BARBADOS-ANTIGUA REPORTS 13 



The following 11 genera occur in the Indo-Paeific region as 

 well as in the West Indies 



Tropiometra Atelecrinus 



Crotalometra Endoxocrinus 



Adelometra Bathycrinus 



Trichometra Monachocrinus 



Pentametrocrinus Democrinus 



Btthocrinus 



This shows graphically the isolation of the crinoid fauna of 

 the Caribbean area. 



The Geological Significance of the West Indian Crinoid Fauna 

 Of the six fossil groups which are represented by recent spe- 

 cies, the Zygometridae, Pentacrinidas, Holopodidae, Apiocrinidae, 

 Bourgueticrinidae and Plicatocrinidas, three, the Pentacrinidas, 

 Holopodidae and Bourgueticrinidae, occur in the West Indian 

 region, and the Plicatocrinidae, inhabiting the abysses and known 

 from off west Africa, probably will eventually be found there. 



The genera occurring in the West Indies which include both 

 recent and fossil species are the following 



Family Pentacrinidse 

 Isocrinus 



Range of the recent species. — ^West Indies. 



Horizons. — Trias and Jurassic ; Europe and North America. 



Family Holopodidae 

 Holopus 



Range of the recent species. — West Indies. 

 Horizon. — Tertiary ; Italy. 



Family Bourgueticrinidae 

 Rhizocrinus 

 Range of the recent species. — West Indies to Massachusetts, 



and northwestern Europe. 

 Horizons. — Cretaceous, New Jersey; Eocene, Europe. 

 Democrinus 



Range of the recent speciss. — Tropical Atlantic and East 



Indies. 

 Horizon. — Recent ; Guadeloupe. 



As in all the rest of the world there are only two genera, 



