EXPLANATION OF PLATE XXXVIII. 



Fio. 



1-5. EPISTYLIS FLAVICANS, Ehr., vol. ii. p. 702. Adult erect colony-stock, with at 

 rr rosette-like groups of microzooids produced through the repeated seg- 

 mentation of the ordinary animalcules ; at k k detached microzooids laterally 

 adherent to and conjugating with ordinary sedentary animalcules, x 100, after 

 Greeff (as originally delineated by Greeff, the right-hand half of the colony is 

 alone portrayed, the left one has been filled by the author, in keeping- with 

 the same, for the purpose of symmetry) ; 2, decumbent colony-stock ; 3, zooid 

 after death, the cilia having fallen away, but showing concentric lines of ciliary 

 circlets ; 4 and 5, trichocyst-like bodies, as delineated by Greeff, x 600. 



6-8. EPISTYLIS PLICATILIS, Ehr., vol. ii. p. 701. 6, Adult colony-stock, x 150; 

 at a a commensally attached Flagellata, Monosiga; 7 and 8, contracted 

 zooids, x 200. 



9. EPISTYLIS UMBILICATA, C. & L., vol. ii. p. 706, x 250 (D'Udekem). 



10, ii. EPISTYLIS COARCTATA, C. & L., vol. ii. p. 706. 10, Colony-stock, as delineated 

 by Claparede & Lachmann, x 150 ; ii, more luxuriant colony, as figured by 

 H. J. Slack ; at a an apparently encysted zooid. 



12-16. EPISTYLIS DIGITALIS, Ehr., vol. ii. p. 704. 12, Adult colony-stock, x 150; 13, 

 isolated zooid, x 300; 14, contracted zooid; 15 and 16, migrant zooids de- 

 tached from the parent stock, that at 16 progressing on the ground after the 

 manner of a Trichodina. 



17. EPISTYLIS STEINII, Wrz., vol. ii. p. 708, x 3oo'(Wrzesniowski). 



18. EPISTYLIS NYMPHARUM, Eng., vol. ii. p. 708. Isolated zooid, x 160 (Engelmann). 



19-22. EPISTYLIS ANASTATICA, Linn, sp., vol. ii. p. '701. 19, Colony-stocks attached to 

 limbs of Cyclops, x 100 ; 20, isolated zooid, X 300; 21, contracted animal- 

 cule. Cyclops with numerous colony-stocks attached, x 10. 



