vm 



THE VOYAGE OF H.M.S. CHALLENGEE. 



VII. — On tub Habits op recent Crinoids, and their Parasites, 



Modes of Attachment, ...... 



Myzostoma, ....... 



VIII. — The Geographical and Bathymetrical Distribution ov the Crinoids, 



A. Geographical Eange, ...... 



B. Bathymetrical Eauge, ...... 



C. The Association of the Genera at Particular Stations, . 



IX. — On the Eelation between the Eecbnt and the Fossil Neocrinoids, 



X. — On the Eelations of the Neocrinoids to the Pal/Eochinoids, 

 The Mullerian Classification ; Articiilata and Tessellata 

 General Characters of the Neocrinoids, 



Structure of the Calyx, 



Characters of the Arms, 



The Disk and Oral Plates, 



The Vault of the PaliEocrinoids, 

 Vault of Haplocrinm, AUaQeainus, and Cocrocrinn. 

 Vault of Cyathocrinns, 



Subtegminal Ambulacra, 

 Vault of Actinocrinida3, 



Homologies of the Calyx and Dome Plates, 



Eadial Dome Plates, . 

 Vault of Platyorinidse, 

 Vault of Ichthyocrinidse, . 

 Vault of Glyptocrintis, Reteocrinas, and Xenocrinus. 



XI. — Classification, .... 



Definition of the Pelmatozoa, 



Definition of the Crinoidea, 



Other Systems of Classification, 

 Characters of the Pelmatozoa, 



Definition of the Neocriuoidea, 



XII. — Description of the Specimens, 



Family Holopidas and Genus Holopus, 



A. General Account of the Type, 



Holopus rangi, d'Orbigny, 



The Calyx, 



The Axillary Eadials, . 



The Arms, 



The Disk and Ambulacra, 



Anatomy of the Arms, . 



B. On the Systematic Position of Holopus, 



Cyathidium, . 



Cofylecrinus, . 



Eiidesicrinus, . 



Gymnocrinus and Micropocriniis, 



Edriocrinus, 



p.\oe 

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