PART 5 A MONOGRAPH OF THE EXISTING CRINOIDS 95 



The disk is from 8 to 9 mm. in diameter; the dorsal interradial perisome is more 

 or less abundantly plated. 



The ends of the basal rays are prominent as large rounded triangles in the angles 

 of the calyx. 



The distal edges of the radials are just visible beyond the border of the centro- 

 dorsal, and just meet in the angles of the calyx over the ends of the basal rays. The 

 IBr, are oblong, about four times as broad as long, with straight lateral borders, those 

 of t\vo adjacent ossicles making with each other a wide angle of about 80. The IBr 2 

 (axillaries) are triangular, half again as long as broad with all the sides practically 

 straight and the anterior angle slightly and narrowly produced; they are widely 

 separated from each other laterally. 



The 10 arms are about 50 mm. long in the adult. The brachlals have slightly 

 projecting and very finely spinous distal edges. Syzygies occur with an interval of 

 usually 4 (-6) muscular articulations. The brachials proximally are short, with the 

 length about half the breadth. There are about 24 articulations per centimeter 

 (including the syzygies). 



P! is up to 8.5 mm. long, with 30 to 35 segments all of which are relatively short 

 but the fifth to the twelfth are as long as broad. On about the third to the eighth 

 segments there is a knob on the dorsal side distally, which produces a saw-like profile to 

 the pinnule. This feature continues out to the pinnules on the middle part of the arm. 

 The middle part of PI is fairly smooth but toward the tip of the pinnule a slight swelling 

 on the middle of each segment may become more marked so as to produce the effect 

 of a rudimentary comb. The development of this feature is apparently variable since 

 Dr. H. L. Clark could distinguish no trace of any kind of comb in the specimens that 

 he studied. 



P 2 has 32 to 35 segments and measures up to 9 mm. in length. 



P 3 has 25 to 33 segments and is 8 to 11 mm. long, it bears the first gonad on the 

 third to tenth segments and is stouter than the first two pinnules. 



The following pinnules are similar; the gonads extend as far as the eleventh or 

 twelfth, but rapidly decrease hi size after the eighth or ninth. The distal pinnules are 

 very slender, 5.5 mm. in length and composed of 14 or 15 segments. 



The color in life is brownish yellow and there may be olive green spots. 



a 



FIGURE 6. Annametra occidental^! 

 (.\. II. Clark), B.M., 1949.9.27. 

 48, Table Bay: a. Pen. 

 cirrus;*, P,; f, P 2 . 



