A. H. CLARK : THE CRINOIDS OF THE INDIAN OCEAN. 55 



c' cirri slender and numerous ; all the segments elongated and without dor- 

 sal spines or projections. 



COMINIA, p. 83. 



c* cirri stout, comparatively few in number, the distal segments short and 

 bearing dorsal processes, 

 d' ten arms; synarthrial tubercles usually prominent. 



COMISSIA, p. 77. 



d** more than ten arms ; synarthrial tubercles not developed. 



e' a pinnule on the first brachial of arms arising from a IIBr or subse- 

 quent axillary ; a syzygy between the second and third brachials of 

 the free undivided arm. 



CAPILLASTER, p. 73. 



e'^ no pinnule on the first brachial of any arm. 



f division series all 2; a syzygy between the first two brachials, at 

 least on the inner arms. 



COMATELLA, p. 68. 



f* at least half of the IIBr or further division series 4 (3-|-4). 



g' IIBr series 4 (3-|-4), further division series 2 (l-|-2), or 2; 

 proximal pinnules more slender than the succeeding ; terminal 

 combs occur at intervals on the distal pinnules. 



COMASTEE, p. 83. 



g^ some or all of the outer division series 4 (3-J-4) ; proximal pinnules 

 stouter than the succeeding ; no combs on the distal pinnules, 

 h' IIIB series all 2. 



COMANTHERIA, p. 89. 



h^ IIIBr series 2 externally. 4 (3-|-4) internally. 



COMANTHINA, p. 91. 



h» IIIBr series 4 (3-|-4). 



COMANTHUS, p. 89. 



b* cirri absent ; centrodorsal reduced to a small thin pentagonal or stellate 

 plate, 

 c' a pinnule on the first brachial of arms springing from a IIBr or subsequent 

 axillary. 



CAPILLASTER, p. 73. 



c* the first brachial never bears a pinnule. 



d' IIBr series 4 (3-1-4); subsequent series 2 (1-^2) or 2; proximal pinnules 



more slender than the succeeding; terminal combs occur at intervals 



along the distal pinnules. 



COMASTER, p. 83. 



