NO. 1.543. TWO NEW CRINOIDS FROM NORTH PACIFIC— CLARK. 509 



in five narrow line.s over the snrface of the cal3"x, widely separated from 

 each other b}" the interradial integ-ument, which forms two-thirds of 

 the superficial area of the calyx, the radials themselves collectively 

 occupyino- onl}" about one-third. (See fig-. 1.) 



The five basals are triangular in shape, 4 mm. long b}^ 2 mm. high, 

 and are in apposition all around (the lateral angles being slightly 

 blunted at the point of contact) except in one place, where 2 adja- 

 cent basals do not quite meet, leaving a gap of about ^ mm. They 

 thus form a ring, interrupted in one place, about the lower part of 

 the calyx. The lower (dorsal) edges of the basals are somewhat convex, 

 giving the upper edge of the top stem joint a scalloped appearance. 



The five first radials are practically equal in size, 5 mm. wide by 2.5 

 mm. high, and are produced dorsall}^ into a shallow V where they 

 enter the interbasal spaces. Each first radial is in close apposition to 

 .those on each side of it along its entire lateral edge, the five therefore 

 forming a continuous ring about the base of the calyx. The outer 

 surface of these, as of all the radials, is strongly convex, a cross sec- 

 tion being practically a semicircle. The succeeding radials all have 

 practically parallel sides, and are (the radials of the separate rays) 

 separated from each other by a broad expanse of tough, leathery integ- 

 ument, equal in width in each interradial area to about twice the width 

 of the radials as far down as the fifth or fourth radial, then rapidly 

 converging, forming a V, the apex of which rests on an interradial 

 suture of the first row of radials. The first and second radials are 

 5 mm. in width; distally the width increases slightly, reaching a max- 

 inuun of 6 mm. on the fourth or fifth, then gradually decreasing again 

 to 4 mm. on the sixteenth. The radials number from 12 to 18 (including 

 the first axillaries), syzygies being distributed as follows: on one arm 

 the second, fourth, sixth, tenth, twelfth, fifteenth, and nineteenth 

 (axillary); on another the second, fourth, and twelfth; on another the 

 second (a doul)le syzygy of 8 components), fourth, sixth, ninth, 

 eleventh, and fourteenth (axillary); on another the second, fourth, 

 sixth, eighth, and eleventh, and on the last (arm broken ofi' before the 

 first axillary) the second, fourth, and eighth. 



The proximal pinnules are 33 mm. in length, or about equal to the 

 distance from the basals to the first axillary, in the arm having the 

 maxinuun iuunl)er of radials. They are at the l)ase nearly the diameter 

 of the first brachials (3 nmi.), tapering graduall}' to a point, the num- 

 ber of joints being about 2(>. The first pinnule is given off as follows: 

 on the right side of the sixth radial (the epizygal of a syzygy), on the 

 right of the sixth radial (not a syzygy), on the left of the fifth radial 

 (not a syzygy), on the left of the epizygal of the sixth radial, and on 

 the left of the sixth radial (not a syzygy). The palmar pinnules are 

 about nun. in length, 1 nun. thick at the base, tapering gradually to 

 a point, and are composed of al)out 20 joints. 



