PLATE XLVL 



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^EROPHRYA UROSTYUE, 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^EROPHYRA PUSILLA, C. & L., vol. ii. p. 808, x 150 (Claparede & Lach- 



mann). 

 7-9. SPH^EROPHRYA STENTOREA, Maupas, vol. ii. p. 808, x 2oo (Stein). 



10, ii. TRICHOPHRYA DIGITATA, Stein sp., vol. ii. p. 812. 10, Adult animalcule, x 300 ; 

 n, 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 1 6, ciliated embryos ; 17, earliest phase of fixed condition (Stein). 



1 8. PODOPHRYA QUADRIPARTITA, C. & L., vol. ii. p. 820. Two examples attached 

 to stalk of 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 Fix A, Miill. sp., vol. ii. p. 813. 24, Adult animalcule containing at 

 a a ciliated 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 Sphaerophrya-like embryo. 



36-39. ACINETA LINGUIFERA, C. & L., vol. ii. p. 831. 36 and 37, Adult zooids, front 

 and profile views, x 150; 38, empty lorica ; 39, ciliated embryo (Stein). 



