28 BULLETIN 82, UNITED STATES NATIONAL MUSEUM VOLUME 1 



the ambulacral plating of the larger specimens preventing its reference to any species 

 outside of that genus." 



For about 25 years the question of the true systematic position of paedophora 

 remained unsettled, the author maintaining that it is simply a young form of Ptilometra 

 mulleri, and Dr. H. L. Clark insisting that, whatever it is, it certainly is not related 

 to Ptilometra. 



The author at the time of this writing (about 1937) admits that Dr. Clark's con- 

 tention is correct, that paedophora is a species very widely different from Ptilometra. 



Locality. Thetis station 28; off Manning river, New South Wales, Australia; 

 40 meters; fine gray sand; 1898 [H. L. Clark, 1909, 1938, 1946; A. H. Clark, 1911, 

 1912, 1915, 1921; Gislen, 1924] (23, M.C.Z., 376). 



History. This species was described by Dr. H. L. Clark under the name of 

 Himerometra paedophora in 1909. In 1911 it was redescribed and determined as a 

 young form of Ptilometra mulleri by the present author. In subsequent references it 

 was treated as a synonym of Ptilometra mulleri. 



In 1938 Dr. H. L. Clark referred it to his new genus Aporometra, of which he made 

 it the type, a disposition in which, as stated by Dr. Clark, the author concurred. 



APOEOMETEA WILSONI (Bell) 



FIGURE 2 



Antedon wilsoni BELL, Ann. Mag. Nat. Hist., ser. 6, vol. 2, 1888, p. 402 (Port Phillip, Victoria). 

 P. H. CARPENTER, Proc. Roy. Soc. Victoria, new ser., vol. 2, 1890, p. 135 (Port Phillip). A. H. 

 CLARK, Mem. Australian Mus., vol. 4, 1911, p. 718 (young of Ptilometra mulleri), p. 781 (in 

 synonymy of Ptilometra macronema) ; in Michaelsen and Hartmeyer, Die Fauna Siidwest-Aus- 

 traliens, vol. 3, Lief. 13, Crinoidea, 1911, p. 462 (identity); Crinoids of the Indian Ocean, 1912, 

 p. 189 (in synonymy of Ptilometra macronema); Smithsonian Misc. Coll., vol. 61, No. 15, 1913, 

 p. 42 (in synonymy of Plilometra macronema). H. L. CLARK, Biol. Results. Fishing Exper. F.I.S. 

 Endeavour, 1909-14, vol. 4, pt. 1, 1916, p. 24 (possible that this is the same as Himerometra 

 paedophora; perfectly sure the latter is not a Ptilometra and has no near relationship with that 

 genus); Mem. Mus. Comp. Zool., vol. 55, 1938, p. 42 (discussion; identity). 



Nanometra wilsoni A. H. CLARK, Smithsonian Misc. Coll., vol. 50, pt. 3, 1907, p. 349 (listed). 



Ptilometra macronema (part) A. H. CLARK, Mem. Australian Mus., vol. 4, 1911, p. 781 (Antedon 

 wilsoni in synonymy) ; in Michaelsen and Hartmeyer, Die Fauna Siidwest-Australiens, vol. 3, 

 Lief. 13, Crinoidea, 1911, p. 462 (Antedon wilsoni a synonym); Crinoids of the Indian Ocean, 

 1912, p. 189 (same); Smithsonian Misc. Coll., vol. 61, No. 15, 1913, p. 42 (record of Bell's types 

 of Antedon wilsoni). 



Ptilometra mulleri (part) A. H. CLARK, Mem. Australian Mus., vol. 4, 1911, p. 785 (Port Phillip), 

 p. 786 (description of the specimen). 



Aporometra wilsoni H. L. CLARK, Mem. Mus. Comp. Zool., vol. 55, 1938, p. 42 (in key); Echinoderm 

 fauna of Australia, 1946, p. 58 (in key), p. 59 (still known from single record at Port Phillip, 

 Victoria of Bell, 1888). 



Diagnostic features. The longest cirrus segments are distinctly longer than broad 

 and may be just over half as long again as broad. The arms are up to at least 30 mm. 

 in length and the cirri, which are X-XX, with up to 47 segments, are only a little 

 shorter than the arms, up to 25 mm. long. 



Description [modified by A.M.C.]. The centrodorsal is discoidal, with the broad 

 dorsal pole flat or slightly convex. The cirrus sockets are arranged approximately in 

 ten columns of one or two each, there being two columns in each radial area. The 



