248 



INDEX AND GLOSSARY. 



Test, the bristle crust covering the 

 crustaceans, &c., !). 



Teuthideans, the iamily of cuttle- 

 fishes, 22. 



Tibia, one of the bones of the leg, 87. 



Tissues, 37 ; areolar, 38 ; cartilagi- 

 nous, 38 ; muscular, 39 ; osseous, 

 39 ; nervous, 39. 



Tongue, 62. 



Touch, 63. 



Trachea, the windpipe, 119. 



Tracheae, the air-tubes of insects, 

 118, 123. 



Transudation, 127- 



Trias formation, 218, 228. 



Trigonia, 230. 



Trilobites, 21, 32. 



Trocholites ammonius, 225. 



Trophi, organs for feeding, of in- 

 sects, crabs, &c. 



Tropical faunas, 204. 



Trot, 91. 



Tubulibranchiates, 21. 



Tunicata, mollusks with a leathery 

 covering, 159. 



Turrilites, 232. 



Tympanum, a drum ; the membrane 

 separating the internal and exter- 

 nal ear, 57. 



Type, an ideal image, 18. 



Ulna, one of the bones of the arm, 



83. 



Ultimate, final. 

 Univalve, having a single shell, like 



the snail, 27- 



Vascular, composed of vessels, 129. 

 Vegetative life, 44, 96 ; layer, 142. 

 Veins, 113. 



Ventricle, a cavity of the heart, 115. 



Vermicular, 100. 



Vertebra, a joint of the back-bone, 



46, 77. 

 Vertebrate, having a back-bone, 19, 



27. 



Vertical, in a perpendicular direc- 

 tion, 48. 

 Vesicle, a small membranous bag, 



37. 

 Vestibule, a porch ; the entrance to 



one of the cavities of the ear, 58. 

 Vibratile, moving to and fro, 112. 

 Viscera, 159. 



Vitelline membrane, 138. 

 Vitellus, 137. 

 Vitreous humor, 50. 

 Viviparous, producing living young, 



131. 



Vocal cords, 65. 

 Voice, 64. 

 Voluntary, under control of the will, 



43. 

 Vorticella, reproduction of, 157, 158. 



Walking, 90. 



Wapiti, 211. 



Warm-blooded animals, 122. 



Water-tubes of aquatic animals, 123. 



Whale, fans of, 104. 



Whales, mode of swimming, 94. 



White-fish, development of, 145. 



Windpipe, 119. 



Worms, 21 ; eye of, 53. 



Zoology, its sphere, 25. 

 Zoophytes, animals of a very low 



type, mostly fixed to the ground. 



of a plant-like form. 



