PART 5 



A MONOGRAPH OF THE EXISTING CRINOIDS 



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 

 joints 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 cirrus segments. The number of cirri does not neces- 

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



TABLE 1. Measurements of 11 syntypes of Aporometra wUsoni (Dell) 

 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 wilsoni from Port Phillip in 1890. 



In his memoir on the recent crinoids of Australia published in 1911 the author said 

 that Antedon wilsoni, 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 

 accuracy. 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 Hamburg Southwest Australian 

 Expedition, published 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 in which, as stated by Dr. Clark, the author concurred. 



