REPORT ON THE CRINOIDEA. 349 
are united by syzygy. The third radial therefore, being a hypozygal, bears no pinnule. 
But the normal number of pinnules, one on each side of the ray, is still maintained ; for 
the second radial, itself a syzygial joint, bears a pinnule on each side. 
The stem of this specimen, which is broken at the bottom, tapers slightly downwards, 
and has tolerably regular internodes, with five cirri at each node in the usual way. 
The stem of the other individual, however, does not decrease in size at its lower end, 
which terminates in a nodal joint with a freshly exposed under surface. The inter- 
nodes of this stem are very irregular in length, and generally consist of one or two joints 
more than in the smaller specimen, while the development of cirri at the nodes is 
extremely irregular. No less than ten of the thirty-three remaining nodes have one or 
more cirri deficient, as shown in the following Table :— 
Node. Missing Cirri. Node. Missing Cirri. 
5th 2 20th 2 
8th 1 24th 2 
9th 3 27th 4 
10th 1 30th 4 
13th 1 33rd 2 
In the lower part of the stem there is no trace of the absent sockets, which are replaced 
by ridges like those on the internodal joints; but in the middle and upper parts the 
socket is present, though imperfectly developed, especially at the fifth node. At the 
thirteenth, the place of the socket is entirely taken up by a group of sessile Cirripedes 
(Verruca). 
Metacrinus murray?, n. sp. (Pl. XLI. figs. 12-17; Pl. XLIL.). 
Dimensions. 
Length of stem to eighteenth node, é 6 % - . 184:00 mm. 
Diameter of stem, . ; ; : 0 : : 615), 
Longest cirrus (forty-eight rome ‘ : j c : ~ 43008 Fs 
Diameter of calyx, . ; . : : : : Jan LHIOOM, 
Diameter of disk, . : oy apa O0. 
Length of arm (one hundred and fifteen pone above pane eallar) a LOO:00R: 
Length of pinnule on second radial (fifteen joints), . : : ne LCROOR rs 
Length of first palmar pinnule (seventeen joints), : 2 23:00, 
Length of first pinnule after tertiary axillary (steven Some) : et OOS 
Description of an Individual.—Stem robust and of a rounded pentagonal form, with 
very shallow re-entering angles. Internodes composed of thirteen joints, with smooth 
sides and faintly crenulated edges. The supra-nodal joints are slightly incised, but the 
