733 



THE RKCF.NT CHINOIDS OK AUSTRALIA — CLARK. 681^ 



h'^. The outer arms on each ladius averaging only half as long as 



the inner arms (iV. M'. Anx/ralia) C. etheridgei, sp. nov^ 



«■■'. Ten arms ; cirri present. 



b^. Thirty or more very short cirrus segments {Souther7i Aus- 

 tralia) C. brachiolata. 



b-. Less than twenty-five cirrus segments, which are of moderate 

 length. 



c^. Eighteen or more cirrus segments (Queensland and N.W. 



Australia) C. Solaris^ 



("2. Fifteen or less cirrus segments. 



(i'-. Cirri occurring all round the periphery of the centro- 



dorsal (Queensland and A^. IV. Australia) G. pectinata. 



d'^. One or two cirri in each interradial angle (Queensland 



and N.W. Aiistralia) 0. purpurea^ 



Key to the Australian Species of the Genus Comaster. 



a^. Less than fifty arms (Queensland and N. W. Australia) G. mtdtijida.. 



a-*. Usually eighty or more arms (Queensland and N. W. Australia) 



G. typica. 



Key to the Subgenera of the Genus Comanthus. 



a^. Ill Br 2, rarely 4 (3 + 4) Gomantheria. 



a^. Ill Br 2 externally, 4(3 + 4) internally Comanthina. 



a^. Ill Br 4 (3 + 4), rarely 2 Gomanthus.. 



Key to the Australian Species of the Subgenus Gomantheria. 

 a-. IV Br and foil owing series 4 (3 + 4) (Queensland; N. W. Australia) 



C. briareus,. 



ft2. IV Br series 4(3 + 4), V Br series 2, VI Br series 4(3 + 4) ((3?tee?i.9- 



land) G. alternans^ 



Key to the Au.stralian' Species of the Subgenus Comanthina. 



«■•. IV Br and following series 4 (3 + 4) ; the proximal pinnule seg- 

 ments do not bear dorsal processes (Queensland) G. schlegelii. 



a^. IV Br and following series 2 ; the proximal pinnule segments 

 have strong dorsal processes (Q ueenslaiid a-nd N.W. Australia) 

 G.bellh 



Key to the Australian Species of the Subgenus Comanthus. 

 a^. Cirri long and stout, the segments thirty or more in number, 

 subequal, the distal without dorsal processes ; eighty to one 



hundred and twenty arms (Queensland) G. bennelti. 



a^. Cirri short and slender with less than twenty-five segments, of 

 which the proximal are more or less elongated and the distal 

 short, or absent ; not more than sixty arms. 

 b^. Forty or more arms ; cirri absent (Queensland and N. W. Aus- 

 tralia) C. amndata, 



fc'2. Less than thirty arms ; cirri present. 



c'. Twenty to thirty very slender cirri with nearly twenty 

 segments ; anterior angles of axillaries produced (N.S- 



Wales ».ndi S. AvMralia) G. trichoptera. 



c^. Less than fifteen cirri, which are not especially slender, 

 with less than fourteen segments ; anterior angles of 

 axillaries not especially produced (Queensland and N. W. 

 Australia) C. parvicirra. 



