INDEX 



Abdominal ribs, i6 



Acanthias, chondrocranium, 60, 82 



pectoral girdle, 53 



skull, 83 



vertebrae, 31 



visceral arches, 67 

 Acanthostoma, cranium, 77 

 Acetabular bone, 231, 262 



region, 228 

 Acetabulum, 228 

 Acipenser, branchial arches, 96 



pectoral girdle, 230 



skull, 99, 100 



vertebrae, 28 

 Acrocoracoid process, 256 

 Acromion, 257 

 Acropodium, 276 

 Actinotrichia, 220 

 Adlacrimal, 139 

 Adnasal bone, loi 

 Aegitognathous, 179 

 Ala magna, 189 



parva, 189 



temporalis, 109, 183 

 Alisphenoid, 70 



cartilage, 60 

 Alligator, pelvis, 267 



skull, 141, 166 



tarsus, 281 

 Allostoses, 7 

 Amblystoma, cranium, 126 



developing vertebrae, 38 



visceral arches, 125 

 Amia, caudal fin, 222 

 Amiurus, chondrocranium, 91 



cranium, interior, in 



skull, 94, 95 

 Ammocoetes, chondrocranium, 79 

 Amniota, skull, 134 



vertebrae, 41 

 Amphibia, free appendages, 279 



pectoral girdle, 246 



pelvic girdle, 262 



Amphibia, ribs, 39, 41 



scales, 13 



skull, 119 



sternum, 52 



vertebra, 36 

 Amphicoelous vertebrae, 22 

 Amphistyly, 87, 95 

 Amphiuma, chondrocranium, 124 

 Amphyplatyan vertebrae, 22 

 Anal fin, 221 

 Anapophysis, 49 

 Anarrhchthys, skull, 113 

 Ancylopoda, skull, 215 

 Angulare, 78, 202 

 Annulus, 277 

 Antebrachium, 275 

 Antorbital process, 62, 83 



vacuity, 75 

 Anura, free appendages, 280 



skull, 130 



vertebrae, 40 

 Appendages, azygos, 221 



free, 231, 275 



median, 221 



origin of, 241 



paired, 227 



pectoral, 227 



pelvic, 227 



Tetrapoda, 244, 245 



ventral, 227 

 Appendicular skeleton, 220 

 Arcades, 75, 137 

 Arch, branchial, 65 



gill, 65 



hyoid, 65 



mandibular, 65 

 Arches, visceral, 58, 65 

 Archipterygial theory, 241 

 Archipterygium, 241 

 Arthrodira, skull, 118 

 Articular process, 18 

 Articulare, 71 

 Artiodactyla, free appendages, 299 



325 



