146 
Nerve fibres, 9. 
Nervous system of Rock Starfish, 
43: of Earthworm, 48; of Sea- 
squirt, 52 ; of Cockle, 55 ; of Peri- 
winkle, 60; of Garden Slug, 64 ; 
of Sea Snail, 69; of Shore Crab, 
77; of Stick Insect, 13 ; of Blue- 
bottle Fly, 90; of Sea Mullet, 97. 
Nervous tissue, 9. 
Nervus recurrens, 83. 
Neuroptera, 105, 123. 
Nucleus, 2. 
O 
Objective, 24. 
Odontolee, 115. 
Odontophore, 60, 63, 69. 
Odontotorme, 115. 
(Esophageal glands, 46. 
Olfactory ganglia, 97. 
Olfactory nerve, 97. 
Onychophora, 104. 
Operculum, 58, 66, 93. 
Ophidia, 113. 
Ophiomorpha, 112. 
Optic lobes, 97. 
Optic nerve, 97. 
Ornithodelphia, 118. 
Orthoptera, 105, 124. 
Otoliths, 65, 69. 
Ovotestis, 63, 70. 
Ovum, 6, 38. 
P 
Paleontology, 9. 
Pallial line, 57. 
Pallal sinus, 57, 
Palpi, 56, 78, 84, 90. 
Parthenogenesis, 12, 
Passeres, 116, 
Pectoral fins, 93. 
Pedicells, 42, 
Penis, 68, 70. 
Perisoma, 39. 
Peritoneum, 9d. 
Pharyngobranchii, 110, 
Physiology, 9. 
Physostomi, 111. 
Picariz, 116. 
_ Pisces, 109. 
Plagiostomata, 110, 
INDEX. 
Planula, 6. 
Platyelmia, 101. — 
Plectognathi, 110. 
Podophthalma, 104. 
Polian vesicles, 42, 
Polyzoa, 107. 
Porifera, 99. 
Posterior basal cells, 92. 
Posterior transverse vein, 92. 
Postical vein, 92. 
Przeoperculum, 93. 
Preeorbital, 93. 
Primitive groove, 109. 
Proboscidea, 119. 
Proboscis, 90. 
Prosimie, | 20. 
Prostate gland, 64. 
Protista, 23. 
Protoplasm, 2. 
Protopodite, 78. 
Protozoa, 2, 99. 
Pseud-heemal system, 45. 
Psittaci, 116. 
Pteropoda, 107. 
Pterosauria, 113, 
Ptiloptera, 117. 
Pulmonary sac, 67. 
Pulmonary vesicles, 11. 
Pulvilli. 86. 
Pupil, 98. 
Pygopodes, 117. 
Pyloric coeca, 95. 
Pythonomorpha, 112. 
Q 
Quadrumana, 120. 
r 
Rachis teeth 63, 69. 
Radial coca, 40. 
Radial vein, 91. 
Radula, 69. 
Raptores, 116, 
Ratitee, 115. 
Rectal papille, 89. 
Renal organs, 11; of Sea-squirt, 51 ; 
of Cockle, 54; of Periwinkle, 5? ; 
of Garden Slug, 62; of Sea Snail, 
67 ; of Stick Insect, 81; of Blue- 
bottle Fly, 89; of Sea Mullet, 96. 
