59 



Stat. 294: Three small specimens, one with 12, two with 11 arms. 



Stat. 310: Small, with 13 arms, undergoing adolescent autotomy; there is a single IIBr 

 2 series hearing two IIIBr 4 (3 + 4) series. 



Stat. 315: 15 arms 30 mm. long; three of the IIBr series are 2 and two are 4(3 + 4). 



Banda, reef: small, with 1 1 arms. 



Banda, 9 — 36 Metres: (1) 14 arms about 40 mm. long; (2) 12 arms about 40 mm. 

 long\ under£oing adolescent autotomy. 



Maumeri: (1) 21 arms 80 mm. long; three of the IIBr series are 2, all the other division 

 series being 4 (3 + 4); the single IIIBr series is externally developed; the cirri are XIV, slightly 

 lafger than usual; (2) smaller, with 20 arms; there are nine IIBr series of which four are 2 

 and five are 4 (34-4); the single IIIBr series, of 2, is internally developed on a ray with two 

 IIBr 2 series. 



Haingsisi: 17 arms 95 mm. long; two of the IIBr series are 2 and five are 4 (3 + 4!: 

 there are four broken cirri. 



II. Family Zygometridae A. H. Clark. 



Zygometra A. H. Clark. 



Key to the Species of the Genus Zygometra. 



a 1 More than 40 cirrus segments; more than 35 (usually 40 or more) arms 

 (northern Australia and the Aru Islands) 



b 1 more than 40 arms; most of the IIIBr and following division series 

 4 (3 + 4); proximal pinnules very stout and very long, tapering to a 

 flagellate tip as in Himerometra magnipinna; cirri very long and stout 



(northern Australia and the Aru Islands) microdiscus*) 



b 2 about 40 arms; most of the IIIBr and following division series 2; 

 proximal pinnules of moderate length, and not especially stout; cirri not 



especially long nor stout (northern Australia) elegans-) 



a 2 Less than 36 (usually 30 or less) cirrus segments; less than 40 (usually 

 20 — 30) arms 



b 1 more than 25 (usually about 30) cirrus segments 



c 1 border of the ossicles of the division series and of the first two 

 brachials smooth and not produced (Merg ui Archipelago to 

 Singapore and the Malay Archipelago, northward to 



the Philippines and Hong Kong) comata 



c 2 borders of the ossicles of the division series and of the first two 

 brachials thickened and everted, finely scalloped or tuberculated 

 (India) andromeda 



1) Synonyms (?) Hvponome sarsii Loven; Antedon multiradiata P. II. Carpenter; Zygometra mertoni Keichensperger. 



2) Synonym Antedon fliicluaiii P. H. Carpenter. 



