214 



INDEX AND GLOSSARY. 



Palpation, the exercise of the touch, 

 40. 



Palpi, jointed organs for touch, about 

 the mouth of insects, 40. 



Pancreas, 101. 



Papilla, a little pimple, 38. 



Paramecia, reproduction of, 126. 



Parasitic, living on other objects. 



Passerine, birds of the sparrow kind, 

 168. 



Peduncle or Pedicle, a slender stem. 



Pelvis, the cavity formed by the hip- 

 bones, 60. 



Pentacrinus, 199 ; metamorphosis 

 of, 148. 



Perception, 43. 



Perchers, a class of birds, xvi. 



Peristaltic motion, 76. 



Petrifactions, 183. 



Pigment, a coloring substance, 27. 



Pituitary membrane, 37. 



Placenta, the organ by which the 

 embryo of mammals is attached to 

 the mother, 121. 



Placoids, fishes with a rough skin, 

 like the shark or skate, xvi. 



Planaria, its digestive apparatus, 74 ; 

 an eye of, 29. 



Plant-lice. See Aphides. 



Plants compared with animals, 16. 



Platynotus, 193. 



Pleiocene formation, 187. 



Plesiosaurus, 197, 200. 



Pleurotomaria, 201. 



Ploceus Philippinus, nest of, 47. 



Plutonic rocks, 182. 



Podurella, mode of leaping, 68; em- 

 bryo of, 1 14 ; egg of, 104 ; repro- 

 duction of, 125. 



Polyps, a small animal fixed at one 

 end, with numerous flexible feel- 

 ers at the other, 3, 29. 



Prehension, act of grasping, 85. 



Primary age, 195. 



Primitive stripe, 113. 



Progression, 66. 



Proligerous, the part of the egg 

 where the embryo is placed, 111. 



Proteus, 177. 



Protosaurus, 196. 



Protractile, capable of being ex- 

 tended. 



Pterichthys, 194. 



Pterocoma pinnata, 199. 



Pterodactylus, 198. 



Pteropods, mollusks with wing-like 

 expansions for swimming, xviii. 



Pulmonary, relating to the lungs, 90. 



Pulmonates, mollusks which breathe 



air, xviii. 

 Pupil, 25. 

 Pyrula, egg-cases of, 106. 



Quadrumanous, four-handed, 168. 

 Quadruped, animals with four legs, 

 16. 



Radiata, animals whose organs ra- 

 diate from a centre, 3. 



Radius, one of the bones of the arm, 

 59. 



Relation, functions of, 21. 



Reproduction, peculiar modes, 125. 



Reptiles, number of, 3 ; reign of, 

 190, 195. 



Respiration, 92. 



Retractile, that may be drawn back, 

 60. 



Rhizodonts, xvi ; of the trias, 196. 



Rhizopods, xix. 



Rocks, classification of, 183. 



Rodents, quadrupeds with teeth for 

 gnawing, 83. 



Rotifers, jaws of, 79. 



Ruminants, quadrupeds which chew 

 the cud. 



Running 1 , 67. 



Rytina Stelleri, 178. 



Salenia, 201. 



Saliferous formation, 186. 



Saliva, 83. 



Salivary glands, 100. 



Salpa, reproduction of, 128. 



Scansores, birds adapted for climb- 



inj?, xvi. 

 Scaphites, 200. 

 Scapula, 59. 

 Sclerotic, the principal coat of the 



eye, 25. 



Scutella, jaws of, 77. 

 Sea-anemone. See Actinia. 

 Sea-urcliin, eye of, 29 ; digestive 



organs, 74. 



Secondary age, 190, 195. 

 Secretions, 98. 

 Sedimentary rocks, 183. 

 Segment, portion of a circle or 



sphere. 



Sensation, general, 19, 23. 

 Senses, special, 23. 

 Serous, watery, 112. 

 Shark, egg of,' 104. 

 Shoulder-blade, 58. 

 Sight, 24. 

 Silex, ilinty rock. 



