A MONOGRAPH OF THE EXISTING CRINOIDS 49 



of the subject is outlined. A detailed history of the development of the knowledge 

 of the Australian crinoid fauna is given. The zoogeographic relationships of the 

 Australian coasts are discussed and the past history of the recent crinoid faunas is 

 sketched. 



Keys are given to all the Australian families, genera, and species. 



The family Tropiometridae is restricted to cover the genus Tropiometra only; 

 Ptilometra, Pterometra, and Asierometra are assigned to the Thalassometridae, and a 

 new family, Calometridae, is created for the genus Calometra. The subfamily Chari- 

 tometrinae is raised to family rank. 



The new generic name Solanometra appears; there is no diagnosis, but the geno- 

 type, Antedon antartica P. H. Carpenter, is mentioned. 



Vania, a new specific group in the subgenus Comanthus, is diagnosed with the 

 genotype Alecto parvicirra J. Mtiller. The intent of Vania is identical with that 

 of Validia, which it replaces. The genotype of Validia was given as Comatula 

 rotalaria Lamarck, on the strength of Carpenter's description of Actinometra rotalaria 

 in the Challenger report; but examination of Lamarck's types at Paris showed his 

 rotalaria to be a very different animal from that called rotalaria by Carpenter. 



A new species, Comatula etheridgei, is described from specimens in the British 

 Museum. 



The name Zygometra comata is proposed for the species recorded from Singapore 

 under the name of Z.fluctuaris; examination of the type of fluctuans in the British 

 Museum shows that it is the same as Z. elegans. 



Antedon wilsoni Bell and Ptilometra dorcadis are synonyms of Ptilometra macro- 

 nema; Himerometra paedophora H. L. Clark is a synonym of Pt. miilleri. 



The memoir ends with a list of unidentifiable records, a complete bibliography, 

 and a reprint of Wilton's article describing Encrinus australis from Newcastle, New 

 South Wales. 



On March 19, 1912, two papers appeared. In the first a new genus, Nautna- 

 chocrinus (genotype Naumachocrinus hawaiiensis) , related to Phrynocrinus was 

 described, and hi the second 17 new comatulids of the families Comasteridae and 

 Zygometridae from the collections of the Dutch steamer Siboga were established. 

 These were: 



Capillaster gracillirra. Cornaster sibogae. 



Capillaster tenuicirra. Cornaster pulcher. 



Comissia littoralis. Comantheria weberi. 



Comissia parvula. Comantheria rotula. 



Comissia gracilipes. Comanthus crassicirra. 



Comissia spinosissima. Zygometra jmnctata. 



Comatula tenuicirra. Eudiocrinus junceus. 



Cominia australis. Eudiocrinus pinnatus. 

 Eudiocrinus venustulus. 



A new genus also was proposed, Palaeocomatella (genotype Actinometra difficilis 

 P. H. Carpenter, 1888). 



