44 CANADIAN FOSSILS. 



It was discovered by Col. E. Jewett, of Utica, N. Y., and by him 

 kindly communicated to us for description. Through the researches 

 of this gentleman our knowledge of the Silurian fauna of North 

 America has been greatly extended. Many of the most rare and 

 interesting fossils figured in Hall's Palaeontology of New York are 

 his discoveries ; and it gives me much pleasure to dedicate this new 

 crinoid to him. 



Locality and formation. — Bay of Qumte, Trenton limestone. 



Dendrocrinus ctlindricus, Billings. 

 Plate III. Figures, 8a, 86. 



Descriptio?i. — Cup, small, two lines and a half in height, and about 

 the same in width at the margin ; arms, cylindrical, one line in width 

 at the base, divided above the third free joint ; length of the undi- 

 vided portion, two and a half lines, each one of the three free joints 

 being nearly one line in length. The proboscis is large, equal to 

 the arms in height, and composed on the anterior side of large plates, 

 the first, second, third and fourth of which are each rather more than 

 one line in length. All the plates are smooth. The column is 

 round, smooth, and composed of very thin joints, which however 

 vary a little in thickness, ten in the length of one line. Length of 

 body and arms, one inch and one-fourth. 



The above description of the column of this species refers to the 

 upper portion only. It seems probable that in the lower part it is 

 composed of thick, rounded joints, as I find a fragment of a column 

 of this latter character on the same piece of stone in which the 

 crinoid is imbedded. 



Explanation of Figubbs. Plate III. 



Figure 8a. Anterior side of D. cylindricus. That which appears to be a large 

 arm near the left side is the proboscis. 

 " 86. Part of the column, a little enlarged. 



Locality and formation. — ^Near the Toll-gate, St. Lawrence Street, 

 Montreal ; Trenton limestone. 



