4 
VICTORIA MEMORIAL MUSEUM. BULLETIN NO. I 
The proximal brachials continue more markedly the tapering 
observed in some of the radials, the only exception being r. post. 
IBri, which interlocks with the anals. The bases of the first 
primibrachs are as wide as the tops of the superradials, but the 
line of union is very clearly marked, and in the three anterior 
rays is emphasized by a slight dislocation, especially visible in 
r. ant. ray. 
The heights of the IBr. in 1. ant. ray are (1) 1*1 mm., (2) 1*1 
mm., (3) 1*0 mm. In section these proximal brachials are sub- 
cylindrical with a wide V-shaped ventral groove. 
Arms non-pinnulate, regularly dichotomous. This is shown 
in the isolated arm-fragment and in one of the fragments 
in the shale. The position of the first axillare is uncertain, but 
it cannot be more proximal than IBr 4 . How many times the 
arms forked is unknown; but the relative size of the isolated 
arm-fragment shows that its axillare is not a primaxil, so that 
there were at least two bifurcations. Each axillare widens 
gently towards its distal end, and the brachials immediately 
succeeding it abut by their inner sides. The general character 
of arm-branching is that of Heterocrinus. No features can be 
detected on the joint-faces of any of the brachials. 
Cover- plates cannot be seen very clearly; but there appear 
to be some preserved, though somewhat pressed into the ventral 
groove, in the bifurcating portion of arm comprised in the shale- 
fragment (Plate I, fig. 5.) There are about three pairs to every 
two brachials. They alternate, and there seems to be a slight 
imbrication suggesting that their free or admedian ends are 
directed towards the proximal end of the arm. 
Anal Structures (Plate I, figs. 1, 2, 3, 5). The proximal 
anal plate ( x ) rests on the narrow top of post. B, the suture being 
about 1 mm. long and curved downwards. The lower right side 
of x rests on the upper shoulder of RA, and its upper right side 
abuts on r. post. R [Rs]. The left side of x bears a similar relation 
to the lower and upper halves of 1. post. R, but is continuous in 
a straight line. Above, x supports two anal plates ( rt . and It.) 
of which that on the right is the wider, at least so far as can be 
seen, and is united to it by a suture 1 * 2 mm. long, with a slight 
downward curve. Anal x } therefore, though abutting on seven 
plates, is to all appearance six-sided. 
