12 IOWA STUDIES IN NATURAL HISTORY 



genera and 6 families, are stalked, while 500 species, included in 

 120 genera and 22 families and subfamilies, are of the unstalked 

 comatulid type. 



In the West Indian region there occur 51 species (exclusive of 

 two inadequately described) distributed among 30 genera and 

 16 families and subfamilies; of these 12 species belonging to 8 

 genera and three families are stalked, and 39 species belonging 

 to 22 genera and 12 families and subfamilies are comatulids. 



It will be remembered that Dr. P. H. Carpenter in 1881, after 

 a cursory examination of the *' Blake" comatulids estimated the 

 number of West Indian species as slightly less than 55. 



The families and subfamilies represented in the West Indian 

 region are 



Capillasterinae Perometrinae 



Comactiniinae Zenometrinae 



Colobometridae Bathymetrinae 



Tropiometridae Pentametrocrinidae 



Thalassometridae Atelecrinidae 



Charitometridae Pentacrinidae 



Antedoninae Holopodidae 



Thysanometrinae Bourgueticrinidae 



Of the genera the following 16 are confined to the West Indian 

 region, though all of these, excepting Holopus, are closely related 

 to Indo-Pacifie genera 



Nemaster Horaeometra 



Leptonemaster Crinometra 



COMATONIA HybOMETRA 



COMATILIA CoCCOMETRA 



MlCROCOMATULA ZeNOMETRA 



COMACTINIA HyPALOMETRA 



Analcidometra Holopus 



Stylometra Isocrinus 



The following 3 genera occur also in the eastern Atlantic, but 

 not in the Indo-Pacific region 



Neocomatella Antedon 



Rhizocrinus 



