PLATE 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. SPHyEROPHRYA UROSTYL.E, 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/ER0PHYR,4 pusilla, C. & L., vol. ii. p. 808, x 150 (ClaparMe & Lach- 

 mann). 

 7-9. Sph^erophrya stentorea, Maupas, vol. ii. p. S08, 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, earhest phase of fixed condition (Stein). 



18. PODOPHRYA QUADRIPARTITA, C. & L., vol. ii. p. 820. — Two examples attached 

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



19-22. PODOPHRYA FERRUM-EQUINUM, Ehr. sp., vol. ii. p. 8 1 3. — 19 and 20, Front and 

 profile views showing compressed form of body and proportionate size of 

 pedicle, x 100 (after Clap. & Lach.) ; 21, ciHated 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 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 Sphxrophrya-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). 



