1608 



SUBJECT INDEX 



Vulpes fidfa, ovulation, temporal relation to ovu- 



"ation, 514 

 Vulvar connective tissue, estrogen and, 128 

 Vulvectomy, and erotic cognition, 139(i 



Wallabia rufogrisea 

 hypophyseal cytologv, acidophil types, 177- 



"178, 180 

 hypophysis 



prolactin distribution, 176 

 somatotrophin distribution, 176 

 Water buffalo, potencv of males, dominance-state 



and, 1247 

 Water distribution, in male accessory sex glands, 



androgen and, 395 

 Weasel (see also Mustela frenata, Mustela nivalis) 

 delayed implantation, 851 

 seasonal breeder, 315-316 

 Weaver finch (see Euplectes, Ploceidae, Quelea, 



Steganura) 

 Whale 



hypophysis, anatomy, 165, 167 

 intermedin, cellular origin, 200 

 ovum, size, 812 

 prostate, 369 

 Whale, blue, hypophysis, anatomy, 165 

 Whale, sperm, pregnancy, length, 961 

 Wolf 



father-young relationships, 1352 

 identification of genetic sex, 55 

 litter size, 961 

 pregnancy, length, 961 

 Wolffian duct 



Acris, androgen and, 1046 

 alligator 



androgen and, 1047, 10(59 

 estrone and, 1069 

 amniotes, 111-112 

 amphibians, HI 

 Anolis, testosterone and, 1068 

 Lacerta, androgen and, 1047 

 differentiation, 

 androgen and, 120 

 castration and, 120-121 

 estrogen and, 120 



lack of sensitivity to estrogens, 121 



paradoxical action of estrogens, 120 



Scyiierhinus, testosterone and, 1070 



salamander, orchiectomy and, 1045 



Sceloporus, female, androgen and, 1047 



Xanthine oxidase, in seminal vesicles, 392 

 Xanthocephalus xanthocephalus 



incubation, temporal relation to egg-laying, 1285 



ovulation, nesting conditions and, 1280 

 Xantusia 



corpus luteum, 1059 



oviduct, 1052 



pregnancy, length, 1059 



testis, interstitial cells, 1039 

 Xantusia vigilis, ovarian follicular growth, 1050 

 Xenodon, corpus luteum, 1059 

 Xenodon merremi, sperm storage in female, 1055 

 Xenopus 



blood calcium, orchiectomy and, 1052 



chromosome pattern, 44-45 



cloacal labia, steroids and, 1054 



gonad transformation, gonadal hormones and, 95 



hypo]>hyseal cytology, basophils, 188 



nui)tial pads, androgen and, 1046 



oviducal hyperemia, steroids and, 1054 



ovulation, steroids and, 1040 



Xenopus laevis 



blood calcium, ovariectomy and, 1052 



gonadal transformation in males, estrogen and, 



93 

 in pregnancy tests, 253, 986-987 

 responsiveness to gonadotrophins, in cross- 

 species tests, 253 

 sex dimorphism, nuptial asperities, 1042 

 Xiphias gladius, ovary, estrogen content, 1050 

 Xiphidium fasridl inn . accessory chromosome, and 



sex (lillciciitiation, 6 

 Xiphi>pht)rNs 



genital tract, development, 1060 

 hernui])hroditism, 1063 

 intraovarian fertilization, 1054 

 intromittent organ, 1042 

 sex dimorphism, sword, 1042 

 sex reversal, 1064 



androgens and, 1065, 1067 

 estrogens and, 1067 

 sperm storage in female, 1055 

 Xiphophorus helleri 



aggressive behavior, androgen and, 1254 



feminiTU' behavior by male, 1179 



masculine l)(>havior by female, androgen and, 



1197 

 parthenogenetic development, 1070 

 source of androgen, 1037 

 Xiphonis iPlatypoecilus) maculatus, mating be- 

 havior, hybrids with X. helleri, 1215 



Yak, Russian, breeding season, illumination and, 



501-502 

 Yolk deposition, fowl, 1116-1117 

 Yolk formation, (lolgi complex and, 809, 812 

 Yolk sac 



man, histocluMnical, 917 

 placenta, 909, 917 922 



alkaline i)li()sphatase in, 928, 934-935, 938 



antibody transport, 886, 918, 946 



changes with age, 947 



cytologv of visceral endodermal cells, 920, 



940-941, 944-945, 948-949 

 histology, 917-918 

 intercellular spaces, 947 

 rat, lipids in, 923, 938-939 

 pinocytosis, 920 

 Reichert's membrane, 917-918 

 role in al)sorption, 918, 920 



Zalophiis (tilifdinianus, parturitive behavior, 1311 

 Zaiophus irnl'lrharki 



father younfi relations, 1352 



parental behavior 

 male, 1314 

 sj)ecificity, 1320 

 Zainenis, pseudohermaphroditism, 1066 

 Zebu, pregnancy, length, 961 

 Zenaidura niacruura 



breeding season, 1353 



incubation behavior, 1353 

 Zoarcidae 



intraovarian embryogenesis, 1057 



viviparity, 1057 

 Zona pellucida (see Ovum) 

 Zonotrichia, breeding cvcles, factors regulating, 



1145 

 ZonoirirJiiu (ilhindlis 



fat deposit i. ,11 cycles, 1139 



seasoii.il rcproihictive activity, light and, 1140 



speruKil (i^ciicsis, testosterone and, 1101 

 Zonotrirhui l< urnphrys 



inculiatioii, temporal relation to egg-laying, 

 1284 



