1556 



SUBJECT INDEX 



Leimadophis viridis, sperm storage in female. 1055 



Lemur, placental type, 908 



Lemur macaco, pregnancy, length, 960 



Lepadogaster , ovary, structural relations, 1049 



Lepidoptera, digametic females, 7 



Leptodeira albofusca, sperm storage in female, 



1055 

 Leptodeira annulata, sperm storage in female, 1055 

 Lepus americanus 



litter size, 960 



pregnancy, length, 960 

 Lepus cuniculus 



ovarian follicular growth, during pregnancy, 

 458 



superfetation, 458 

 Lepus europaeus 



nest-building pattern, 1305 



nursing-suckling relationship, 1321 

 Lepus timidus 



ovarian follicular growth, during pregnancy, 

 458 



superfetation, 458 

 Leydig cells (see also Interstitial cells] 



age at appearance of, 313-314 



and hypophyseal gonadotrophins, 336, 337 



androgens and, 338 



arrangement in interstitium, 318 



autonomic nerves and, 321 



estrogen and, 343-344 



histochemical reactions, 314 



hypophysectomy and, 335 



in adult testis, 309 



in cryptorchism, 314 



in fetal testis, 308 



in hypogonadism in human male, 348 



in intermediate breeding types, 316-317 



in ovary of bird, 1115 



in prepubertal testes, 308-309 



life history, 329-331 



man, fluctuations with age, 329 330, 332 



relation to mesenchymal cells, 309 



source of androgen, 330, 332 

 in fish, 1037-1038 



structure, 329-330 



urinary gonadotrophins and, 336 337 

 LH (Luteinizing hormone) 

 Libido, 1383 



in human male, diabetes mellitus and, 347 



theory, 1428 

 Libyan bird, fertilization, sperm penetration of 



zona pellucida, 832 

 Lid-closure reflex, frog, thyroxine and develop- 

 ment of, 1348 

 Linea masculina, frogs, 1043 



orchiectomy and, 1045 

 Lion 



hair-plucking at parturition, 1306 



litter size, 960 



masculine behavior by female, 1190 



pregnancy, length, 960, 1306 

 Lipase, histochemical differentiation, 891 

 Lipemia, birds 



estrogen and, 1106, 1117 



thyroid hormone and, 1117 

 Lipid droplets 



in adrenal cortex, 902 



in steroid-producing organs, histochemical dif- 

 ferentiation, 889 

 Lipids 



histochemical characterization, 889-890 



in male accessory reproductive glands, 387 

 Lithospermin 



and reproduction, estrogen-progesterone com- 

 pensation, 692-693 



Lithospermin (cont.) 



and termination of pregnancy, 692-693 



antigonadotrophic action, 692-693 

 Litter size, 960-961 



and development of behavior in rats, 1358 



and length of pregnancy, 959 



rat, age of animal and, 959, 961 



thyroid and, 669, 998-999 

 Littles' disease, chromosome idiogram, 65 

 Liver 



and estrogen inactivation, 673-674, 1126 



and estrogen synthesis, 647 



and steroid catabolism, 648, 650 



and testosterone inactivation in birds, 1107- 

 1108 



damage 

 ethienine and, 674 

 nutritional deficiencies and, 674 



disease, and testis, 348 



fatty infiltration, estrogens and, 674 



Oryzias, testosterone and, 1046 



RNA, pregnancy and, 690 



sex dimorphism in Gasterosteus, 1046, 1053 

 Lizards 



cloaca, sexual specialization, 1043 



epididymis, seasonal changes, 1040-1041 



oviduct 



specialization for ovoviviparity, 1052 

 ciliary action, 823 



oviparous species, 1059 



sex dimorphism, femoral glands, 1043 



sex reversal, estrogen and, 1068 



spermatogenesis, seasonal occurrence, 1037 



testis 



interstitial cells, 1039 

 rete structure, 1040 



urogenital fossa, 1052 



viviparous species, 1059 

 Llama 



breeding season, 502 



parturitive behavior, 1311 

 Lobipes lobatus, incubation 



by male, 1286 



temporal relation to egg-laying, 1285 

 Loligo pealii (see Squid) 



Lonchoptera dubia, thelytokous reproduction, 23 

 Lonchura cucuUata, nest-building, role of sexes, 



1270 

 Lophius piscaiorius, ovary, estrogen content, 1050 

 Lophobranchis , ovary, structural relations, 1049 

 Lophorlyx californica vallicola 



aggressive behavior, androgen and, 1255 



male sex behavior, testosterone and, 1353 



masculine behavior by female, androgen and, 

 1197 



submissive behavior, estrogen and, 1256 



territoriality, breeding cycle and, 1252 

 Lowes' syndrome, chromosome idiogram, 65 

 LTH (Luteotrophin) 

 Luteinizing hormone (see under Hypophyseal 



gonadotrophins) 

 Luteolysis (see also Corpus luteum, Regression), 

 536-537, 539 



deciduomas and, 537, 539 



hypophyseal gonadotrophins and, 537 



hysterectomy and, 537-539 



lactation and, 537 



oxytocin and, 537 

 Luteolytic mechanisms, 526 



Luteotrophin (see also under Hypophyseal gon- 

 adotrophins. Prolactin) 



placental origin in mouse, 1006 



