ADVANCE IN LOWER PLANT AND ANIMAL FORMS 



77 



PLATE LXXIV 



PLATE LXXIV {continued) 



Figs. 15 and 17. — Supposed immature examples of Trichonympha agilis, x 500 (Leidy). Bodies elongate ovate^ covered with 

 four sets of cilia, the longest cilia being spirally arranged. Show beautiful double right and left-handed spiral markings remarkably 

 resembling those seen in the fir-cone, j)ine-apple, &c. Compare with Plate xi., Fig. 1, and Plate xxiii., Fig. 1. The appearance of spiral 

 markings and arrangements in immature simple forms furnishes another proof of the fundamental nature of the spiral in organic beings 

 (the Author). 



Fig. 16. — Animalcule (Pyrsonema vertens) also showing double spiral markings, i, Ingested food particles, x 666 (Leidy). The 

 cilia in this case are apparently absent ; the body presenting a more or less contorted membranous appearance. 



Fig. 18. — Ciliated animalcule with ingested food particles of wood fibre (i), showing curious undulating cord-like structures 

 (ch), X 666 (Leidy). 



Fig. 19. — Animalcule (Follicidina ampulla) with ornamented lorica, x 200 (Stein). Shows spiral and segmented structures ; the 

 spirals occurring in neck and peristomal lobes of animalcule ; the segmentation or circular markings in the adult sheath or lorica on 

 animalcule. 



Fig. 20. — Nyctotlierus cordiformis. Body kidney-shaped, ciliated and marked with longitudinal striations. n, Nucleus ; cv, con- 

 tractile vesicle ; ph, vestibulum of pharynx ; an, anal aperture, x 150 (Stein). 



Fig. 21. — Ornamental adult sheath or lorica of animalcule (FoIHculiiia ampulla), x 200 (Stein). Shows elegant flask shape ; the 

 neck presenting annular rings or segmentations. 



Fig. 22.— Attached fully extended animalcule (Stentm- igneus), x 70. At Figs. 28 and 29 examples are given of the same 

 animalcule in the free or swimming condition, n. Nucleus ; cv, contractile vesicle. Show curved, spiral arrangement of the cilia. 



Fig. 23.—Stentor pedmdatus, x 250. n, Nucleus ; cv, contractile vesicle (De Fromentel). Body trumpet-shaped when extended, elon- 

 gate ovate when contracted. Expanded peristome circular, slightly spiral, and covered with cilia. Contains numerous raised papillse 

 with fine hair-like setae ; the posterior adherent extremity is provided with six digitiforiu prolongations and four fine setse each. 



Figs. 24 and 26.— Lateral and ventral views of Trirhodina seorpmmi, x 400 (Roliin). Body turban-shaped, convex above, concave 

 below, supplied with two wreaths of cilia and having armature of acetabulum. Fig. 25 shows beautiful concentric, curved, and 

 radiating arrangements. 



Fig. 25.— Normal zooid with elegant flask-shaped protective covering or lorica (Tintinmis lagenvla), x 300 (Clap, and Lach.), 

 The zooid is provided with brush-shaped tuft of cilia. 



Fig. 27.— Coiiically contracted animalcule {Triclwdina pediculus) showing oral aperture (or) as drawn by Busch. 



Figs. 28 and 29.— Free-swimming animalcules (Stenfor igneus). n, Nucleus ; cr, contractile vesicle, x 70. See under Fig. 22, 

 VOL. I. Z 



