A MONOGRAPH OF THE EXISTING CRENOIDS 



31 



Syzygies occur between brachials 3+4 and 7 + 8, and distally at intervals of two 

 muscular articulations. 



[Note by A.M.C] This species appears to me notable for the relatively large 

 size of the cirri which are almost equal in proportions to the arms; also since the brachial 

 jomts are only a little oblique the resemblance between cirri and arms is heightened. 

 The cirri are very firmly attached to the centrodorsal and if a break occurs it seems to 

 be between the first and second cutus segments. The niunber of cirri does not neces- 

 sarily increase with size, as can be seen from table 1. 



Table 1. 



-Measurements of li synlypes of Aporometra wilsoni (Bell) 

 in the British Museum (Natural History) 



Localities.- — Port Phillip, Victoria, Australia; J. Bracebridge Wilson [Bell, 1888; 

 P. H. Carpenter, 1890; A. H. Clark, 1911, 1912, 1913] (11, B.M.; 2, M.C.Z.). 



Port Phillip, Victoria [A. H. Clark, 1911] (1, Australian Mus.). 



History.- — This species was originally described in 1888 under the name of Antedon 

 wilsoni by Prof. F. Jeffrey Bell. 



Dr. P. H. Carpenter listed Antedon mlsoni from Port Phillip iu 1890. 



In his memou- on the recent crinoids of Austraha published in 1911 the author said 

 that Antedon mlsoni, so far as he could see, was nothing more than the young of Ptilo- 

 metra miilleri — or possibly of P. macronema. He said further that "A specimen from 

 Port Phillip, Victoria [in the Australian Museum], is certainly referable to 'Antedon 

 wilsoni' and 'Himerometra paedophora' [see page 785] and no less certainly to either 

 Ptilometra miilleri or P. macronema, but which of the two it is impossible to say with 

 accm-acy. The stage represented is somewhat in advance of that described as 'paedo- 

 phora,' more nearly coinciding with 'wilsoni.' " 



In his report upon the crinoids collected by the Hambm-g Southwest Australian 

 Expedition, pubhshed in 1911, the author said that Antedon wilsoni is the young of 

 Ptilometra macronema. In 1912 he placed wilsoni without comment in the synonymy of 

 P. macronema. In his memoir on the crinoids of the British Museum, published in 1913, 

 he listed Bell's original specimens of Antedon wilsoni under Ptilometra macronema. 



In 1938 Dr. H. L. Clark referred Antedon wilsoni to his new genus Aporometra a 

 disposition m which, as stated by Dr. Clark, the author concun-ed. 



