CILIATE FIBRILLAR SYSTEMS 229 



Klein's silver method, modified to include fixation with osmic acid fumes 

 and impregnation period of one to three hours in 2-percent solution of 

 silver nitrate. 



Boveria teredinidi Nelson (Pickard, 1927). — Surrounding the cyto- 

 stome is an oral ring which begins and ends in the motorium. From the 

 motorium arise the anterior and the posterior adoral fibrils, which bound 

 the adoral zone. The posterior fibril joins the anterior fibril distally, 

 and the latter continues as the pharyngeal fibril. This enters the endo- 

 plasm in the region of the pharynx and spirals around the potential gul- 

 let. A fibril from a point on the ring opposite the motorium enters the 

 pharyngeal fibril near the margin of the peristome. Within the peristomal 

 field delicate fibrils connect the anterior adoral fibril with the ring. 



The longitudinal lines of the body surface consist of contractile Jiiyo- 

 nemes and basal granules of the ciliary rows. Myonemes arise at the 

 anterior end directly from the posterior adoral fiber, or indirectly from 

 fibrils of the posterior granular line. The myonemes pass posteriorly and 

 in somewhat oblique parallel lines. They gradually converge in the pos- 

 terior field. Basal granules of cilia rest on tnyonemes, oral ring, and the 

 anterior and posterior adoral fibrils (except the free end of anterior 

 adoral fibril) . A deep nerve net, consisting of longitudinal interstrial and 

 transverse fibrils, interconnect the area "between the myonemes and 

 their basal granules." 



Methods 



Fixatives: Schaudinn's (60° C), Bouin, Zenker, formalin, osmic acid, 



Da Fano. 

 Stains: Delafield's iron haematoxylin, Mallory's triple, alum carmine, and 



Yabroff's silver-gold method. 

 Clearing: Xylol, oil of cedar; equal parts of bergamot, oil cedar, and 



phenol, and sometimes before imbedding, in synthetic oil of wintergreen. 



Chlamydodon sp. nov. (MacDougall, 1928). — The structural analysis 

 of this new species of Chlamydodon disclosed "a complex neuromotor 

 apparatus, including a coordinating center, and systems of fibers con- 

 nected with cilia, the mouth opening, the pharyngeal basket, and the 

 'railroad track.' " 



The motorium was identified as a bilobed mass located just below the 

 anterior end of the large pharyngeal basket. This mass and all the 



