Bd. VI: 8) 
THE CRINOIDEA. 
3 
Cirri XXX — XL, 40 — 60, stout and rather long, the longest ca. 45 mm. The 
joints are of uniform length, short, rounded, the basal ones distinctly thicker than the 
following; the outer half of the cirrus is distinctly serrate, the serrations gradually 
disappearing in the proximal half, as may be seen in PL I fig. 2. The prominences 
of the joints are smooth, rounded (fig. 1). The terminal claw is not very prominent; 
the opposing spine short, nearly erect. The cirri along the ventral edge of the centro- 
dorsal are mostly turned upwards between the arms, leaning over the disk; those 
nearer the dorsal pole are generally directed backwards in a tuft (PI. I. figs. 1 — 2). 
Above each interradial prominence of the centrodorsal, in the corner between this 
prominence and the radiais, is seen a small triangular plate (PI. II. fig. 1). These 
Fig. I. Distal part of a cirrus of Notocrinus 
virilis. 4 /i. 1 
Fig. 2. Dorsal view of armjoints of Notocrimis 
virilis; a. from the middle, b. from the distal part 
of the arm. a. 8 /r, b. xt /i. 
small plates, doubtless, represent the basalia, which are thus persistent, not concealed 
within the calyx. (See below, p. 8). 
The radiais (PI. II, Fig. i) are very well developed, not at all concealed by the 
centrodorsal; they are convex dorsally, corresponding to the notches in the ventral 
edge of the centrodorsal. The ventral edge is correspondingly concave, the plate being 
thus bow-shaped. There is no process from the dorsal side of the radiais to enter 
the deep radial pits of the centrodorsal. The costals, which have much the same 
shape as the radiais, only more concave ventrally, are not in apposition laterally. 
The axillary is slightly broader than long. The shape of the primibrachs and the 
lower brachials is seen in PI. II, Fig. I, that of the brachials farther out on the arm 
1 In the preliminary notice this figure is stated to represent the distal end of a »pinnule«; this is, of 
course, a lapsus calami for cirrus. 
