118 FIFTEENTH REPORT ON THE CABINET OF NAT. HISTORY. 



summit of the column. The column is round in its lower part, 

 sometimes becoming quadrangular above, and is unequal in its 

 dimensions. 



These bodies seem to have been the base, and indicate the exis- 

 tence of a free floating crinoid, with the thickened bulb below 

 serving as a balance for the column and body above. The articula- 

 ting scar on the lower extremity of the smaller ones indicates that 

 the animal was fixed in its young state. 



For these bodies and their appendages, a designation is required j and 

 I have chosen that of Ancyrocrinus, indicating the anchor-like appendage 

 of the column. 



A^^CYROCRINUS BULBOSUS ( n. s.)- I "( ^ > ^^' ^ ^ 



BuLBiFORM below, with four lateral, obliquely ascending processes 

 of the character of jointed or solid spines, which are more or less 

 thickened according to age. Column above the bulb often elonga- 

 ted, rounded in the lower part and obtusely quadrangular above 

 in older specimens, which preserve but a small part of the column 

 as a thickened process. Body and arms unknown. 

 The figure is from a specimen in the State Collection, which preserves 



about seven inches of the column above the bulb. The lateral processes 



are restored from another specimen. 

 Geological position and locality. In the shales of the Hamilton group : 



Lake Erie shore, and elsewhere. 



