232 CILIATE FIBRILLAR SYSTEMS 



The fused basal elements of the large oral brush of cilia form a deeply 

 staining band or plate at right angles to the long axis of the motorium. 

 From its anterior end two fibrils are given off which join the anterior 

 and middle oral brush plates. Fine fibrils arise from the basal elements 

 of the large oral brush line of the cytopharynx and connect with the 

 motorium along its anterior side. Finally, a ventral peristomal fiber runs 

 under the basal plate of the long ventral peristomal cilia, curves slightly 

 to the outside, and ends just anterior to the oral brush. 



The brushes of cilia about the mouth seem to connect directly with the 

 motorium but not with the peristomal fbers. This lack of connection is noted 

 in the movements of the cilia, the peripheral and peristomal cilia beating 

 regularly, continuously and metachronously while the beating of the oral 

 brushes is non-continuous and synchronous. 



Methods 



Fixatives: Flemming's, Zenker's (for whole mounts), Bouin's, Zenker's, 



strong Flemming's (for sections). 

 Stains: Heidenhain's haematoxylin, Mallory's triple. 



Conchophthirus (Kidder, 1934). — The "well integrated and closely 

 interconnected neuromotor systems" of three species of Conchophthirus 

 — C. anodontae Stein, C. curtus Engl., and C. magna sp. nov. — are quite 

 comparable. The description is given of the external, internal, and peri- 

 stomal fibrillar complexes, with reference especially to C. magna. 



Most of the numerous, closely set ciliary rows originate in an antero- 

 ventral suture and terminate in a dorsal suture near the posterior end. 

 The ventral suture comprises two fibrils which are united at their ends 

 and are connected irregularly by cross fibrils. This ventral suture is con- 

 tinued posteriorly as the pre-orat connecting fiber, from which arise two 

 fibrils: (1) connecting the rows of basal granules of the dorsal lip, and 

 (2) connecting the basal granules of the pharyngeal ciliary row. 



The pre-oral connecting fiber itself becomes the peristomal net fiber. 

 The latter gives off secondary fibrils to the peristomal field. On the left, 

 these secondary fibrils are bounded by a longitudinal inner net fiber 

 (Fig. 82) from which arise numerous fine fibrils that line the ventral 

 side of the peristomal basket. On the floor of this basket, these fine fibrils 

 join the inner basket fiber, which, in turn, gives off many branches that 

 line the dorsal surface of the basket. These branches then unite with the 



