Glyptocrinus Redefined and Restricted, etc. 223 
“ Give off alternately on each side small divisions, that do not be- 
come free, but are soldered into the interradial walls, though they can 
_ be traced to the summit of the body, where they merely give origin to 
pinnules.” 
This was a mistake. 
Quite a strong ridge arises from the second secondary radial, and 
passes upward across the interradial plates, gradually diminishing in 
size and disappearing at the plates of the vault; a similar, smaller 
ridge arises from the fourth secondary radial, and passes upward across 
the interradial area. These ridges appear to have been supports to 
the interradial areas, as the central ridge in the wider azygous area 
seems to have been a support to it, but they are not soldered into the 
interradial walls any more than the ridges that ornament the surface 
of the plates, and produce the sculptured appearance of the calyx are 
soldered to the walls; nor do they support arms, or pinnules. The 
azygous areas in the two species are similar, and the arms in this one 
are a little more delicate than in G. decadactylus. ‘The two species 
agree in the general characters of the column, basals, primary radials, 
and number of arms; but differ materially in the region of the secon- 
dary radials, though the number of secondary radials and tertiaries, 
forming part of the calyx in G. decadactylus, will nearly correspond 
with the number of secondary radials, forming part of the calyx in 
G. dyeri. 
It occurs in the midle part of the Hudson River Group, above G. 
decadactylus. 
GLYPTOCRINUS SUBGLOBosuUS (Meek). 
G. subglobosus was described by Prof. Meek as a variety only of 
G. dyeri, with which it agrees in the most essential parts of its structure, 
but, as so many specimens have been collected, and they are so easily 
recognized, I think it should rank as a species. 
It is distinguished by having proportionally a larger column, and 
proportionally larger, though not longer, arms, which are also more 
divaricating or spreading. The interradial areas are more depressed, 
and the calyx more pentagonal in outline. The longitudinal ridge or 
support in the middle of the azygous interradial area is stronger, and 
, extends higher up toward the vault, accompanied by the proportionally 
larger size of the plates. 
it occurs in the central part of the Hudson River Group. 
