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



319 



have twenty-one arms. Of tlie seventeen armed specimens one lias the arms 75 mm. 

 long; all seven of the IIBr series are 4(3 + 4); the cirri are 18 mm. long and 

 have 26-28 segments; the colour is white; the other has the arms 85 mm. long; 

 the calyx and arm bases are white, the arms being light yellow brown. Of 

 the eighteen armed specimens one has the arras about 75 mm. long ; all the 

 IIBr series are 4(3+4); one TIlBr 2 series is developed internally on one of 

 the rays; the cirri have 32-36 segments and are 23 mm. long ; the colour is 

 light yellow brown ; another has the arms 90 mm. long ; the cirri are 23 mm. 

 long and are composed of 30 segments; the colour is white; the third has 

 the arms 110 mm. long: one of the IIBr series is 2, the remaining seven being 

 4 (3+4) ; both of the missing IIBr series are absent from the same ray; the 

 cirri have 30-33 segments and are 23 ram. long. One of the twenty armed 

 specimens has the arms 70 mm. long; in colour it is white, becoming yellow 

 brown on the arms; the pinnules are purple; another has the arms 85 ram. 

 long; all of the IIBr series are present, and all are 4 (3+4); the cirri are 

 20 mm. long, and are composed of 25-27 segments ; the colour is white, the 

 proximal part of tlie arms laterally spotted and the remainder of the arms 

 narrowly banded with purple ; the cirri are brown ; the third has the arras 115 mm. 

 long; all ten of the IIBr series are present, and all are 4(3+4); the cirri 

 are XIV, 33-34, 25 mm. long; the colour is white, with faint purplish blotches 

 on the arms ; the cirri are purple. One of the twenty-one armed specimens has 

 the arms 75 mm. long; all of the IIBr series are present, all 4 (3+4) ; the single 

 IIIBr series is 2, developed internally ; the colour is white, the cirri deep purple ; 

 the other twenty-one-armed specimen has the arms 80 mm. long; all of the IIBr 

 series are present, and all are 4 (3 + 4) ; the single IIIBr series, which is developed 

 internally, is 2; in colour the calyx and arm bases are white, the arms yellow 

 brown, and cirri purple. 



Both the specimens from •'(?) India" are small, the larger having twelve 

 arms 25 mm. long. 



DICHROMETRA CILIATA, sp. nov. 



Description.— Centrodorsal moderate, the dorsal pole concave, 2 mm. 

 in diameter. 



Cirri XXVII, 29—35 (usually about 33), 30 mm. long; small but prorainent 

 dorsal spines are developed from tiic tenth to thirteenth segments onward. 



Thirty-four to forty-two arms 110 mm. to 120 mm. long; the division series 

 and arms' resemble those of D. flagdlatu, but arc more smooth, and have no 

 trace of .synarthrial tubercles. 



P is 11 -5 mm. long, very slender, with twenty-nine segments, of which 

 the second and third are about as long as broad, the fourth tapers somewhat 

 distally, and the fifth and following are half again as long as broad, soon be- 

 coming twice as long as broad and three times as long as broad distally. P^ is 



