EXPLANATION OF PLATE XLIIL 

 Fig. 



1-3. PsiLOTRiCHA ACUMINATA, Stein, vol. ii. p. 762.— I, Ventral, 2, dorsal, and 3, 

 lateral aspects, x 300 (Stein). 



4-5. Kerona polyporum, Ehr., vol. ii. p. 763. — Ventral and dorsal aspects, x 200 

 (Stein). 



6-8. Urostyla grandis, Ehr., vol. ii. p. 765. — 6, Elongate example in ventral aspect ; 

 7, shorter zooid, dorsal view, x 100 ; 8, encysted zooid (Stein). 



9-10, Uroleptus mobilis, Eng., vol. ii. p. 781. — Extended and contracted examples, 

 X 150 (Engelmann). 



11. HOLOSTICHA MYSTACEA, Stein sp., vol. ii. p. 769.— Ventral aspect, x 150 (Stein). 



12. Amphisia pernix, Wrz. sp., vol. ii. p. 768.— Ventral aspect, x 300 (Wrzesniowski). 



13. Onychodromus grandis, Stein, vol. ii. p. 766.— Ventral aspect, x 150 (Stein). 



14. Uroleptus musculus. Mull, sp., vol. ii. p. 779.— Ventral aspect, x 150 (Stein). 



15. Amphisia gibba, MUU. sp., vol. ii. p. 767.— Ventral aspect, x 200 (Stein). 



16. Gastrostyla Steinii, Eng., vol. ii. p. 784.— Ventral aspect, x 200 (Engelmann). 



17. Holosticha rubra, Ehr. sp., vol. ii. p. 770. — Ventral view, x 300 (Cohn). 



18. Uroleptus violaceus, Stein, vol. ii. p. 781. — Ventral aspect, x 200 (Stein). 



19, 20. Holosticha flava, Cohn sp., vol. ii. p. 769. — 19, Lateral, and 20, ventral aspects, 

 X 250 (Cohn). 



21. Uroleptus piscis, Miill. sp., vol. ii. p. 780. — Ventral aspect, x 100 (Stein). 



22. Pleurotricha echinata, C. & L. sp., vol. ii. p. 783.— Ventral aspect, x 300 



(Claparede & Lachmann). 



23, 24. Epiclintes retractilis, C. & L. sp., vol. ii. p. 774. — 23, Extended, and 24, con- 

 tracted conditions, ventral view, x 500 (ClaparMe & Lachmann). 



25. Plagiotricha affinis, Stein sp.,vol. ii. p. 772.— Ventral aspect, x 300 (Stein). 



26, 27. Pleurotricha lanceolata, Ehr. sp., vol. ii. p. 783.— Ventral aspect, x 150; 

 27, encysted zooid (Stein). 



28-30. Epiclintes auricularis, C. & L. sp., vol. ii. p. 773. — 28, Ventral view ; 29, 

 repent animalcule in lateral aspect, x 200 (after Claparede & Lachmann ; 

 30, anterior region more highly magnified, as delineated by Mereschkowsky. 



31, 32. Epiclintes radiosa, Quenn. sp., vol. ii. p. 774. — 31, Dorsal, and 32, lateral 

 aspects, X 300 (Quennerstedt). 



33. Uroleptus rattulus, Stein, vol. ii. p. 780. — Ventral aspect, x 150 (Stein). 



34. Plagiotricha strenua, Eng. sp., vol. ii. p. 772. — Ventral view, x 180 



(Engelmann). 



35. 36. Opisthotricha parallela, Eng. sp., vol. ii. p. 785.-35, Dorsal, and 36, 

 ventral aspects, x 150 (Engelmann). 



