OF THE MANDUCATORY ORGANS IN THE CLASS ROTIFERA. 
451 
Fig. 16, Notommata aurita-. mastax, &c. ; ventral aspect. 
Fig. 17. Notommata aurita: the same ; lateral aspect. 
Fig. 18. Notommata aurita \ the same ; fronto-ventral aspect. 
Fig. 19. Notommata aurita: the same; frontal aspect. 
Fig. 20. Notommata aurita : malleus. 
Fig. 21. Notommata aurita: incus, opened ; with labrum. 
Fig. 22. Notommata clavulata : ganglion, with its eye and nervous chords, mastax, 
jaws, oesophagus, pancreatic glands, and commencement of stomach ; 
lateral aspect. 
Fig. 23. Notommata clavulata : mastax, &c, ; ventral aspect. 
Fig. 24. Notommata clavulata: the same, opened. 
Fig. 25. Notommata clavulata: mallei and incus, after potash-treatment; viewed 
frontally. 
Fig. 26. Notommata clavulata : right malleus. 
Fig. 27. Notommata petromyzon: the head, with the ganglion, mastax, jaws, (BSo- 
phagus, stomach, and various muscles. 
Fig. 28. Notommata petromyzon: mastax; ventral aspect. 
Fig. 29. Notommata petromyzon: the same ; fronto-ventral aspect. 
Fig. 30. Notommata petromyzon : the same ; frontal aspect. 
Fig. 31. Notommata petromyzon: the same ; lateral aspect. 
Fig. 32. Notommata lacinulata : jaws ; ventral aspect. 
Fig. 33. Notommata lacinulata: the same; fronto-ventral aspect. 
Fig. 34. Notommata lacinulata: mastax, &c.; lateral aspect. 
Fig. 35. Furcularia gibha: jaws, closed ; latero-ventral aspect. 
Fig. 36. Furcularia gibha: the same, opened. 
Fig. 37. Furcularia gibba: mastax, &c.; lateral aspect. 
Fig. 38. Notommata gibba : the head ; dorsal aspect. 
Fig. 39. Notommata gibba: jaws ; nearly a ventral aspect. 
Fig. 40. Notommata gibba : one ramus ; designed from study of various aspects. 
Fig. 41, Synchceta tremula : mastax and jaws ; ventral aspect. 
Fig. 42. Synchceta tremula : the same, after potash-treatment ; expanded under 
pressure. 
Fig. 43. Synchceta tremula : jaws ; lateral aspect. 
Fig. 44. Polyarthra platyptera : mastax ; ventral aspect. 
Fig. 45. Polyarthra platyptera: the same ; dorsal aspect ; with the oesophagus, pan- 
creatic glands, and stomach. 
Fig. 46. Polyarthra platyptera : mastax and jaws ; ventral aspect. 
Fig. 47. Polyarthra platyptera: the same, after potash-treatment ; lateral aspect. 
Fig. 48. Polyarthra platyptera : jaws ; viewed obliquely. 
Fig. 49. Polyarthra platyptera : the same ; frontal aspect. 
Fig. 50. Diglena forcipata : jaws, closed ; ventral aspect. 
3 o 
MDCCCLVI. 
