BIOLOGICAL BULLETIN, VOL. XXIII. 



PLATE III. 



100 

 9 

 96 

 9t 

 92 

 90 

 89 

 96 

 84 

 82. 



fo 



78 

 76 



7"* 

 72 

 70 

 66 

 66 

 fr4 

 61 

 foo 

 58 

 5fc 

 5^- 

 52 

 So 



to 



f 6 

 <-. 



-f J. 



4-O 



32. 

 30 

 28 



1C 



i-t 

 2.2. 

 ZO 

 18 

 16 

 I* 

 IZ 

 IO 



S 



I*- 15 I b 



10 



g , , 



i 3 



FLORENCE A WATTERS. 



