INDEX 



329 



Meiotic divisions {see Maturation) 

 Melanin, 64 



Membrane, fertilization {see also Mem- 

 brane, vitelline), 73, 77 



nictitating, 175 



nuclear. 65 



pericardial, 153 



tympanic {syn. tympanum), 31, 178, 



185, 195, 257, 259 



vitelline {see also Membrane, fertiliza- 

 tion), 45,5/, 55, 69, 73,81,83, 

 93 

 Membrane bones, 214 

 Mento-Meckelian cartilage bone, 216 

 Mesencephalon {syn. midbrain), 139, 140, 

 141, 158, 162, 163, 164, 166, 

 168, 190 

 Mesenchyme {syn. embryonic mesoderm) 

 {see also Mesoderm), 143, 144, 

 144, 145, 147, 158, 172, 177, 

 180, 184, 247,251,252 

 heart, 135, 143, 144, 168 

 Mesentery, dorsal, 228, 232, 245, lAl 

 Mesocardium, dorsal, 757, 233, 235 



ventral. 233, 245 

 Mesocoel {syn. aqueduct of Sylvius), 7i5, 

 144, 158. 162, 163, 167, 765, 190 

 Mesoderm {see also Mesenchyme), 3, 14, 

 20, 21, 97, 98, 77^, 725, 128, 

 141, 209, 247 

 embryonic {see Mesenchyme) 

 gastral, 777 



lateral plate {syn. hypomere, ventral 

 plate), 137, 145, 146, 147, 150, 



186, 219, 231. 247, 251 

 peristomial, 77^, 775 

 somatic, 7i5, 750, 231 

 somite, 757, 144, 145, 147, 148 

 splanchnic, 135, 137, 144, 145, 147, 148, 



750,231 

 Mesomere {syn. intermediate cell mass), 



146, 147, 148, 149, 186, 218, 



279, 247 

 Mesonephric duct {see under Duct) 

 Mesonephric vesicle, 221, 222 

 Mesonephros {syn. Wolffian body), 221, 



227, 245, lAl, 253, 259, 260 

 Mesorchium, 31. 40, 42, 222, 228 

 Mesovarium, 43, 48, 228 

 Metamorphosis, 19, 22, 24, 25, 26, 30, 33, 



157,254-258 



Metamorphosis of spermatid {see under 



Spermatid) 

 Metaphase, 69 

 Micromeres, 91 



Midbrain {see Mesencephalon) 

 Midgut, 777, 729, 133, 137, 142, 143, 



148, 152, 205 

 Mitosis (^yn. cell multiplication) {see also 

 Cleavage, Cell division), 3, 14, 

 33 

 Monro, foramen of, 162 

 Morgan, T. H., 8 

 Morphogenesis, 14, 15 

 Morphology, descriptive, 4 

 Mouth, 27, 22, 23, 25, 26, 28, 157, 755, 



765, 184, 208, 252, 257, 260 

 Movement(s), morphogenetic, 700, 104 



spawning, 40 

 Mucous glands, 259 



MuUerian duct {syn. vestigial oviduct, 

 rudimentary male oviduct), 75, 

 41,^2,226 

 Multiplication stage in maturation {see 



under Stage) 

 Muscular response, 27, 26, 25, 30 

 Muscle, 98, 749, 155, 192,244,251,259 

 external rectus, 184 

 inferior obliquus, 183 

 rectus inferior, 183 

 medialis, 183 

 superior, 183 

 retractor bulbi, 184 

 superior oblique, 183 

 Myocardium. 745, 750, 75i, 233, 237, 252 

 Myocoel, 745, 209, 279, 231 

 Myotome {syn. muscle segment), 705, 

 132, 747, 149, 752. 756, 755, 

 209, 211, 279, 247, 251 



N 



Nares. external, 779, 750, 752, 192 

 internal {syn. choana), 779, 750, 192 



Nasal bone, 275, 216 



Nasal gland, 750 



Needham, J., 8 



Nephrocoel, 750, 219, 231 



Nephrostome {see also Funnels, peri- 

 toneal), 219, 279, 223 



Nephrotome {syn. nephrotomal mass, in- 

 termediate cell mass), 149, 218, 

 221 



