CANADIAN FOSSILS. 43 



Denprocrinus Jewettii, Billings, 



Fig. 15. 

 Figure 15. View of the anterior side of Dendrocrinus Jewettii. 



Description. — Cup, conical, six lines in height ; arms, large, several 

 times sub-divided, broadly rounded or sub-carinate on the back. 

 The plates are all more or less convex, and appear to have a set of 

 obscure radiating ridges arranged as follows: 1st. On each of the 

 basal plates there are two ridges which run from the centre of the 

 plate upwards, and are continued to the centres of the two sub- 

 radials that rest upon its upper sloping sides. 2nd. On each of the 

 sub-radials there are four ridges, two of which are the continuations 

 of the ridges from the basal plates, while the other two run from 

 the centre of the plate upwards, and are continued on the first 

 primary radials to the bases of the arms. The rays consist each of 

 one large joint, included in the cup, and four smaller ones, above 

 which they are divided. The large joint of the left anterior ray 

 is hexagonal ; the same joint in each of the other four rays is 

 pentagonal. The azygos sub-radial is heptagonal, and supports 

 upon its upper side a hexagonal azygos inter-radial, which, in its 

 turn, supports the proboscis. Column, unknown. Height of basal 

 plates, two lines ; width at base of each, one line ; width measured 

 between the two upper lateral angles, one line and a half; height 

 of sub-radials, three lines; width of first primary radial, two lines 

 and a half; height, two lines; the four succeeding joints of the arms 

 are each half a line high. 



This species is allied to D. humilis and D. latihrachiatus, from both 

 of which it differs in having the plates convex and ridged. 



