KO. 1820 RECENT CRINOIDS FROM PHILIPPINES — CLARK 209 



Cirri marginal, arranged in two closely crowded, irregular, but 

 more or less alternating rows xxx-xl, 18-25^ (usually 20-24), 

 30 mm. to 35 mm. long; first joint about twice as broad as long, 

 second not quite so long as broad, third squarish or very slightly 

 longer than broad, fourth slightly longer, fifth slightly longer still, 

 about half as long again as its median diameter; next three joints 

 similar, the following then gradually decreasing in length, the ter- 

 minal six or seven being squarish ; opposing spine, though promi- 

 nent, small, terminally situated, rarely reaching in height more than 

 one-third the diameter of the penultimate joint ; tenninal claw large ; 

 longer than the penultimate joint (usually half as long again, some- 

 times even longer), stout, and moderately curved. 



The cirrus joints are deeply concave dorsally and laterally, though 

 nearl}' straight ventrally; this makes the articulations stand out 

 prominently and gives the cirri a characteristic knobby appearance 

 like those of C. riihroiiava; this character becomes less and less 

 marked as the joints decrease in length distally. 

 Disk more or less plated along the ambulacra. 

 Radials, and usually the first costals also, concealed by the centro- 

 dorsal ; first costals, when visible, very short, united in their anterior 

 half, but widely separated distally; costals united by syzygy; costal 

 axillaries short, triangular, in the smaller specimens about three 

 times as broad as long, in the larger four or five times as broad as 

 long; distichals, palmars, and post-palmars 2; first joints of each 

 division series inwardly united for their proximal half, but their 

 inner edges diverging in their distal half almost in a straight line 

 from the point of union, so that the arms and division series are well 

 separated. Arms 40 to 80 in number; first brachial usually rather 

 large, sometimes nearly as long exteriorly as broad, inwardly united 

 in the proximal half, diverging in almost a straight line in the distal ; 

 there is considerable diversity in the size of the first brachials, some 

 being very short, while most of them are about twice as broad as 

 long exteriorly ; second brachial nearly oblong, about twice as broad 

 as long; third and fourth (syzygial pair) oblong, somewhat less 

 than twice as broad as long; following six or seven brachials oblong, 

 about twice as broad as long, then becoming wedge-shaped, then 

 almost triangular, about twice as broad as long, gradually becoming 

 less and less obliquely wedge-shaped, and very gradually increasing 

 in length, so that the terminal joints are wedge-shaped, about as 

 long as broad, or rather longer, with rather prominent articulations. 



' The number of the cirri are given in Roman numerals, and tlic number of 

 their component joints in Arabic. 



