THE RECENT CRINOIDS OF AUSTRALIA — CLARK. 789 



Clark first showed me his pcedophora, namely, that pcedophora 

 is nothing but the young of Ptilornetra mulleri, the sacculi, the 

 broad I Br series and first two brachials, the syzygies, and the 

 ambulacral plating of the larger specimens preventing its refer- 

 ence to any species outside of that genus. 



Genus S T 1 R E M E T R A, ^. Z^. Clark. 



Stiremetra, 1909, A. H. Clark, Proc. Biol. Soc. Washington, vol. 

 22, p. 15 (Antedon acutiradia, P. H. Carpenter, 1888). 



Differential Characters. — In Stiremetra as in Ptilornetra the 

 pinnules are prismatic and stout, with the ambulacral grooves 

 bordered by side and covering plates ; these are much better 

 developed than in Ptilornetra, however, and Pj, instead of being 

 smaller and shorter than Pg as in Ptilornetra, is much enlarged 

 and much longer than the following pinnules. The centrodorsal 

 is hemispherical or bluntly conical, with the cirius sockets 

 arranged in ten columns of usually two sockets each. The lower 

 part of the animal is compressed, so that the elements of the I Br 

 series and the lower brachials are sharply flattened against each 

 other laterally. There are only ten arms. 



Range. — Kermadec Islands and Port Jackson to Fiji and the 

 Philippines ; mostly in deep water, but one species is littoral. 



STIREMETRA ARACHNOIDES {A. H. Clark). 



Stenometra arachnoide$, 1909, A. H. Clark, Proc. U.S. Nat. Mus., 

 vol. 36, p. 402 (off Tawi Tawi, Philippines, 12 fms.; Port 

 Denison). 



A specimen of this species was found in the jar containing the 

 type specimen of Amphimetra discoidea. The U.S. National 

 Museum received these Crinoids many years ago in exchange 

 from the Australian Museum. They were collected at Port 

 Denison, Queensland. 



This specimen and the type, which was obtained by the 

 "Albatross" in the Philippine Islands, are tlie only examples of 

 this interesting form so far known. 



Suborder MACROPHREATA, A. H. Clark. 



Family ANTEDUNID^, Norman 



Subfamily ANTEDONIN^, A. H. Clark. 



Genus C O M P S M E T R A, J. //. Clark. 



Compsometra, 1908, A. H. Clark, Proc. Biol. Soc. Washington, 

 vol. 21, ]). 131 (Antedon loveni. Bell, 1882, =Aniedon 

 pumila, Bell, 1884). 



