310 Austin Hobart Clark, 



Farn. Zygometridae A. H. Clark. 



Zygometra microdismis (Bell). 



1911. Zygometra microdiscus, A. H. Clark, Die Fauna Südwest-Australiens, III, p. 458. 

 — 1912. A. H. Clark, in: Smithson. Collect., LX, No. 10, p. 11. 



Locality: Sharks Bay, South Passage, 9 m; 16. VI. 05. 



One specimen with fifty arms 140 mm long, and cirri about XXXV, 

 30—31, stout, 25 mm long; one IIBr, of a IIBr 4(3 + 4) series bears in- 

 stead of a pinnule a slightly undersized arm tlie first division series of 

 which consists of five ossicles all apparently united by synarthry and none 

 bearing pinnules; this carries two IVBr series, both 4(3 + 4): the arms 

 have a knotty and irregulär appearance, which is probably due to para- 

 sitization; Pi is from 23 mm to 25 mm long, very stout, tapering gra- 

 dually to a delicate tip, and composed of from twenty-five to twenty-seven 

 Segments. 



Zygometra ptuictata A. H. Clark. 



1911. Heterometra bengalends, A. H. Clark, in: Memoirs of the Australian Museum, IV, 

 Part 15, p. 768 (Port Curtis, Queensland ; Holothuria Bank, northwestern Australia, 

 15 fathoms). — 1911. A. H. Clark, in: Die Fauna Südwest-Australiens, III, p. 440, 

 443, 444 (Port Curtis; Holothuria Bank). 



1912. Zygometra punctata, A. H. Clark, in: Proc. Biol. Soc. Washington, XXV, p. 24 

 (Aru Islands, 13 m). 



Distribution : A r u I s 1 a n d s , P o r t C u r t i s , Queensland, and 

 Holothuria Bank, northwestern Australia. 



Deptli: Littoral, descending to 15 fathoms. 



Notes : At the time when I was studying the collections belonging to 

 the Australian Museum I found among them three small specimens which 

 agreed with Hartlaub's description and figures of Heterometra hengalensis, 

 and also, except in size, with the numerous examples of that form included 

 in the "Investigator" collection, receutly come to hand. When in London 

 I found a similar specimen in the British Museum which had been dredged 

 on Holothuria Bank. 



Among the Comatulids collected by the "Siboga" at the Aru Islands 

 I found some additional specimens which I at once recognized as repre- 

 senting the same form as those from Port Curtis and Holothuria Bank; 

 but they were better developed, and obviously represented a species of 

 Zygometra instead of a species of Heterometra. I accordingly described 

 them as new under the name of Zygometra punctata. 



The records of Heterometra hengalensis in Australia all refer to Zygo- 

 metra punctata. 



