A MONOGRAPH OF THE EXISTING CRINOIDS 109 



with Carpenter's Antedon fluctuans, and on the strength of this identification I stated 

 that I could not agree with Carpenter in considering fluctuans a synonym of elegans. 

 These specimens from Singapore and the Philippines, however, represented in reality 

 Z. comata. 



Later in the same year I recorded a number of specimens from Singapore as 

 Zygomctra fluctuans. I pointed out that these specimens agreed closely with Carpen- 

 ter's description of fluctuans, except that the brachials are oblong distally, and fur- 

 ther that they all agree among themselves and also with Philippine specimens. I 

 said that I had at first followed Carpenter's lead and had considered them as belong- 

 ing to elegans; but when I examined the collections made by the Gazelle in northwest- 

 ern Australia I found that I was wrong, for in that collection there are specimens of 

 what is undoubtedly true elegans that agree with Bell's diagnosis and have much 

 longer and more robust cirri with more numerous segments than any of the Singapore 

 or Philippine specimens. I remarked that, judging from the material at hand, elegans 

 and fluctuans are both perfectly good species, and there is not the slightest difficulty 

 in differentiating them. The form I regarded as fluctuans, however, is in reality Z. 

 comata. 



In 1911 I recorded and gave notes upon a specimen collected by the Hamburg 

 Southwest Australian Expedition presumably in the vicinity of Perth, and in a memoir 

 on the crinoids of Australia published in the same year I recorded specimens in the 

 collection of the Australian Museum from Mast Head Island, Port Denison, Port 

 Molle, and Port Curtis. In a footnote I diagnosed a new species, Zygometra comata 

 (P. H. Carpenter, MS.), to which I referred the specimens from Singapore, the Mergui 

 Archipelago, and the Philippines previously identified by Carpenter as elegans and by 

 myself as fluctuans. Carpenter's Antedon fluctuans I included in the synonymy of 

 Zygometra elegans. 



In a memoir on the crinoids of the Berlin Museum published in 1912 I listed one 

 specimen from Western Australia and four from Mermaid Strait, and in my mono- 

 graph on the crinoids of the Indian Ocean published in the same year I gave the sy- 

 nonymy of the species and a list of the known localities. 



In 1913 I listed and gave notes upon the specimens I had examined in the Brit- 

 ish Museum in 1910. In the same year, in recording specimens of Z. comata from 

 Hongkong, I gave a detailed comparison between this species and Z. elegans. 



In 1914 I recorded and gave notes upon eight specimens dredged by the Australian 

 Fisheries Investigations steamer Endeavour between Fremantle and Geraldton, West- 

 ern Australia, and discussed the relationships between this and the other species of 

 the genus. 



Dr. Hubert Lyman Clark in 1916 recorded and described three specimens dredged 

 by the Endeavour off Sandon Bluffs, New South Wales, the southernmost locality on 

 the east coast of Australia. In the same year Dr. Robert Hartmeyer noted that the 

 specimen from Western Australia that in 1912 I had fisted as in the Berlin Museum 

 was now in the Hamburg Museum, the only specimens in the Berlin Museum being 

 those from Mermaid Strait of which he gave the catalogue number. 



In 1919 Dr. Torsten Gislen described in detail a specimen from Mjoberg's sta- 

 tion 11. He regarded this form simply as a variety of Z. microdiscus. 



