EXPLANATION OF PLATE XLIV. 



Fig. 



I, 2. Stichotricha secunda, Perty, vol. ii. p. 776.— i, Zooid projecting from its 



mucilaginous sheath ; 2, isolated animalcule in ventral aspect, x 250 



(Stein). 



3. Stichotricha aculeata, Wrz., vol. ii. p. 777. — Ventral aspect x 500 (Wrzes- 

 niowski). 



4-8. SCHIZOSIPHON SOCIALIS, Gruber sp., vol. ii. p. 778. — 4, pendent dichotomously 

 branching colony-stock or zoothecium with terminally enclosed zooids, X 60 ; 

 5, an isolated animalcule, x 240; 6, an example dividing by transverse fission 

 within its tube ; 7, termination of tube temporarily occupied by two zooids ; 

 8, a colony-stock, natural size (Gruber). 



9, 10. Stichotricha remex, Hudson, vol. ii. p. T]"]. — 9, Animalcules projecting in 

 various positions from their cylindrical sheaths, x 40 ; 10, an isolated zooid, 

 X 150 (C. S. Hudson). 



11. Stichotricha cornuta, C. & L., vol. ii. p. 776. — Zooid in ventral aspect, x 



400 (Claparede & Lachmann). 



12. Oxytricha tubicola, Gruber, vol. ii. p. 789. — Zooid enclosed within its tube, 



X 200 (Gruber). 



13, 14. STiCHOCH.ffiTA pediculiformis, Cohn, vol. ii. p. 775. — 13, Ventral, and 14, 

 lateral aspects, x 500 (Cohn). 



15, 16. Amphisia gibba var. crassa, C. & L. sp., voLii. p. 768. — Ventral, and lateral 

 aspects, X 200 (Claparede & Lachmann). 



17, 18. Oxytricha scutellum, Cohn, vol. ii. p. 788.— Extended and contracted zooids, 

 X 360 (Cohn). 



19, 20. Oxytricha .aeruginosa, Wrz., vol. ii. p. 787.— 19, Ventral and 20, lateral 

 aspects, X 150 (Wrzesniowski). 



21. HOLOSTICHA OCULATA, Meresch. sp., vol. ii. p. 770. — Ventral aspect, dimensions 



unrecorded (Mereschkowsky). 



22. EuPLOTES harpa. Stein, vol. ii. p. 799.— Ventral aspect, x 150 (Stein). 



23-25. EuPLOTES PATELLA, Ehr., vol. ii. p. 798.-23, Dorsal, and 24, ventral aspects, x 

 200 (after Stein) ; 25, lateral aspect (Dujardin). 



26-29. EUPLOTES CHARON, Miill. sp., vol. ii. p. 799. — 26, Ventral view, x 300 ; 27, 

 example dividing by transverse fission ; 28, encysted zooid (Stein). 



30, 31. Styloplotes appendicularis, Ehr. sp., vol. ii. p. 800.— Dorsal and ventral 

 aspects, X 300 (Stein). 



