240 CILIATE FIBRILLAR SYSTEMS 



type) are connected to the rest of the body rows by commhsural fibrils, 

 thus uniting the peristomiai ciha with the rest of the body ciHa. 



Methods 



Fixative: Schaudinn's (60° C). 

 Stain: Heidenhain's iron haematoxylin. 



Haptophrya michiganensis Woodhead (Bush 1934). — Haptophrya 

 michiganensis has an integrated system of fibrils that center in a moto- 



ph. sir. WC, 



I if. fib. 

 ^-z---ph.fib. 

 /?. mot. 



Figure 86. Eupoterion pernix, optical section. (MacLennan and Connell, 1931.) 



a. c. fib. — anterior connective fibril n. mot. — neuromotorium 



b. gr. — basal granule ph. fib. — pharyngeal fibril 

 cyto. — cytostome ph. str. — pharyngeal strand 

 ectopl. — ectoplasm tr. fib. — transverse fibril 



rium. Within the sucker at the anterior end is a fibrillar ring, homologous 

 with the esophageal ring of stomatous ciHates. The uiolovium is located 

 in the center of this ring and is connected with it by radial connectives. 

 Accessory bodies of the motoriuni are suspended from various points on 

 the inner edge of the ring. (These are not evident during fission.) Nu- 

 merous myonemes radiate from the inner edge of the fibrillar ring and 

 extend to the opposite walls, posteriorly and laterally, dividing into 

 fine fibrils at their outer ends. Equally spaced peripheral myonemes arise 

 from the external edge of the fibrillar ring, adhere to the inner layer of 



