250 



The Vniiy of the Organism 



Figure 6 shows numerous details of the system of external 

 organs of Stt/loni/chia histrio. Tlie figure was made from a 

 section of the peristomal field. Special attention is called to 

 the finely striated ap2:)earance of the mcmbranellae, m I, and the 



Ml- 

 Bs--- 



Sc,---S^ 



■ O'isi ■:. ' <■ 





0: 



■■<l>'^' 





E« 



FIOURE 6. STYLONYCHIA HISTRIO (aFTER MAIER). 



Mbp,, preoral membrane. Sc, frontal cirrhi. Bs., basal strand. 

 Bs.\ basal strand of menibranellae. J., endoplasmic inclusions. Bf., 

 I)rfsal fibers, p., pellicula. P2n., endoplasm. 



pre-oral membrane, in hp, these striae being evidence that the 

 organs are produced by a fusion of cilia. The distinction be- 

 tween the basal lamella, hi, and the basal granules should also 

 be noticed. The investigation from which this figure is taken 

 is particularly instructive because it is based on a large num- 

 ber of representative genera and because the discussion brings 



