Bd. VI: 8) 



THE CRINOIDEA. 



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. i). 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 betw^een the arms, leaning over the disk; those 

 nearer the dorsal pole are generally directed backwards in a tuft (PI. I. figs, i —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. i). These 



Fig. 



Distal part of a cirrus of IVotücriniis 

 virilis. v.. ' 



a. b. 



Fig. 2. Dorsal view of armjoints of Notocrinus 

 virilis: a. from the middle, b. from the distal part 

 of the arm. a. ','■, b. "A- 



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 vcntrally, 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 



' 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. 



