No. 437.] COMPOUND EYES OF MA CHI LIS. 



327 



The retinitis. — In specimens which have not been depig- 

 mented the rhabdoms are surrounded throughout their entire 

 length, by a thin sheath of reddish brown pigment. (Fig. 9.) 

 In cross sections, this pigment is seen to extend up close to each 

 rhabdom, filling the spaces between its seven points (Fig. 8.) 

 In longitudinal sections this narrow area of reddish brown pig- 



