REPORT ON THE CRINOIDEA. 339 
The second and third radials appear to be united by syzygy. The former are slightly 
trapezoidal in shape, meeting one another more or less extensively by their lower angles 
and then diverging. The axillaries are pentagonal, and scarcely wider than the second 
radials, so that a considerable gap is left between the rays. This, however, is much wider 
on the front of the calyx than elsewhere, as will be evident from a comparison of 
figs. 9 and 10 on Pl. XXXIII. It is closed higher up by the approximation of the 
first brachials of adjacent rays. Where they are properly visible they appear to have 
the usual somewhat wedge-shaped form; and the next joint was perhaps an axillary. 
But the condition of the specimen renders the determination of the real nature of the 
lower arm-joints entirely uncertain. From the mode of division of the ambulacra of the 
disk, however, it would appear that there were twenty arms (Pl. XXXIIL. fig. 7). 
The colour is dirty brown with occasional patches of white, indicating the presence of 
calcareous tissue. 
Locality.—Station 235, June 4, 1875; lat. 34° 7’ N., long. 138° 0’ E.; 565 fathoms; 
green mud ; bottom temperature, 38°°1 F. One mutilated specimen. 
Three much mutilated individuals of Hudiocrinus japonicus were obtained at the 
same Station; but they exhibit no trace of the extraordinary deficiency of limestone in 
the skeleton which distinguishes Pentacrinus mollis. The height of the basals and the 
peculiar way in which they are received into a sort of cup formed by the uppermost 
stem-joints distinguish this type very markedly from all the other Pentacrinide. For 
the stem-joints of this family usually decrease rapidly in size towards the top of the 
stem, the upper ones being concealed within the concavity formed by the lower faces of 
the basals, as is well shown in P]. XX XIII. fig. 5. But it is of course possible that this 
may also be the case even in the doubtful Pentacrinus mollis, though on a smaller scale. 
Genus Metacrinus, n. gen. 
Characters of the Genus. 
The petaloid sectors of the faces of the stem-joints are bordered by a few large ridges, 
of which the smaller proximal ones meet those of adjacent sectors in the interpetaloid 
spaces, while the larger distal ridges reach the outer edge of the joint. The internodes 
of six to thirteen joints. Nodals fully occupied by the cirrus-sockets which reach their 
upper edge ; supra-nodals incised to receive the bases of the upturned cirri. These are 
long, consisting of forty or fifty uniform joints, and vary but little in appearance. The 
lower cirri often smaller than those about the twelfth node. 
Basals large, rhomboidal, or hexagonal, and in close contact. Their lower angles are 
generally distinctly produced downwards. Four to six radials, the second a syzygy and 
bearing a pinnule, as do the remaining ones till just before the palmar axillary. The 
