INDEX-GLOSSARY. 359 



Air-sac, 249, 252. 



Alimentary Canal. See Digestive Organs. 



Allantois (aXXas, a\\avr-, a sausage), in the Bird and Mammal An embry- 

 onic appendage which grows out from the posterior part of the intestine, 



309. 



Alps, 349. 



Alternation of Generations, 39 ; Hydra, 27 ; Distoma, 35, 39. 

 Alveolus (alveolus, a little hollow) A socket for a tooth, 284. 

 America North A., 349, 350, 353; South A., 349, 350, 352. 

 Amia, 349. 

 Amnion (apviov, used with the modern meaning), in the Bird and Mammal 



A sac-like appendage by which the embryo is surrounded, 265, 309. 

 Amniota (U/JLVIOV), 342. 

 Amoeba (a/xoi/36s, changing), 7, 11, 311. 

 Amoeboid Resembling an amoeba, especially as regards movement by slow 



protrusion of pseudopodia, 11, 60, 318. 



Amphibia (<V</jo>, both; 0ios, life), 343 ; 3, 4, Chap, x., 174. 

 Amphiccelous (<V<w, both ; /coTXos, hollow) of the centrum of a vertebra 



Biconcave, 158, 184. 



Amphioxus (M<i, on both sides; oi/s, sharp), 341, 134-152. 

 Ampulla (ampulla, a flask, a bottle), in the Vertebrate ear A dilatation 



at one end of each semicircular canal, 173, 219, 256. 

 Anabolism (ava/SaX*:, a heaping up, an ascent) Assimilation, q.v. 

 Analogy Physiological equivalence, 311. 

 Anamniota (av- y negative ; a/jiviov), 343. 

 Anapophysis, in a Vertebra A process situated below the postzyga- 



pophysis, 279. 

 Angle ; of jaw, 276. 



Annelida (annellus, a little ring) Segmented worms, 340 ; Chap, v., 65. 

 Annulus, 75. 



Animals Distinction from plants, 5. 

 Ankle. See Tarsus. 



Antebrachium (ante, before ; brachium) The fore-arm. See Arm. 

 Antenna (antenna, a yard-arm), in Crustacea One of the second pair of 



slender sensory appendages of the head, 89, 103. 

 Antennule (dim. of antenna, a yard-arm), in Crustacea One of the first 



pair of slender sensory appendages of the head, 89, 103. 

 Anti-trochanter (av-ri, against ; trochanter), in the Bird A facet above the 



acetabulum, against which the great trochanter plays, 239. 

 Anodonta (av-, negative; ooous, OOOVT-, a tooth) Fresh-water Mussel, 341; 



109-122. 

 Anthropidje, 346. 



