LOWER HELDERBERG ROCKS. 
125 
COLUMNS OF UNDETERMINED CRINOIDE.HE. 
PLATE III A. 
Fig. 3 & 5. Fragments of columns of different species of crinoids, probably of Mariacrinus. 
Fig. 13. A root and base of the column of a species of Mariacrinus ? probably M. pachy- 
dactylus. 
Fig. 14. Fragment of a column with long node-like joints; its relations unknown. 
PLATE YI. 
Fig. 7, 8, 9 & 10. Fragments of pentagonal columns, bearing nodes at the angles, which 
seem to have been the bases of little branchlets. 
Fig. 11, 12 & 13. Sections of pentagonal columns, showing varying degrees of angularity, 
till in the last one the angles project in wing-like appendages. 
Fig. 14. Fragment of Lower Pentamerus limestone, with pieces of columns of two or more 
species. 
Fig. 15. Section of a pentagonal column, showing marks of longitudinal division at the 
angles. 
CYSTIDEiE OF THE LOWER HELDERBERG GROUP. 
Genus LePOCRINUS*, or LepadOCRIKUS ( Conrad). 
9 
In liis Annual Report for 1840, Mr. Conrad introduced the following 
notice of a new crinoid : 
“ Lepocrinites gebhardii. By this name I introduce a singular fossil found 
“ by Mr. Gebhard. The body is composed of plates of unequal sizes, a 
“ few of which have ambulacra, connecting this fossil with the Echino- 
“ dermata : lower half of the column apparently solid, and traversed 
“ by a pentagonal canal.” 
Figures of the bases of the column of this fossil were given in the Final Report 
of Mr. Vanuxem on the Third Geological District of New-York, 1842 ; and the 
same, with a figure of the entire fossil, was given by Mr. Mather in his Report on 
the Geology of the First District, 1843, page 346, under the name previously 
proposed by Mr. Conrad. 
* The name Lepocrinites was given from the resemblance to the Lepas or Barnacle, Anatifa, and is 
properly Lepadocrinus. It will be noticed that these observations upon the relations of this fossil were 
published five years before the paper of Von Buch on Cystideae. 
