INDEX 
826 
PAGE 
Arterial system of embryo of 
higher Vertebrates 507 
Arthrobranchs of crayfish 291 
Arthropoda, classes of . 9 
, general characters of 280 
Articular : : - 554 
Artiodactyla . : 754 
33 and Perissodac- 
tyla contrasted 754 
Ascaridze . . . 208 
Ascaris . . . . » 202 
Ascetta : j ‘4 + 125 
Ascidia ‘ : . 444 
Ascidiacea 457 
Ascon type (of sponge) . 127 
Asexual reproduction . + 54 
Aspidocotylea . : 190 
Aspredo : ‘a ‘ 562 
Astacus . : 281 
Asteracanthion . : + 255 
Asterias fi . : + 255 
Asteroidea F + 254 
Astronyx . 2 z . 262 
Astropecten . . . 260 
Astrophyton . . » 262 
Astrorhizidee ; + IQ 
Atavisms or reversions . . 86 
Atax * - 373 
Ateles . a ‘ . 788 
Athecze . . . . 617 
Atlanta ‘ . a + 422i 
Atlantosaurus - . 645 
Atlas vertebra a : - 700 
Atrial cavity F 446, 465 
Atriopore of Amphioxus . 460 
Attidee . « 372 
Auchenia - 756 
Auditory capsules of skull » 478 
Auditory nerve. « 490 
53 organs of Insects + 344 
Aulostoma » 244 
Aurelia 7 . - 152 
s life history of . » 155 
+, relatives of - 157 
Auricularia (of Holothuria) . 278 
Australian region . . 805 
Autogamy . ‘ e - 56 
Autophage . . . . 679 
Autostylic . ‘ . - 584 
Autozooid é . . 168 
Aves (see Birds) . 
Axial skeleton ad Backbone) 478 
Axifera 
Axis vertebra ‘ 7 
Axolotl : . - 606, 
Aye-Aye : . 
Azygobranchs ,. . 
BABIRUSA . . . ‘ 
Baboons Z . ‘ é 
Backbone is 
Bactrites . 
Baculites ‘ ‘ 
Badger : ‘ 
Baleena “ ‘ 
Baleenoidea . 
Balzenoptera . 
Balanoglossus ‘i . “ 
59 Vertebrate char- 
acters 0: 
Balanus , ; 
Baleen . ‘ * 
Bandicoot . r . 
Barbary ape . : 
Barbule E ‘ 
Barnacle ze c f 
Basitemporal . : 
Batoidei c . 
Bats. ‘ . 
Bdellostoma . : ‘ : 
Bears . é * « 
Beaver ‘ . % 
Bee . , ‘ 
Beetles ‘ 2 5 
Belemnites . A “ 2 
Belinurus . , . , 
Belodon c . 
Beroe . ‘ é . 
Bilateral symmetry . : 
Bile P 3 
Bilharzia. . 
Bionomics. See Cicology. 
3 Crustacea . F 
a Fishes c es 
se Insects . z 
39 Mollusca . 423, 
PA Protozoa . 
33 Sponges . ‘ 
Bipalium * . * 
Bipinnaria . . 
169 
700 
607 
784 
420 
755 
788 
481 
432 
