234 Cincinnati Society of Natural History. 



63-6, the larger plates of the column which give it that banded ap- 

 pearance, or make it resemble a string of small spools, graduall}^ di- 

 minish and before the column terminates it becomes as smooth as a 

 silken thread. 



It has long been a question whether or not an}^ species in the genus 

 Glyptocrinus was possessed of a base or roots, or whether, on the 

 other hand, they were free in their habits. And this is the first in- 

 stance where any positive information has been furnished on the sub- 

 ject. AYe now know that at least one species in this genus was free in 

 its habits, floated or drifted in the waters of the ocean, and attached 

 itself, temporaril}^ b}^ means of its remarkabh' flexible and tapering 

 column. 



The specimens illustrated are in my collection, and were found in 

 the Hudson River Group, at Cincinnati, at an elevation of about 360 

 feet above low-water mark. 



Glyptocrinus baeri (Meek). 



Plate VII., fig. 3, view of the plates which cover the top of the calj-x. 

 The specimen illustrated is from the collection of I. H. Harris, Esq., 

 of Waynesville, Ohio. It was found in the upper part of the Hudson 

 River Group near that place. The plates are thin, angular and nu- 

 merous, and each one is possessed of a little conical central elevation. 



LiCHENOCRIXCS DUBIUS, U. Sp. 



Plate VII., fig. 4, view of the column and part of the head, natural size; fig. in, 



magnified view. 



The liead is robust and covered with conical elevations. The 

 plates are more numerous than in L. crateriformis, and the}^ are 

 thrown into elevations and depressions on the surface, which, if not 

 abnormal, will alone distinguish this from all other species. 



The column, in comparison with that of L. crateriformis, is short 

 and thick. For a distance of one inch from the head, the column is 

 fluted-pentagonal, the depressions being at the point of union of the 

 interlocking pieces. At the distance of an inch from the head the 

 column is abruptl}^ contracted and changed to a plain pentagonal form. 

 From this point the column gradually tapers and chang'es from the 

 pentagonal to circular form, so that at the distance of one and one 

 fourth inches from the head the column is round and smooth. Our 

 specimen shows but little of the circular part of the column, but we 

 may fairh' infer from the tapering character of the column that the 

 total length did not much exceed one and a half inches. 



I collected this specimen about five years ago in the lower part of 



