30 



General Morphology of the Protozoa 



H). In addition, dorsal and lateral fibrils extend forward in the peri- 

 stomial cortex and, by their contractions, produce undulations of the 

 cortex near the cytostome. Both sets extend, as the postoesophageal fibrils, 

 past the base of the pharynx and deep into the cytoplasm, their move- 

 ments guiding each newly formed food vacuole, much as in Paramecium. 

 The small undulating membrane and the lack of cytostomal fibrils 



ct-l 



Fig. 1. 16. A. Contractile tube of Haptophiya michiganensis; xlOO (after 

 MacLennan). B. Contractile vacuole and pore in Eudiplodinium maggii; 

 x830 (after MacLennan). C. "Sensory" vacuole of Blepharoprosthium; dia- 

 grammatic (after Dogiel). D. Row of "statocysts" in Loxodes rostrum; body 

 cilia omitted; xl60 (after Penard). E. Single "statocyst" of L. striatus; dia- 

 grammatic (after Penard). F. Contractile vacuole and canals in Paramecium 

 miiltimicronucleatum; x720 (after King). G. Contractile vacuole and canals 

 in Tillina canalijera, diagrammatic (after Turner). Key: cp, pellicular cap; 

 ct, cortex; fe, endoplasmic fibril; ^v, fibrils at surface of vacuole; g, granules 

 in vacuole; s, "statocvst." 



