REPORT ON THE CRINOIDEA. 345 
1. Metacrinus angulatus, n. sp. (Pls. XXXVIIL., XXXIX.). 
Dimensions. 
Greatest length of stem, terminating at the thirty-fifth node, : . 38°50 cm. 
Diameter of stem, . ‘ é é i : , 5:75 mm. 
Longest cirrus (fifty-seven eae ¢ ; ; : d PAD BHOIU) vip 
Diameter of calyx, . 5 ; 5 : : ; : 8:25 ,, 
Diameter of disk, . é , : : Sy) ADA 
Length of arm (one hundred and ei penta : ; : 28 90:00, 
Length of large distichal pinnule (twenty joints), . : 3 4) :25:0003 
Length of first pinnule after tertiary axillary (twelve joints), : 5 AOHOOD. 5, 
Stem robust, with a sharply pentagonal outline. Hight to twelve internodal joints 
with but slightly crenulated edges. Their faces are distinctly stellate, while the angles 
are sharpened and slightly produced outwards ; and their sides bear strong horizontal 
ridges, the edges of which are coarsely denticulate. Nodal joints more distinctly stellate 
in outline and without horizontal ridges. The cirrus-facets reach closer to their upper 
than to their lower edges, while the supra-nodal joints are slightly incised to receive the 
bases of the large cirri, which are mostly directed upwards, and are longest at the twelfth 
node. They usually consist of forty-five to fifty-five stout joints, which are very uniform 
in appearance except at the two ends. The lower joints are quite short, and the distal 
edges are longer than the proximal ones, so that the joints seem to have slight dorsal 
projections at their distal ends. The interarticular pores terminate between the tenth 
and twelfth nodes. 
Basals widely hexagonal, united into a complete ring, and rather prominent on the 
exterior of the calyx. They are much higher in the middle line than at the lateral edges, 
and the lower angle is often produced considerably downwards over the upper stem- 
joints. Four radials, the first comparatively short and the second a syzygy with a 
pinnule on the epizygal, the third also bearing a pinnule and the last axillary. Rarely 
more than three divisions of the rays, which are in close apposition, being only separated 
by the bases of the large lower pinnules. Forty to fifty arms, generally consisting of about 
one hundred slightly overlapping joints beyond the last axillary. Primary arms of six 
to ten distichals (usually eight or nine), of which the second or third is a syzygy. 
Secondary arms of ten to fourteen palmars, sometimes as many as twenty, the third of 
which is usually a syzygy. ‘Tertiary arms rare; consisting when present of fourteen to 
thirty joints, the third of which is a syzygy. There is generally a syzygy in the third 
brachial of the free arm. Another somewhere between the tenth and thirtieth brachials, 
and others at intervals of six to twelve joints. 
A pinnule on the epizygal of the second radial, and on the first joint after each 
axillary. The first pinnules, as far as the beginning of the secondary arms, are much 
larger than their successors, consisting of about twenty joints, the lowest of which are 
(ZOOL. CHALL, EXP,—PART xxxu.—1884.) Ti 44 
