452 MR. P. H. GOSSE ON THE MANDUCATORY ORGANS IN THE CLASS ROTIFERA. 
Fig. 51. Diglena forcipata : the same, opened. 
Fig. 52. Alhertia vermiculus : jaws ; ventral aspect. 
Fig. 53. Albertia vermiculus : the same ; lateral aspect. 
Fig. 54. Furcularia marina : head, with the jaws protruded. 
Fig. 55. Furcularia marina : jaws. 
Fig. 56. Asplanchna priodonta : the anterior third of the animal. 
Fig. 57- Asplanchna priodonta : jaws, closed ; frontal aspect. 
Fig. 58. Asplanchna priodonta : the same, opened. 
Fig. 59. Asplanchna priodonta ; right jaw, interior surface ; lateral aspect. 
Fig. 60. Mastigocerca carinata : mastax, &c. ; dorsal aspect. 
Fig. 61. Mastigocerca carinata % the same ; lateral aspect. 
Fig. 62. Mastigocerca carinata : jaws, after potash-treatment ; ventral aspect. 
Fig. 63. Monocerca porcellus : jaws ; ventral aspect. 
Fig. 64. Scaridium longicaudum : the head ; showing the large ganglion, with the eye 
pressing on the mastax ; lateral aspect. 
Fig. 65. Scaridium longicaudum : the lips opened, and the rami protruded. 
/3, Rugae on mastax. 
y. Setse of labrum. 
Bifid labium. 
£. Projectile setae of ramus. 
Fig. 66. Limnias ceratophylli : mastax and jaws ; with the termination of the buccal 
funnel ; and the commencement of the oesophagus ; dorsal aspect. 
Fig. 67. Limnias ceratophylli : the same ; lateral aspect. 
Fig. 68. Limnias ceratophylli : jaws, after potash-treatment ; lateral aspect. 
Fig. 69. Limnias ceratophylli ; the same ; showing the elevation of the mallei. 
Fig. 70. Limnias ceratophylli'. the same ; obliquely- ventral aspect. 
Fig. 71. Limnias ceratophylli : the same ; frontal aspect. 
Fig. 72. Rotifer macrurus : mastax, &c. ; dorsal aspect. 
Fig. 73. Rotifer macrurus : jaws, after potash-treatment ; fronto-dorsal aspect. 
Fig. 74. Rotfer macrurus'. the same; frontal aspect. 
Fig. 75. Rotifer macrurus: the same; lateral aspect. 
Figs. 76, 77 i 78. Rotifer macrurus: diagrams, to illustrate the changes of form in the 
quadrantic jaws. Quadrantic masses. 
Fig. 79. Floscularia ornata: veil, or septum, in crop. 
Fig. 80. Floscularia ornata : jaws ; dorsal aspect. 
Fig. 81. Floscularia ornata: the same; frontal aspect. 
Fig. 82. Floscularia ornata : the same, closed. 
Fig. 83. Stephanoceros Eichhornii : jaws ; dorsal aspect. 
Fig. 84. Stephanoceros Eichhornii : uncus ; frontal aspect. 
Fig. 85, Stephanoceros Eichhornii : the same ; oblique aspect. 
