Antedon calloviensis, n. sp. Fig. 2.
A.ctinometra calloviensis, P. H. Carpenter, Abstracts of the Pro-
ceedings Geol. Soc. no. 407, June 22, 1881, p. 98.
The centrodorsal is low and basin-shaped, slightly produced at
the interradial angles, and nearly covered by about 30 cirrhus-
sockets. The lowest joint of one (probably mature) cirrhus is still
attached to its socket, and close to it is the basal portion of another,
but much younger one. The first radials are partially visible all
round the edge of the centrodorsal, from which they are separated
at the interradial angles of the calyx by the small basals

their
line of junction with the second radials is rather incurved, though
less so than in the preceding species. The second radials are very
convex, and widely hexagonal, being only united to their fellows by
less than half their length. The axillaries are wide and penta-
gonal, and less than twice the length of the second radials, their
Fig. 2. — Antedon calloviensis, n. sp.
From beneath. B. From the side. (Twice the natural size.)
From the Kelloway rock of Sutton Benger.
proportions being length

width = 10

17. The first brachials are
united in pairs for about half their length by their inner ends, and
their terminal edges are nearly parallel

while the second are some-
what more wedge-shaped, their inner sides being considerably shorter
than the outer ones. The oblong third brachial is usually a syzygial
or double joint, one out of the five which remain being an exception
to this rule. The first joints of the pinnules on the second brachials
are visible at the bases of one or two arms.
Size. Diameter of centrodorsal 6 mm.

diameter across the circle
of radial axillaries 11-5 mm.
Horizon and locality. The Kelloway Kock of Sutton Benger.
Remarks. These two species, occurring at different horizons, are
very closely allied. Ant. calloviensis has fewer cirrhi and a less
spreading centrodorsal, so that the first radials are visible all round,
and not more or less completely concealed as is the case with some
of those of Ant. latiradia. The second radials, too, have their
proximal ends less closely united than in Ant. latiradia.