250 



The Unity of the Organifim 



Figure 6 shows numerous details of the system of external 

 organs of Stylonijchia histrio. The figure was made from a 

 section of the peristomal field. Special attention is called to 

 the finely striated appearance of the membranellaCj m I, and the 



M±>p, 









Eri 



^j 



FIGURE 6. STYLONYCHIA HISTRIO ( AFTER 3IAIER). 



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

 Bs-S basal strand of membranellae. J., endoplasmic inclusions. Bf., 

 l)asal fibers, p., pellicula. En., endoplasm. 



pre-oral membrane, m 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 



