PLA TE XL VI. 



EXPLANATION. 

 Fig. 



1,2. Rhyncheta cyclopum, Zenker, vol. ii. p. 806.— i, Adult animalcule, X 150; 

 2, extremity of single tubular sucker, x 600 (Zenker). 



3-5. Sph^rophrya urostyl^, Maupas, vol. ii. p. 809.— 3, Normal adult zooid ; 4, 

 example dividing by transverse fission, the anterior moiety with temporarily 

 developed cilia ; 5, a zooid elongated and with cilia developed preparatory to 

 subdivision, X 200 (Stein). 



6. Sph^rophyra pusilla, C. & L., vol. ii. p. 808, x 150 (ClaparMe & Lach- 

 mann). 



7-9. Sph^rophrya stentorea, Maupas, vol. ii. p. 808, x 200 (Stein). 



10, II. Trichophrya digitata, Stein sp.,vol. ii. p. 812.— 10, Adult animalcule, x 300 ; 

 II, non-tentaculate germ (Stein). 



12, 13. Trichophrya epistylidis, C. & L., vol. ii. p. 811.— 12, Dorsal; 13, lateral 

 aspects, X 150 (Clap. & Lach.). 



14-17. Podophrya astaci, C. & L., vol. ii. p. 819.— 14, Adult animalcule, x 200 ; 

 15 and 16, ciliated embryos ; 17, earliest phase of fixed condition (Stein). 

 18. Podophrya quadripartita, C. & L., vol. ii. p. 820.— Two examples attached 

 to stalk oi Epistylis plicatilis, x 150 (Stein). 



19-22. Podophrya ferrum-equinum, Ehr. sp., vol. ii. p. 813.— 19 and 20, Front and 

 profile views showing compressed form of body and proportionate size of 

 pedicle, x 100 (after Clap. & Lach.) ; 21, ciliated embryo ; 22, earliest fixed 

 condition possessing only a single tentacle as represented by Zenker. 

 23. Podophrya cyclopum, C. & L., vol. ii, p. 818, x 150. 



24-30. Podophrya fixa, Miill. sp., vol. ii. p. 813.— 24, Adult animalcule containing at 

 a a ciHated embryo, X 200; 25, an example dividing by transverse fission; 

 26, conjugation of two adjacent animalcules ; 27, animalcule forming a 

 membranous encystment (Stein) ; 28, encystment as found within body of 

 Stylonychia mytilus (Engelmann) ; 29 and 30, ciliated embryos. 



31. Podophrya Wrzesniowskii, S. K., Stein sp., vol. ii. p. 817, x 150 (Wrzes- 

 niowski). 



32-35. Acineta stellata, S. K., vol. ii. p. 838.— 32, Adult animalcule, x 1000; 33 and 

 34, encysted examples, the body contents in the first instance divided into 

 two equal halves ; 35, free-swimming Sphserophrya-like embryo. 



36-39. Acineta linguifera, C. & L., vol. ii. p. 831.— 36 and 37, Adult zooids, front 

 and profile views, x 1 50 ; 38, empty lorica ; 39, ciliated embryo (Stein). 



