INDEX 



959 



M 



Macaca mulatta (rhesus monkey), charac- 

 teristics of egg, site of fertihza- 

 tion, and place of sperm entrance 

 into egg, 207t 

 implantation of, 920, 922 

 MacBride, E. W., 55 

 McClain, J. A., 864, 879 

 McClung, C. E., sex chromosome hypothe- 

 sis of, 215 

 McClure, C. F. VV., 731 

 McCrady, E., Jr.. 364, 930 

 Macromastia, 590 

 Maculae of ear, 854 

 Malaclemys centrata, sperm survival within 



female genital tract of, 197 

 Male, amplectant, 248 

 Mall, F. P., 664, 721 

 Malleus, 674, 851 

 Malpighian body, 781, 782 

 Malpress, F. H., 108 

 Mammae, xix, 587 

 Mammalia, xix 



Mammalian embryo, olfactory organ de- 

 velopment of, 844 

 Mammals, changes in converging veins of 

 heart in, 748 

 chorionic vesicles in, 924 

 copulatory organ of, 19 

 development of heart in, 757 

 development of lungs in, 648, 649 

 development of sternum in, 687 

 development of vertebrae in, 685 

 developmental stages of neurocranium 



and splanchnocranium in, 675 

 divisions of primitive cloaca in, 715 

 effect of pituitary and thyroid glands on 



development of, 885 

 eutherian, cleavage in egg of, 297 

 facial and cervical muscles derived from 



hyoid arch mesoderm in, 779 

 formation of coelomic cavities in. 868 

 formation of sternum in. 688 

 gastrulation in. 431 

 heart of. converging veins of, 747 

 metatherian, cleavage in egg of, 297 

 modifications of circulatory system of at 



birth, 766 

 musculature associated with mandibular 



visceral arch of, 717 

 origin of definitive germ cells in. 118 

 origin of musculature of diaphragm of, 



718 

 other than pig, gastrulation in. 435 

 palatal conditions in, 615 

 parietal pericardial wall development in, 

 872 



Mammals — (Continued) 



prototherian, egg, bilateral symmetry of, 

 162 



tertiary egg membranes of. 904 



tubulation of epidermal area in, 476 

 Mammary cycle, 92 

 Mammary glands, 587 



changes in during reproductive cycle, in 

 bitch, 102 



development of, 588, 589 

 Mammary (milk) ridges, 587 

 Mammilla (teat; nipple), 589 

 Mammillae, depositions of in bird's egg- 

 shell, 906 

 Mammogen, 107 

 Mandibular somite, in shark, 716 

 Mandibularis, division of trigeminal nerve, 



829 

 Manta birostus, ray, xvi 

 Mantle (nucleated) layer, of developing 



neural tube, 817 

 Marcus, H., 716 

 Marginal cells, of chick blastoderm, 316 



of Echidna blastoderm, 326 {see also 

 Vitellocytes) 

 Marginal layer, of developing neural tube, 



817 

 Marmoset, Oedipomidas geofjroyi, lack of 



freemartin condition in. 892 

 Marrow, red, 694 



yellow, 694 

 Marrow areas, secondary, 668 

 Marrow cavities, 662 



primary, 667. 668 

 Marshall, F. H., 7 

 Marsupial frogs, 916 

 Maternal placenta (pi. materna), 922 

 Mathews, A. P., 219 

 Mating urge, and spermatogenesis, 22 

 Matrix, of nail, 584 

 Matthews, S. A., 23 

 Maturation of egg, in Echidna, 254 



in egg of pigeon. 267 



in hen's egg. 252 

 Maxillaris, division of trigeminal nerve, 828 

 Maximow, A. A., 582, 664 

 Mead, A. D., 217 



Meatus venosus, of chick embryo, 743 

 Mechanism, for controlling time of sperm 



entrance into egg, 257 

 Meckel's cartilage, 672 

 Median fissure, ventral, 820 

 Median septum, dorsal, 820 

 Mediastinum, 793, 871, 880 

 Medulla, of hair shaft, 582 



of ovary, 58, 795, 796, 797 

 Medullarin, 890 

 Medullary cords, 792 



