REPORT ON THE CRINOIDEA. 
Family Hyocrinide, and Definition of Hyocrinus, 
A. General Account of the Type, Hyoerinus hethelidannes Wyville Thomson, 
B. On the Systematic Position of Hyocrinus, . : 
Family Bourgueticrinide, 
Definition of genus Bathycrinus, . 
Structure of the Calyx, 
Distribution of the Axial Cords, : 
Trifascial Articulations of the Outer Radials ad Arm- J oints, . 
The Disk, 
Axial Cords of the emis 3 
Comparison of Bathycrinus and Rhizocrinus, 
Bathycrinus campbellianus, n. sp., 
aldrichianus, Wyville Thomson, 
gracilis, Wyville Thomson, 
Definition of Genus Rhizocrinus, 
Characters of Conocrinus, ‘ 
Composition of the Calyx in Rhizocrinus, 
Views of Pourtalés, Sars, and Ludwig, 
Distribution of the Axial Cords, 
Syzygies in the Arms, 
Affinities of Rhizocrinus, ; 
Rhizocrinus lofotensis, M. Sars, 
rauwsoni, Pourtales, : 
Variations in the Shape of the Calyx, . 
The genus Democrinus, Perrier, 
Definition of the family Pentacrinide, 
Synopsis of the Genera, 
Genus Pentacrinus, 
A. Characters of the Genus, 
Characters of Hxtracrinus, 
Cenocrinus and Neocrinus, 
Cainocrinus, 
Variations in the Size of the Basle in Pantie 
Arms of Pentucrinis, 
Characters of the Stem, 
B. On the Characters of Young Pentacrinide, 
C. The Calyx and its Contents, 
D. The Geological History of Pentacrinus, 
Synopsis of the recent Species, 
Pentacrinus asterius, Linn. sp. 
miller’, Oersted, 
maclearanus, Wyville Thomson, 
wyville-thomsoni, Jeffreys, . : 
Termination of the Stem below, and the Mode of Eh ecnmont of ae Den tatriniilie 
Pentacrinus alternicirrus, 1. sp., 
NATesianus, . SP. 
blaket, P. H. Carpenter, 
decorus, Wyville Thomson, 
Variability of its Characters, 
Pentacrinus mollis, n. sp., 
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