Iia PALEONTOLOGY OF NEW-YORK. 



Associated with this species in the same rock are numerous fragments of large 

 columns, roots, etc., which I have referred to this species, both from their analogy 

 in size, and for the reason that there are no other large columns in the same rock, 

 and indeed scarcely any crinoidal remains beyond these, which are likewise un- 

 known in any of the beds below the Upper Pentamerus limestone. 



PLATE in A. 

 Fig. 1. A specimen showing the base and a portion of the body. 



Fig. 10. A fragment of the column with the rootlets attached. 

 Fig. 11. A fragment of the column with the rootlets worn off. 

 Fig. 12. Another fragment with rootlets attached. 



Fig. 8 & 9 are detached rootlets of the same species, and should be reversed in position 

 upon the plate. 



PLATE ni B. 

 Fig. 1 & 2. Roots and rootlets of the same species. 



Geological position and locality. In the Upper Pentamerus beds of the Lower 

 Helderberg group : Schoharie and the Helderberg. 



Mai'iacrinus stoloniferus (n.s.). 



Plate III A. Fio. 2 ; and Plate III B. Fro. 3-7. 



Body and arms unknown. 



Column round; composed of thin, nearly equal joints, with numerous 

 lateral radicles or branches, proceeding mainly from one side. Articu- 

 lating surfaces finely striated. Canal round, large, often excentric. 



From the general similarity of these columns to others of the Genus Mariacrinus, 

 I have referred them to the same. Their mode of occurrence indicates that they 

 have grown irregularly over the surface; bending according to its inequalities, and 

 sending off, principally upon one side, numerous small rootlets or branches, which 

 are imbedded in the surrounding rock. "Where the column is curved, those stolons 

 are chiefly from the inner side of the curve, and very rarely upon the outer side. 

 Whether we regard the columns in these parts as having grown in an erect or re- 

 cumbent position, the circumstance that these appendages grow only from one side 

 is equally interesting and remarkable; and this is not confined to the large coliunns, 

 but occurs in the smallest individuals observed. The great uniformity in the 

 columns, though; of extremely different size, together with the characteristic ap- 

 pendages, renders the species readily recognizable; for which reasons I have de- 

 signated it, although not knowing the structure of the body. 



