A MONOGRAPH OF THE EXISTING CRINOIDS 53 



On June 30 a revision of the family Mariametridae was published in which the 

 family Pontiometridae was suppressed, and the following genera were recognized: 



Pontiometra (genotype Antedon andersoni P. H. Carpenter, 1889). 



Oxymetra (genotype Antedon erinacea Hartlaub, 1890). 



Liparometra, gen. nov. (genotype Himerometra grandis A. H. Clark, 1908). 



Lamprometra, gen. nov. (genotype Antedon imparipinna P. H. Carpenter, 1882). 



Dichrometra (genotype Alecto flagellata J. Miiller, 1841). 



Mariamefra (genotype Himerometra subcarinata A. H. Clark, 1908). 



The bathymetrical and geographical range of each genus is given, together with 

 a list of the included species. The family is redefined, and a key to the genera is 

 included. 



In a paper published in July the relationships between the recent crinoids and 

 theii- environment and between the recent and the fossil species were considered in 

 great detail, particular attention being paid to the stalked forms. Hyocrinus, 

 Thalassocrinus, Gephyrocrinus, Calamocrinus, and Ptilocrinus, together with Tetra- 

 crinus and Plicatocrinus, were placed in the Hyocrinidae, and Proisocrinus and 

 Carpenterocrinus were considered as equivalent to certain forms in the comprehensive 

 genus Millericrinus. 



A very detailed revision of the genus Himerometra appeared on November 25. 



Dr. Charles R. Eastman was preparing a new edition of the Zittel-Eastman 

 "Paleontology," and he requested Mr. Frank Springer and the author to write the 

 section deahng with the crinoids. The classification of the recent crinoids had been 

 buUt up on the basis of the recent forms alone, quite regardless of their fossil rela- 

 tives, and it thus became necessary to harmonize the treatment of the two sections 

 of the group, which proved to be a matter of no little difficulty. 



All the recent types were assigned to the order Articulata, which was redefined, 

 and the following famiUes, each considered in detail and redefined, were accepted: 



1. Bourgueticrinidae (including Bourgueticrinus, Mesocrinus, (?)Dolichocrinus, 

 Rhizocrinus, Bythocrinus, Democrinus, Bathycrinus, and Monachocrinus) . 



2. Phrynocrinidae (including Phrynocrinus and Naumackocrinus) . 



3. Apiocrinidae (including Apiocrinus, Millericrinus, Guettardicrinus, Dado- 

 crinus, Hohcrinus, Achrochordocrinus, Proisocrinus, and Carpenterocrinus). 



4. Pentacrinidae: 



Section A : Pentacrinids {Pentacrinus, Isocrinus, Balanocrinus, Austino- 

 crinus, Cenocrinus, Endoxocrinus, Metacrinus, Hypalocrinus, and 

 Comastrocrinus ) . 

 Section B: Thiolliericrinids (Thiolliericrinus). 

 Section C: Comatulids— 

 Tribe 1 : Innatantes — 



Subtribe A: Marsupitids {Marsupites) . 

 Subtribe B: Uintacrinids {Uintacrinus) . 

 Tribe 2: Oligophreata. 

 Tribe 3: Macrophreata. 



5. Piicatocrinidae (including Plicatocrinus, Hyocrinus, Gephyrocrinus, Thalas- 

 socrinus, Ptilocrinus, and Calamocrinus). 



