CILIATE FIBRILLAR SYSTEMS 243 



each of which turns sharply and continues to the endoplasm, parallel to 

 the main axis of the oral pit. 



Method 



Fixatives: Schaudinn's, Zenker's. 



Stains: Heidenhain's iron-haematoxylin, Delafield's (for fibrils), Klein's 

 (1926) (for ciliospores), Lund's wet silver method (for adults). 



Lechriopyla mastax (Lynch, 1930) . — The cilia of Lechriopyla mastax 

 can be divided into three areas : ( 1 ) the cilia of the general surface of 

 the body, (2) the cilia of the peristome, and (3) a transverse band 

 of cilia known as the supraoral band. The basal granules of all these 

 cilia are connected by delicate longitudinal fibrils without transverse con- 

 nectives. Below the ciliary lines of the peristome and vestibule are verti- 

 cal pellicular lamellae, which are fused to the furcula described below. 



A crescent-shaped neuromotorium lies beneath the pellicle at the 

 left end of the peristome. Its ends are continued as long fibers, the 

 anterior and posterior adoral fibers, which form a complete (or nearly 

 complete) ring about the peristome. From the ring arise the ciliary lines 

 which extend over the surface of the body, or pass into the peristome 

 and the pharyngeal involution. A variable number of fibrils arising from 

 the outer border of the motorimn extend through the cytoplasm for vary- 

 ing distances, to fuse with the pellicle just beneath a ciliary line. They 

 may branch or anastomose, and they become more delicate distally. 



The jurcula, shaped much like a heavy tuning fork, partly surrounds 

 the vestibule. The ends fuse with the walls of the pharynx, and delicate 

 fibrils from the pharyngeal wall extend to the jurcula. This organelle 

 may be an additional element of the neuromotor system. 



A long pellicular fiber extends from the left end of the internal open- 

 ing of the cytopharynx to the middle of the posterior end of the organism 

 and occasionally curves along the right side for varying distances. This 

 fibril is not included in the author's description of the neuromotor sys- 

 tem. 



Methods 



Fixatives: Bouin's, Schaudinn's, Da Fano's cobalt nitrate-formalin. 

 Stains: Iron alum haematoxylin, carmines, cochineals, Yabroff's silver- 

 nitrate method (no success), Klein's silver method. 

 Sections prepared in a variety of ways. 



