23Q BULLETIN 82, UNITED STATES NATIONAL MUSEUM VOLUME 1 



Table 6.— Proportions of the cirrus segments in some specimens of Antedon bifida bifida— Continued 



in 15 specimens of moroccana, 1.33 — 1.80:1, average 1.57:1 

 in 40 specimens of bifida 1.09 — 1.67:1, average 1.43:1 



Range of A :B 



' s.u. for the finer measurements signifies the scale units of my microscope eyepiece, of which 22 equal one millimeter. For the 

 purposes of the ratios It did not seem worthwhile to convert them. 



