la. 
1b. 
ive. 
PLATE XI. 
. GLYPTOCRINUS DECADACTYLUS. Vault magnified three diameters. 
The arms have been broken downward and outward, so as to show 
the vault, in its extension over the ambulacral furrows, with the 
first joint of the pinnules on the sides of the furrows and the cov- 
ering of plates between them. The excurrent opening on the vault 
is within the wrinkle below the middle of this specimen, and can 
not, therefore, be seen, 
Fragment of the lower part of an arm, showing the tegumentary plates 
covering the ambulacral furrow between the pinnules, magnified 
six diameters. 
Transverse section of an arm magnified six diameters. It was not made 
from a prepared microscopic section, and may not, therefore, be 
strictly accurate. 
Part of a vault magnified six diameters, and showing the excurrent 
opening located subcentrally, and surrounded by a few spinous 
plates. These specimens are from the collecction of Dr. R. M. 
Byrnes. 
. GAUROCRINUS MAGNIFICUS, n. sp. Natural size. Itis from the collec- 
_ tion of J. Kelly O’Neall, : : : i 
. GAUROCRINUS SPLENDENS, n. sp. Magnified three diameters, 
. Another specimen magnified four and a half diameters, a points to a 
fracture in a plate or a subdivision of one of the third secondary 
radials These specimens are from the author’s collection. 
. COMPSOCRINUS HARRISI. Natural size, ; 
. Diagrammatic view of basalsand first primary 1 radials! This specimen 
is from the collection of I. H. Harris. 
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