CILIATES 195 



this is a corona of very regularly placed, slender rods radiating 

 from the central region of the disc out past the ring to the ciliary 

 row overlying the velum. These are dense and homogeneous 

 like the ring; cytochemical techniques reveal that both skeletal 

 elements are made up of scleroproteins. 



Several filamentous tracts assumed to be contractile are inter- 

 woven among the structures described (Fig. 80, PI. XXII). These 

 variously ramify between the kinetosomes of the locomotor cilia 

 and the pellicle of the basal disc, between the latter and the anterior 

 ectoplasm, and between the basal disc pellicle and the ring and 

 radial skeleton. In addition an annular myoneme, of a structure 

 heretofore not encountered, is closely applied against the pellicle 

 of the basal disc just below the velum. It consists of a compact 

 band of smooth parallel laminae, running obliquely within the 

 circular unit, embedded in a matrix of moderate density. The 

 Faure-Fremiet group thus has distinguished two types of 

 myonemes in ciliates : the finely filamentous endoplasmic myoneme 

 and the laminated ectoplasmic myoneme. Both types will be 

 encountered again in the heterotrichs. 



The long tubular infundibulum leading to the mouth of 

 Trichodinopsis is supported by three elastic, protein fibers. Each 

 of these consists of a bundle of regular, parallel fibrils, about 30 m^ 

 in diameter. Some micrographs suggest a close relationship with 

 kinetosomes of the peristomal ciliature, but details are not 

 discernible. 



An infundibular skeleton of very different construction is 

 present in Campanella umbellaria (Rouiller and Faure-Fremiet, 

 1957b). It is a long, coiled fiber with a maximum diameter of 

 about 2 yu,. In thin sections it is seen to be composed of a three- 

 dimensional hexagonal lattice of fine (1-2 m\x) filaments, with 

 small granules at the nodes (Fig. 79, PI. XXI). On the cytoplasmic 

 periphery, the lattice is often flattened into compact parallel rows 

 or small clusters of nodes, while on the medial side it shows 

 definite connections with the kinetosomes of the infundibular 

 ciliature. From the base of each kinetosome a bundle of connect- 

 ing filaments extends toward the main fiber; nodes are arranged 

 in parallel rows across this bundle. 



Additional observations by Rouiller and Faure-Fremiet (1958b) 

 have to do with the ciliary apparatus of Opbrydhtm versatile, in 



