172 DR. T. S. COBBOLD ON ENTOZOA. 



Fig. 73 . Three examples of Taenia serrata of about seventy hours' growth. Natural size. 



Fig. 74. Head of one of the above. Magnified 10 diameters. 



Fig. 75- Tania cucummna. Natural size. 



Fig. 76. Head of the same, enlarged 25 diameters. 



Fig. 77- Joints of the same, showing the male reproductive organs opening at both of the lateral margins, 



also the ova and water-vascular canals. Magnified 25 diameters. 

 Fig. 78. Male organs, consisting of testes and vas deferens, and the penis retracted within its sheath. 

 Magnified 60 diameters. 



Fig. 49. Head and anterior segments of Diphyllobothrium stemmacephalum. Natural size. 



Fig. 80. Section from near the centre of the body. Natural size. 



Fig. 81. Head and neck, enlarged 100 diameters. 



Fig. 82. Lateral or marginal view of the same. 



Fig. 8.S. Appearance of the bothria when viewed from above. 



Fig. 84. Campula oblonga. Natural size. 



Fig. 85. The same enlarged 20 diameters, exhibiting more particularly the peculiar zigzag conformation 

 of the digestive caeca. 



