46 ECHINODERMA OF THE INDIAN MuSBUM, PART VII. 



e^ at least the distal pinnules exceedinirly slender, cylindrical, composed 

 of much elongated segments, the articulations somewhat swollen ; side 

 and covering plates entirely absent, or feebly developed and not visible 

 in ordinary examination, 

 fi genital pinnules triangular in cross section, and longer than the 



distal ; cirri short, stout, with subequal segments which do not bear 



dorsal spines distally. 



{()) TR(JPIOMETRID.9!;, p. 176. 



{Cf. keys 4, 15.) 



f'^ genital ])innules slender and cylindrical like the distal, but shorter, 

 g' cirrus segments subequal, almost never longer than broad, 

 bearing a serrate transverse ridge (rarely two) or paired or tri- 

 cuspid spines dorsally ; enlarged lower pinnules with spinous 

 processes on the distal ends of the segments. 



(O) COLOBOMETRID.E, p. 1.515. 



(('/. keys 4, 5, 14.) 



g* some at least of the cirrus segments longer than broad ; cirri 

 smooth, carinate dorsally, or bearing single median dorsal spines, 

 h' P, slender and delicate, usually flagellate, with much elongated 

 segments; cirri dehcate, deciduous, with much expanded ar- 

 ticulations, at least in the proximal half ; very rarely more than 

 ten arms; brachials triangular, as long as, or longer than, 

 broad; syzygies regularly distributed.' 



(M) ANTEDONID^, p. 227. 



{Cf. keys 4, 5, 19, 20.) 



\\- cirri robust, tenacious, the articulations not expanded, or only 

 very slightly so ; brachials wedge-shaped or discoidal, broader 

 than long; syzygies irregularly spaced, occurring only at long 

 intervals ; almost always more than ten arms ; if only ten arms 

 the brachials are very short and discoidal. 

 i' IIBr 4 (3-|-4) , or with ten arms. 



(()) llIIMKROMETRID.li;, p. 107. 



{Cf. keys 4, 5, 10.) 

 i* IIBr 2. 



j' P| greatly elongated, much longer than the very short 

 succeeding pinnules. 



(O) PONTIOMETRIDJi, p. 138. 



{Cf. keys 5, 12.) 



' The Ea-st Indian species are all of small size; llie Inrgost as well as the smallest of the coiiia- 

 tiilids belong to this family. 



