EXPLANATION OF PLATE XXXIV. 

 Fig. 



1. Rhabdostyla ringens, From, sp., vol. ii. p. 666, x 150 (DeFromentel). 



2. SCYPHIDIA INCLINANS, D'Udk. sp., vol. ii. p. 659. — a, Extended, and b, con- 



tracted zooid, dimensions unrecorded (D'Udekem). 



3, 4. Rhabdostyla sertularium, S. K., vol. ii. p. 665.-3, Short-stalked, and 4, long- 

 stalked varieties, 3 x 300. 



5, 6. Rhabdostyla ovum, S. K., vol. ii. p. 664. — Expanded and contracted zooids, 

 X 250. 



7. Pyxidium cothurnoides, S. K., vol. ii. p. 667, X 350. 



8. Rhabdostyla brevipes, C. & L. sp., vol. ii. p. 665, x 300 (Claparfede & Lach- 



mann. 



9. Pyxidium inclinans, Miill. sp., vol. ii. p. 667. — a, Expanded, and b, contracted 



zooids, X 250 (De Fromentel). 



10. Rhabdostyla spHjEroides, From., vol. ii. p. 666, x 200 (De Fromentel). 



11,12. Rhabdostyla nebulifera, From., vol. ii. p. 665. — 12, Example dividing by 

 longitudinal fission, x 100 (De Fromentel). 



13, 14. Vorticella brevistyla, D'Udk., vol. ii. p. 675. — 13, a. Expanded, and b, con- 

 tracted zooid, X 200; 14, encysted example (D'Udekem). 



15-19. Vorticella striata, Duj., vol. ii. p. 684. — 15, Two zooids, the one with a 

 lateral gemmulethe product of longitudinal fission, x 300 ; 16-19, successive 

 phases of detached germ, resulting in the last instance in the attachment and 

 development of a pedicle. 



20, 21. Vorticella nebulifera, Ehr., vol. ii. p. 673. — 20, Social group, showing at 

 a and b successive phases of longitudinal fission, and at c contracted zooid 

 with conjugating germ, x 200; 21, free-swimming zooid the product of longi- 

 tudinal fission (D'Udekem). 



22. Vorticella cratera, S. K., vol. ii. p. 679. — Expanded and contracted zooid, 

 X 250 (D'Udekem). 



23, 24. Vorticella putrinum, Miill., vol. ii. p. 6S4. — 23, Expanded and contracted 

 zooid, the latter at a, two basaUy attached migrant zooids, the product of 

 repeated longitudinal fission, x 300 ; 24, free-swimming migrant zooid (fine 

 cross-striation of the cuticle accidentally omitted by the artist). 



25,26. Vorticella crassicaulis, S. K., vol. ii. p. 676. — a a. Extended, and bb, con- 

 tracted zooids, X 300. 



27. Vorticella hamata, Ehr., vol. ii. p. 687.— a. Expanded, and b, contracted 



zooids, X 300. 



28. Vorticella nutans, Miill., vol. ii. p. 679, x 300. 



29. Rhabdostyla longipes, S. K., vol. ii. p. 666. — At b fidly contracted zooid, x 200. 



30. Vorticella longifilum, S. K., vol. ii. p. 677, x 200. 



31, 32. Vorticella telescopica, S. K., vol. ii. p. 677.— 31, Extended, and 32, con- 

 tracted zooid, X 250. 



33. Vorticella alba, From., vol. ii. p. 676. — At a example with rudimentary 



pedicle, b contracted zooid, x 200. 



34. Vorticella quadrangularis, S. K., vol. ii. p. 685.— At b contracted zooid, 



X 125. 



35. Vorticella spectabilis, S. K., vol. ii. p. 687.— Social group, x 100. 



36. Vorticella campanula, Ehr., vol. ii. p. 678. — At a expanded example, with 



the cuticle irregularly puckered, at b contracted zooid, x 100. 



