Index 
Recessus cavi tympani, 149 
Recessus scale tympani, 149 
Rectum, 155 
transsection of (fig.), 186 
Rectus muscles of eye, 146 
development of, 332 
Respiratory organs, 197, 200; (fig.) 
I 
9 
Rete Malpighii, 48 
Retina, 147 
development of, 321 
Retractor oculi muscle, 146 
Ribs, 77 
Rima auditoria, 148 
Ring muscle, 157 
Roof of mouth, 165 
covering of (fig.), 166 
glands of, 167 
papille of, 167 
Saccus naso-lachrymalis, 146 
Scales, development of, 333 
Sclera, 146 
Scutes, 47 
Semicircular canals, 149 
Semilunar valves of stomach, 154 
Sexual characteristics, 19 
Sexual maturity, 17 
Shell membrane, 228 
Shell-tooth, 334 
Sinus venosus, 202 
Size of alligator, 16 
at hatching, 16 
Skeleton, 46, 50 
Skin, 87 
Skull, 58 
dorsal aspect of, 59 
lateral aspect of, 67 
posterior aspect of, 70 
sagittal section of, 72 
ventral aspect of, 63 
Smaller part of stomach, 153 
Small intestine, 154 
histology of, 179, 186 
mucosa of (fig.), 184 
transsection of (figs.), 181, 182, 
183, 185 
Smithsonian Institution, 226, 227 
Somatapleure, 279 
Somites, 251, 252, 256, 266, 267, 
274, 282, 292, 300 
Special sense organs, 144 
357 
Spinal cord, 131, 290, 291, 298, 
31I, 325 
development of, 298 
Spinal ganglion, development of, 
299, 311, 312; 314, 331 
Spinal nerves, 138 
Splanchnopleure, 279 
Stenosauria, I 
Sternum, 77, 80 
Stomach, 152, 153 
development of, 305, 326 
glands of, 177, 179 
histology of, 174 
transsection of (fig.), 176 
Stomodeum, 317, 322 
Stratum corneum, 48 
Supratemporal fossa, 57 
Sympathetic nerves, 314, 325, 337 
Systemic arch, 203 
Tail, 317, 318, 329 
Tailfold, 274 
Tapetum lucidum, 146 
Tarsus, 88 
Taste papille, 165 
Tear dots, 145 
Teeth, 47, 64 
Teleosauria, I 
Temperature range in swamps, 
23 
Tendon Achilles, 126, 127 
Testes, 194. 
Thoracic ribs, 78 
Thyroid gland, development of, 
78, 269 
Tomistoma schlegeli, 2 
skeleton of, 51 
Tongue, 150 
covering of (fig.), 160, 161 
development of, 333 
epithelium of, 161 
glands of, 160, 162, 163, 164 
histology of, 157 
papille of, 160, 165 
Tooth, development of, 333 
socket of, 64 
structure of, 65 
Torsion of body, 274, 336 
Trachea, 197 
development of, 324, 330 
rings of, 198, 199 
Trigeminal foramen, 78 
