﻿ASTROPIIYTON COSTOSUiU 



First lork to .suooiid, S"" 



Sl'comiI •• •■ tliinl 11 



Thinl '• " fourth, 14 



Foui-tli " '• fii'lli, 14 



Fifth •' •• sixtli, 14 



Sixth " '• seveiitii, IG 



Seventh ■' " eighth, IG 



Eighth " " niutii, IG 



Ninth " " tenth, 16 



Tenth " " eleventh, 19 



Eleventh " " twelfth 18 



Twelfth " '• thirteenth 19 



Thirteenth " " fourteenth, .... 20 



Fourteenth " " fifteenth, 17 



Fifteenth ■' " sixteenth 17 



Sixteenth " " seventeenth, .... 18 



Seventeeutli " '• eighteenth, . . . . 21 



Eighteenth ' " nineteenth, .... 18 



Nineteentii " " twentieth 18 



Twentieth '• " twenty -first, .... 18 



Twenty-first " •' twenty-second, ... 17 



Twenty-seL'ond " '• twenty-third, ... 15 



Twenty-tliird " '• twenty-fourtli, ... 16 



Twenty-fourth " '• twenty-fifth, . . IG 



Twenty-fifth " '• twenty-sixth, ... 20 



Twenty-sixth " " twenty-sevent'i. . . 13 



Twenty-seventh •' " tweiity-eightli, ... 12 



Twenty-eighth " '■ twenty-ninth, ... 12 



Twenty-ninth " ■' thirtieth, .... 11 



Thirt'eth " " thirty-first 10 



Tliirty-first " " thirty-second, ... 8 



Thirty-second, •' " end, 11 



TotalleiiKth, 489'" 



193 



Distance from outer side of madreporic shield to inner points of teeth, 

 to that between outer corners of mouth-slits, 19 : 9. Teeth, tooth- 

 papillfe, and mouth-papillae sharp, conical, of different sizes ; about 

 eight, which occupy the place of teeth, are the largest, and attain the 

 length of 2.8'°"'- ; those which represent the inner mouth-papillas are 

 smallest ; the outer mouth-papillce extend quite to the outer corner of 

 the mouth-slit. Madreporic shield irregular oval, broader than long, 

 rather indistinct ; placed at the inner angle of the interbrachial space. 

 Arms covered above, below, and on the sides by a close, fine, smooth 

 coat of microscopic grains. Below and on the sides the joints are 

 plainly indicated by cross lines. On the upper side runs a distinct, 

 longitudinal, sunken line ; here also are scattered round spots, which, 

 under the microscope, appear a little raised, and are made up of con- 

 centric rings of oblong grains. On the tip branches most of the grains 

 are brous-ht together to form a douljle vertical row of grains, which 



