EXPLANATION OF PLATE XLIII. 



FIG. 



1-3. PsiLOTRlCHA 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, Mull, 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). 



1 8. 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, Mull, sp., vol. ii. p. 780. Ventral aspect, x 100 (Stein). 



22. PLEUROTRICHA KCHINATA, 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 (Claparede & 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). 



