A MONOGRAPH OF THE EXISTING CRINOIDS 319 



stage of his Actinometra jukesii and not a distinct species as he had thought on his 

 somewhat cursory examination of the specimens in the British Museum previous to 

 the publication of the Alert report. 



In the Challenger collection there were two immature specimens from the Aru 

 Islands in which the outer arms on each ray are smaller than the two inner. He had 

 at first considered these as representing a distinct species which he had called in manu- 

 script aruensis, and this name appears on Plate 4 of his report, which was lettered in 

 1882. But he later decided that these simply represent a stage in the development 

 of the individuals younger than that represented by Bell's Actinometra paucicirra. 



In 1894 Bell recorded this species, as Actinometra paucicirra, from northwestern 

 Australia in 8-15 fathoms, and in 1898 Prof. Ludwig Doderlein recorded it under the 

 same name from Thursday Island. 



In 1910 I visited the Paris Museum and there examined Lamarck's original 

 specimens of Comatula rotalaria which I found to have been correctly described by 

 Miiller in 1843, and I also examined the specimens which Carpenter appears to 

 have mistaken for the types. In a paper on some crinoids collected by the Albatross 

 in the Philippines I mentioned that the types of Comatula rotalaria at Paris represent 

 the form called jukesii by Carpenter and paucicirra by Bell, while the species which, 

 following Carpenter, I had hitherto called rotalaria should bear the name parvicirra. 

 This paper was published on February 15, 1911. Later in the same year in a paper 

 on the crinoids of the Paris Museum I stated that Carpenter's jukesii and Bell's 

 paucicirra were, as shown by an examination of the two types, synonyms of Lam- 

 arck's Comatula rotalaria, and toward the end of the year in a monograph of the recent 

 crinoids of Australia I published a detailed synonymy of this species, under the name 

 of Comatula rotalaria, at the same time recording additional specimens from Albany 

 Passage and Port Molle in the collection of the Australian Museum. 



In my account of the crinoids of Australia I described as a new species, Comatula 

 etheridgei, 3 specimens from Holothuria Bank and 1 from Baudin Island in the collec- 

 tion of the British Museum, in which the outer arms arising from each IIBr series 

 are much shorter than the inner. At the time Carpenter's mention of quite similar 

 specimens from the Aru Islands had slipped my mind. My Comatula etheridgei is the 

 equivalent of Carpenter's Actinometra aruensis, and both of these supposed forms are 

 young individuals of Comatula rotalaria. 



In the discussion of the distribution of the Australian crinoids which I published 

 in 1911 in my report on the collection of the Hamburg southwest Australian expedi- 

 tion, Comatula rotalaria and C. etheridgei were treated in detail, and all previous 

 records were cited. 



In my memoir on the crinoids of the Indian Ocean (1912) I again noted the mis- 

 application of the name rotalaria by Carpenter, and mentioned C. etheridgei as a valid 

 species. 



In 1918 I recorded both Comatula (Validia) rotalaria and C. (V.) etheridgei 

 from Siboga station 273 and gave notes on the specimens. I remarked that it is 

 quite possible that the latter is merely the young of the former. 



