CANADIAN FOSSILS. 41 



Dendeocrinus eusticus, Billings. 

 Plate III. Figures la, Ih. 



(D. RUSTious, Report Geological Survey of Canadtty 1856> page 2 "70.) 



Description. — The base of the cup in this species is broad, like that 

 of D. conjugans ; the basal plates about as high as they are wide, the 

 sub-radials one-third higher than the basal plates ; the arm-plates a 

 little shorter than the sub-radials, and broader than high ; the azygos 

 inter-radial is about the size of one of the basal plates, and bears three 

 or four small plates upon its summit ; the column is round at its 

 junction with the basal plates, and composed of thin plates ; but one 

 line and a half below it becomes pentagonal, with raised rounded 

 edges and concave faces ; at the distance of two inches below the 

 base there are about three joints of equal thickness to one line in 

 breadth ; the arms appear to have been short ; breadth of cup, two 

 lines and a half in one specimen and three lines in another ; height 

 of latter to the top of the inter-radial, four lines and a half; the whole 

 surface is smooth. The specimens examined are imperfect, but to 

 each there are about three inches of the column attached. 



Explanation of Figitres. Plate III. 



Figure ta, A specimen very imperfect. 

 " *lh. A small portion of the column, enlarged. 



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



Dendeoceinus conjugans, Billings. 

 Plate IV. Figures la, 15, 2a, 2&. 



(D. CONJUGANS, Report Geological Survey of Canada, 1856, page 268.) 



Description. — In this species the column about one inch below the 

 base is round, smooth, and from half to two-thkds of a line in dia- 

 meter ; proceeding upwards it rapidly enlarges to two or three lines, 

 at the base of the cup, which is small, and not much broader at the 



