MONOGRAPH OF J-KPANESE OPHIUROIDEA. 81 



Fi-om the 20**^- to the 21"'- . . 5 mm.-12 mm .9 mm.-4 mm 



I I 



From the 2V' to the 22"^" 11 mm.-5 mm. . . 4 mm.- 9 mm. 



1 I 



From the 22"'^- to the 23'^'^ . . 4 mm.-lO mm 9 mm.-4 mm. 



I I 



From the 23''''- to tlie 24*''- 8 mm.-4 mm. . .4 mm.- 9 mm. 



I I 



Fi-om the 24"'- to the 25^'' . . 4 mm.-lO mm 9 mm.-4 mm. 



I I 



From the 25'''- to the 26'" . . 11 mm.^ mm. . . 3 mm.- 6 mm. 



I I 



From the 26* to the 27'" . . 4 mm.-li mm 7 mm.-3 mm, 



I ! 



From the 27'*'- to the 28'" 9 mm. -3 mm. 3 mm.- 6 mm. 



I I 



From the 28'"- to the 29'" . . 5 mm.- 9 mm 4 mm.-3 mm. 



' I 



From the 29'"- to the 30'"- 7 mm. -4 mm. . . 2 mm.- 4 mm. 



I I 



From the 30'"- to the 31«' . . 3 mm.- 8 mm 3 mm.-2 mm. 



I I 



From the 31^'- to the 32°*^ 6 mm. -4 mm. . . 2 mm.- 3 mm. 



From the 32"'*- to the 33'^'' (or | | 



to the end) 3 mm.- 6 mm 2 mm.-l mm. 



I 

 From the 33'"'^- tu tlie 34'"- 6 mm.-4 mm. 



I 

 From the 34'" to the 35'" . . 4 mm.- 5 mm. 



1 

 From the 35'" to the 36'"- 3 mm.-2 mm. 



1 

 From the 36'"- to the 37'"- . . 2 mm.- 3 mm. 



I 

 From the 37'"' to the end 2 mm.-l mm. 



Total length of the arm 421 mm 324 mm. 



Width of the ventral sm:^ace of the arm within the disk 17 mm. 



Width of the shaft between the 1^ and 2^'^- bifm:cations 10 mmi 



Width of the main (adradial) shaft between the 2"*^ and 3'^'' bifur- 

 cations 7 mm. 



Disk decagonal, with concave interbrachial and brachial borders, 

 the former being longer and more concave than the latter ; very- 

 convex, but with more or less depressed central region, covered by 

 a thick skin, which is chagreened by the presence of very fine, 

 close-set granules. The granules are smooth, not acute, irregular 

 in size when viewed under the microscope, the coarser ones being 

 more numerous on the radial ribs than in the intercostal spaces. 



