PLATE XXXI I L 



EXPLANATION. 

 Fig, 



1-6. Gyrocoris OXYURA, Stein, vol. ii. p. 640. — i, Adult, and 2, 3, undeveloped zooids, 

 X 300 (after Tatem) ; 4-6, adult animalcules as delineated by Eberhard. 



7-10. Urocentrum turbo, Miiller sp., vol. ii. p. 641. — 7 and 8, Free-swimming and 

 posteriorly adherent zooids, X 300; 9, an example dividing by transverse 

 fission ; 10, a-f., showing consecutive contours exhibited by the contractile 

 vesicle. 



11-13. Telotrochidium crateriforme, Miill. sp., vol. ii. p. 643. — II, Normal ex- 

 ample, X 200 ; 12, zooid with abruptly truncate posterior border ; 13, 

 example dividing by longitudinal fission. 



14-18. Trichodina pediculus, Ehr., vol. ii. p. 646.— 14-16, Lateral and ventral aspects 

 X 300 (after Stein) ; 17, denticles of adherent disc (after Quennerstedt) ; 

 18, the same structures as interpreted by the author; ex. external, and 

 m. internal elements, X 800. 



19-21. Trichodina baltica, Quenn., vol. ii. p. 649.— 19 and 20, Lateral and ventral 

 views, X 350; 21, denticles of adherent apparatus more highly magnified 

 (Quenn.). 

 22. Urceolaria mitra. Stein, vol. ii. p. 650, x 600 (Stein). 



23, 24. Cycloch/eta SPONGILL^, Jackson, vol. ii. p. 650.— 23, Adult animalcule in 

 profile view, x 400 ; 24, portion of denticulated ring of acetabulum more 

 highly magnified. 

 25. LiCNOPHORA COHNll, ClaparMe, vol. ii. p. 652, x 400 (Cohn). 



26-28. Ccenomorpha medusula, Perty, vol. ii. p. 641, x 150 (Perty). 



29. ASTYLOZOON FALLAX, Eng., vol. ii. p. 654, X 250 (Engelmann). 



30. LiCNOPHORA AUERBACHll, Clap., vol. ii. p. 65 1, X 500 (Cohn). 



31. SCYPHIDIA PHYSARUM, C. & L., vol. ii. p. 658, X 300 (Claparede & Lachmann). 



32. SCYPHIDIA LIMACINA, Lach.,vol. ii. p. 658, X 300 (Lachmann). 



33. SCYPHIDIA RUGOSA, Duj., vol. ii. p. 659.— Expanded and contracted examples, 



X 280 (Dujardin). 



34, 35. Gerda fixa, D'Udk., vol. ii. p. 657.-34, Expanded zooid almost completely 

 divided by longitudinal fission ; 35, contracted example, dimensions un- 

 recorded (D'Udekem). 



36-38. Gerda GLANS, C. & L;, vol. ii. p. 657.-37, An adherent zooid; 38, a free- 

 swimming example with adventitious posterior ciliary circlet, x 150 (Clap. 

 & Lach.). 



