180 

 Table II. 



THE CANADIAN NATURALIST. [JuDG 



-Supplementary List of Peculiar Arenaceous lurms. 



(See Figs, i to 4, and Fig. 7.) 



NOTES ON THE STEUCTUEE OF THE CRINOIDEA, 



AND BLASTOIDEA. 



By E. BiLLixGS, F.Gr.S., Paleontologist of Geological Survey of Canada. 



Reprinted from (lie Am. Journal, Sc, and Arts, Vol. L., Septr. ISTO ; and concluded from 



this Journal, N. 6. Vel. 4, pp 42C— 133. 



G. On some points relating to the Structure of 



Pentremites. 



1. 



V 



..Z^r. 



771- 



Fig 1. — Calycine plates of Pentremites, — 1), the basals ; /, one of five 

 forked plates ; d, deltoid plate ; ?, lancet plate ; os, oral spiracle ; s, 

 spiracle. 



Fig. 2. — Caryoeystites testudlnarhis, Hisiuger, — h, basal plates ; r, 

 radials ; m, mouth. 



