764 " THETIS " SCIENTIFIC RESULTS, 



Differential Characters^. — The long cirri, which are very stout 

 at the base but gradually taper to a point, distinguish this species 

 at once from all other Comatulids. It has usually about thirty 

 arms in the vicinity of 125-150 mm. in length ; the cirri are 

 about 45 mm. long. 



Australian Recoo'd. — The Copenhagen Museum possesses a fine 

 specimen of this species which was collected at Sydney, New 

 South Wales, many years ago. Professor Lutken labelled it 

 Anledon australis, but he never described it ; Dr. Carpenter 

 examined it during his visit to Copenhagen, and mentioned some 

 of its characters in discussing the type specimen of G. acuticirra. 

 More recently I have examined it and published a detailed 

 description and figure. 



Mange. — Oraspedometra acuticirra ranges from the Mergui 

 Archipelago and the Andaman Islands to Hongkong, and south- 

 ward to Sydney, New South Wales. 



Genus A M P H I M E T R A, A. JI. Clark. 



Amphimetra, 1909, A. H. Clark, Proc. Biol. Soc, Washington, 

 vol. 22, p. 6 (CoMATULA [Alecto] milberti, J. Miiller, 1846). 



Differential Characters. — The species of Amphimetra are re- 

 markable for the excessive shortness of the outer brachials. The 

 elements of the division series and the proximal brachials are 

 more or less swollen. In the ten-armed species the lower pinnules 

 are all subequal, but in the mnltibrachiate forms they are, some 

 of them (though never the first), enlarged, with more or less 

 delicate tips, and often bear in the distal part of each segment 

 strong lateral processes, resembling those characteristic of Oligo- 

 metra serripinna. 



Range. — Amphimetra is found from south-eastern Africa to 

 Australia, the Philippine Islands, and southern Japan ; the ten 

 armed species are found from Queensland to Singapore and the 

 Philippine Islands. 



AMPHIMETRA VARIIPINNA {P. H. C). 



Antedon variipinna, 1882, P. H. Carpenter, Journ. Linn. Soc. 

 (Zool.), vol. 16, p. 506 (Canton, China).— 1888, "Chal- 

 lenger" Reports, ZooL, vol. 26, p. 256 (Prince of Wales 

 Channel, 8 /ms).— 1894, Bell, Proc. Zool. Soc, 1894, p. 394 

 {JV. W. Australia, 9-38 fms). 



Antedon crenulata, 1882, P. H. Carpenter, Journ. Linn. Soc, 

 (Zool.), vol. 16, p. 507 (Borneo). ^ . , 



