A MONOGEAPH OF THE EXISTING CRINOID S 15 



This paper begins with a key to all the comatulid families, collectively considered 

 as making up the order Comatulida, which have recent representatives. A list of the 

 families with the included genera and the geographical and bathymetrical ranges 

 follows. They are 



Thuamatocrinidae, including Thaumatocrinus. 



Atelecrinidae, including Atelecrinus. 



Eudiocrinidae, including Eudiocrinus and Decametrocrinus. 



Thalassometridae, including Thalassometra, Stylometra, Charitometra, and Poe- 

 cilometra. 



Tropiometridae, including Tropiometra, Ptilometra, Asterometra, and Calometra. 



Antedonidae (restricted), including Antedon, Thysanometra, Coccometra, Heliome- 

 tra, Promachocrinus, Trichometra, Adelometra, Psathyrometra, Zenometra, Hypalo- 

 metra, Isometra, Bathymetra, Thaumatometra, Hathrometra, Leptometra, Compsometra, 

 Iridometra, Nanometra, Erythrometra, and Perometra. 



Himerometridae, including Oligometra, Cyllometra, Himerometra, and Pontiometra. 



Zygometridae, including Zygometra. 



Comasteridae, including Comaster and Comatula. 



Two other fiimilies of Comatulida, both fossil only, are mentioned, the Thiol- 

 liericrinidae and the Uintacrinidae, each containing only a single genus representing 

 respectively the least and most specialized types in the order. 



The species given from the Hawaiian Islands, all but Thalassometra hawaiiensis 

 new, are: 



Atelecrinus conifer. Thalassometra hawaiiensis. 



Decametrocrinus rugosus. Thalassometra gigantea. 



Trichometra vexator. Thalassometra Jisheri. 



Iridometra crispa. Thalassometra crassicirra. 



Zenometra triserialis. Thalassometra delicata. 



Psathyrometra congesta. Charitometra lateralis. 



The Hawaiian fauna is compared in detail with that of the West Indies, Japan, 

 and the Crozet, Aleutian, and Galapagos Islands. It is stated that specimens of 

 species of Comasteridae and Himerometridae have been recorded from, and exist 

 in collections as having been obtained in, the Hawaiian Islands, but that these have 

 probably been brought as "curios" to Honolulu from Japan or Samoa and there sold 

 as having been secured in the Hawaiian Islands. 



Additional species described in an appendix to this paper are : 



Trichometra aspera. Adelometra tenuipes. 



Thaumatometra parva. Psathyrometra borealis. 



Thaumatometra comaster. Psathyrometra profundorum. 



Bathymetra minutissima. Zenometra pyramidalis. 



Bathymetra brevicirra. Himerometra subcarinata. 



Bathymetra carpenteri. Oligometra caribbea. 

 Cyllometra albopurpurea. 



