CANADIAN FOSSILS. 39 



degrees, but in this the divergence is only about 20 degrees, pro- 

 ducing to the eye a very different effect. 



Explanation of Figures. Plate III. 



Figure 3a. Anterior side. 



" 3b. Part of surface of proboscis, enlarged. 

 " 3c. Portion of column, enlarged. 



Locality and formation. — Upper part of the Trenton limestone, near 

 the Toll-gate, St. Lawrence Street, Montreal. 



Dendrocrinus humilis, Billings. 

 Plate III. Figure 4. 



(D. HUMILIS, Report Geological Survey of Canada, 1856, p. 2 '70.) 



Description. — Cup small, conical ; arms, nearly as broad as the first 

 primary radials, divided at the fourth or fifth joints, and again above; 

 the basal plates are small, their height about equal to their width, 

 the sub-radials three times larger than the basal plates ; the first 

 primary radials are low and broad ; column, unknown ; height of cup, 

 two and a half lines, breadth at the margin, the same. 



Explanation of Figures. Plate III. 

 Figure 4. Posterior view of the only specimen discovered. 



Locality and formation. — Trenton limestone, City of Ottawa. 



Dendrocrinus latibrachiatus, Billings. 



Plate III. Figures 5a, 5b, 5c. 



(D. latibrachiatus, Report Geological Survey of Canada, 1856, page 270.) 



Description. — This species is most closely related to D. humilis, the 

 only difference being in the greater breadth and length of the arms, 

 which at the base are quite as wide as the first primary radials, and 

 become a little broader above, whereas in the other species they 

 become narrower from the base upwards. The bottom of the cup is 

 more rounded than in D. humilis, and as the columns of both are 

 unknown and as they occur in different formations, they cannot be 

 easily identified at present ; the arms are three times divided ; length 

 of cup, three lines and a half; of the arms, ten lines. 



