PLATE 44. -Rotate ria. 



Figure 



1 . Megalotrocha flavicans. 



2. Megalotrocha flavicans, jaws. 



3. Melicerta ringens. 



4. Melicerta ringens, removed from its sheath, a, rotatory lobes ; b, lips ; c, 



accessory ciliated lobe ; d, tentacular processes ; c, pharynx or oesophagus 

 and jaws ; /, g, upper and lower stomach ; h, anus ; Jc, ovary ; Z, oviduct ; 

 m, spermatic organ ? ; n, tail ; o, disk ; p, sarcodic globules ; q, ovum. 



5. Melicerta ringens, tentacular process of. a, setae ; b, conical body ; c, muscle. 



6. Melicerta ringens, jaws of. 



7. Metopidia triptera. a, contractile sac. 



8. Microcodon clavus. 



9. Monocerca rattus. a 9 contractile sac ; 6, muscle. 



10. Monolabis gracilis. 



11. Monostyla quadridentata. 



12. Monura dulcis. 



13. Noteus quadricornis. 



14. Notommata centrum. 



15. Notommata centrum, jaws of. 



16. (Ecistes crystallinus. 



17. Philodina eryihrophihalma. 



18. Pleurotrocha gibba. 



19. Polyarthra platyptera. 



20. Pterodina patina. 



21. Ptygura melicerta. 



22. Rattulus lunaris. 



23. Rotifer vulgaris. a, contractile sac. 



24. Salpina redunca, dorsal view. 



25. Stephanoceros Eichhornii. a, tremulous bodies. 



26. Synchceta baltica. 



27. Scaridium longicaudum. 



28. Stephanops cirratus. 



29. Squamella oblonga. 



30. Triarthra longiseta. 



31. TriopTifhalmus dorsalis. 



32. Theorus vernalis. 



33. Typfilina viridis. 



