PLATE 4 



Diplodinium ecaudatum forma ecaudatum Fiorentini 



(Fixed in Zenker's fluid and stained with modified Mallory's connective 

 tissue stain. Camera lucida drawings, colored to match the stain.) 



Fig. 3. Median sagittal section constructed from superimposed camera lucida 

 drawings from three sections, each 5 microns thick. X 1500. Compare with 

 microphotographs, plate 6, figures 12-18, and plate 7, figure 33. 



Fig. 4. Cross-section through region of dorsal membranelle zone from three 

 sections, each 6 microns thick. X 1500. Compare with microphotographs, plate 

 7, figures 23-25. 



Fig. 5. Cross-section (same series as fig. 4) through the micronueleus (cf. 

 fig. 3). X 1500. Compare with microphotograph, plate 7, figure 29. 



ABBREVIATIONS 



ador. m. adoral membranelles. In figure 

 3 the leader is carried beyond the mem- 

 branelle. 



an. anus. 



ant. cil. r. anterior ciliary roots. 



ant. c. v. anterior contractile vacuole. 



bd. 1. boundary layer (ectoplasmic). 



dr. oes. r. circumeosophageal ring. 



caec. caecum. 



cut. cuticle. 



c. v. r. region about contractile vacuole. 

 D. dorsal side of body. 



d. disk dorsal disk. 



d. fur. dorsal furrow. 



d. m. str. dorsal motor strand. 



d. m. dorsal membranelles. 



ect. ectoplasm. 



ent. entoplasm. 



fd. vac. food vacuoles. 



i. ador. lip inner adoral lip. 



i. d. lip inner dorsal lip. 



L. left side of body. 



1. sic. a. left skeletal area. 



mac. macronucleus. 



mic. micronueleus. 



m. m. motor mass (motorium). 



o. ador. fur. outer adoral furrow. 



o. ador. lip outer adoral lip. 



o. d. fur. outer dorsal furrow. 



o. d. lip outer dorsal lip. 



oes. oesophagus or cytopharynx. 



oes. f. oesophageal fibers. 



oes. retr. str. oesophageal rectrator 



strands. 



op. operculum. 

 op. f. opercular fibers. 

 or. oral opening, mouth, or cytostome. 

 or. cil. oral cilia. 

 or. disk oral disk. 

 post. cil. r. posterior ciliary roots. 

 post. c. v. posterior contractile vacuole. 

 JR. right side of body. 

 rect. rectum. 

 red. f. rectal fibers. 

 r. sk. a. right skeletal area. 

 sk. lam. skeletal laminae. 

 susp. f. suspensory fibers. 

 V. ventral side of body. 

 v. and r. sk. lam. ventral and right 



skeletal laminae. 

 v. sk. a. ventral skeletal area. 

 11. m. nuclear membrane. 



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