INDEX 



587 



Lepidosiren (continued) — 



compound nature of pharyngeal con- 

 strictor muscle, 217 



egg, 26 



external form, 434 



external gills. 154 



gastrulation, 34, 35, 36 



heart, 375, 379 



lung, 162, 170, 171 



modelling of intestine, 184, 185 



motor nerve-trunks, 106, 108, 109, 110 



myotome, 201, 202, 203 



neural rudiment, 496 



olfactory nerve, 113 



optic rudiment, 136 



origin of mesoderm, 58 



otocyst, 131 



pancreas, 190 



Pinkus's organ, 133 



pronephros, 231, 232, 233 



respiratory limbs, 451 



rods, 137 



sclerotome, 285 



segmentation, 26 



skull and myotomes, 213 



teeth, 324, 331 



thymus, 177 



thyroid, 175 



venous system, 407, 409 

 Lepidosteus — 



bone and scales, 334 



cement-organs, 181 



external form, 431 



muscle-buds, 206 



ovary, 277 



segmentation, 24, 25 

 Limbs, 441 



evolutionary origin, 443 



skeleton, 349 



varying situation, 448 

 Liver, 186 

 Lung, 161 



Lung-fish (Lepidosiren, Protopterus, C'era- 

 todus) — 



cement-organs, 78, 79 



cloacal caecum, 242 



egg, 25 



eye muscles, 211 

 hypobranchial muscles, 212, 213 

 opisthonephros, 260 

 otocyst, 131 

 practical hints, 565 

 segmentation, 25, 26 

 vasa efferentia, 279 

 Lymphatic system, 426 



Macromere, 6 



Malpighian body, 227, 246, 260 



Mandibular arch, 319 



ridge, 145 

 Maxillary process, 127 



ridge, 145 

 Medullary folds, groove, plate, 83 



sheath, 85 



Meridional, 5 



Meroblastic, 7 



Merocyte, 14, 17, 18 



Mesencephalon, 87 



Mesenchyme, 66, 286, 506 



Mesenteric arteries, 407 



Mesenteron, 144 



Mesentery, 199 



Mesoderm, axial and peripheral, 63 



general remarks on, 54, 506 



lateral, 59 



origin of, 65 



segments, 59 

 of head, 208 

 Mesonephros, 221, 253, 254 

 Mesothelium, 67 

 Metanephros, 221, 256 

 Methods, embryological, 573 

 Micromere, 6 

 Micropyle, 457 

 Mouth, 498 



Miillerian duct (oviduct), 242 

 Muscle-buds, 205, 206, 207, 208 

 Muscles, 205 



of median fins, 205, 206 



of paired fins, 206, 207 

 Myoblast, 201, 202, 203, 204 

 Myocoele, 202 



Myoepithelial cells, 202, 204 

 Myosepta, 202 

 Myotomes, 198, 201, 203 

 Myxinoids — 



pericardiac cavity, 200 



segmentation, 18 



spawning locality, 559 



Nares, 125 



external, temporary obliteration of, 129 



internal, Amniota, 151 

 Nasal process, median, 127 

 Necturus — 



rib, 304 

 Neonychium, 74, 75 

 Neopallium, 91 

 Nephridia, 217 

 Nephrocoele, 198, 226 

 Nephrostome, 222 

 Nephrotome, 198 

 Nephrotomes, secondary, 247 

 Nerve development, general discussion, 113, 

 345 



optic, 140 



pineal, 97 

 Nerves as landmarks, 345 



cranial, 122 



sensory, 112 

 Nerve-trunks, motor, 102, 104, 106, 106, 



108, 109, 110, 111, 204 

 Nervous system, 82 



evolutionary origin, 118 

 Neural arches, 292, 294 



crest, 121 



spine, 296 



tube, 83 



