24 BULLETIN 82, UNITED STATEiS NATIONAL MUSEUM VOLUME 1 



KEY TO THE SPECIES OF APOROMETRA 



a 1 . Longest cirrus segments up to half again as long as broad (Port Phillip, Victoria). 



wilsoni (p. 28) 

 a 2 . Longest cirrus segments not longer than broad. 



6'. Cirri with 25-35 (usually 28-30) segments, of which most are about as long as broad (New South 



Wales; 40 meters) paedophora (p. 24) 



b 2 . Cirri with 39-61 (usually 40-50) segments, of which the longest are from half again to twice as 

 broad as long (Koombana Bay to Fremantle, Western Australia; 9-18 meters). 



occidentalis (p. 32) 



APOBOMETRA PAEDOPHOEA (H. L. Clark) 



[see vol. 1, pt. 2, fig. 939 (p. 549), and pi. 37, figs. 1228-1230] 



Himeromelra paedophora H. L. CLARK, Mem. Australian Mus., vol. 4, 1909, p. 524 (description and 

 comparisons; description of the pentacrinoid young; discussion; off Manning river, New South 

 Wales, 22 fathoms), pi. 47, figs. 4-10. A. H. CLARK, Mem. Australian Mus., vol. 4, 1911, p. 78 4 

 (in synonymy of Ptilometra mulleri), p. 785 (young of Ptilometra mulleri; description and discus- 

 sion); in Michaelsen and Hartmeyer, Die Fauna Siidwest-Australiens, vol. 3, Lief. 13, Crinoidea, 

 1911, p. 462 (young of Ptilometra mulleri; discussion, and comparison with similar young of 

 P. macronema [ = A. wilsoni] here described); Crinoids of the Indian Ocean, 1912, p. 189 (in 

 synonymy of Ptilometra mulleri). -H. L. CLARK, Biol. Results Fishing Exper. F.I.S. Endeavour, 

 1909-14, vol. 4, pt. 1, 1916, p. 24 (possibly the same as Antedon wilsoni; perfectly sure it is not a 

 Ptilometra and has no near relationship with that genus). GISLEN, Zool. Bidrag Uppsala, vol. 9, 

 1924, p. 281, footnote 1. 



Antedon wilsoni (part) A. H. CLARK, Mem. Australian Mus., vol. 4, 1911, p. 715 (young of Ptilometra 

 macronema or of P. mulleri [ = auslralis]), p. 718 (records). 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). 



Ptilometra mulleri (part) A. H. CLARK, Mem. Australian Mus., vol. 4, 1911, p. 783 (Himerometra 

 paedophora the young of this species), p. 786 (description and discussion). 



Ptilometra mulleri (part) A. H. CLARK in Michaelsen and Hartmeyer, Die Fauna Stidwest-Australiens, 

 vol. 3, Lief. 13, Crinoidea, 1911, p. 462 (Himerometra paedophora the young of this species); 

 Crinoids of the Indian Ocean, 1912, p. 189 (Himerometra paedophora in synonymy) ; U.S. Nat. 

 Mus. Bull. 82, vol. 1, pt. 1, 1915, figs. 90, 91, p. 149. MORTENSEN, Studies in the development 

 of crinoids, 1920, p. 4 (young carried on the cirri [error for pinnules]). 



Himerometra poedophora MOHTENSEN, Studies in the development of crinoids, 1920, p. 60, footnote 39 

 (possible care of brood). 



Aporomelra paedophora 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 only a single record from New 

 South Wales). 



Diagnostic features. Most of the cirrus segments are about as long as broad. 

 The arms are about 20 mm. long, and the cirri are VTI-IX, 25-35 (usually 28-30). 



Description. The centrodorsal is thick-discoidal, with the cirrus sockets in a 

 single marginal row. 



The cirri are VII-IX, 25-30. The first two segments are about twice as broad as 

 long, the third is somewhat longer, and the fourth and following are about as long as 

 broad. The segments in the outer half of the cirri have the proximal edge of the dorsal 

 half cut away and are somewhat compressed dorsauy, being almost carinate on some 

 of the cirri. The penultimate segment bears a prominent opposing spine which is 

 terminally situated and reaches in height about half the width of the segment bearing 

 it. The cirri are comparatively thick at the base and taper gradually until about the 

 fourth segment after which they remain of the same width. 



The ends of the basal rays are visible as slight tubercles in the angles of the calyx. 



