interest are his observations on Emberiza jankowskii, one of the rarest birds 
of eastern Asia, whose nests and eggs he was the first to discover, 
Yamashina, Yoshimaro (see also Taka-Tsukasa, Nobusuxe, Uchida, S., Kuroda, N., and 
18 
1940 
1941 
1941 
1941 
1941 
1941 

Yamashina, Y,) 
"Study on Sterility in Hybrid Birds I, Histological Researches on the Reproductive 
Organs of Hybrid Birds from the Family Ploceidae"” (with English resume): Jap Jour 
Gen, XVI (3), pp 97-105, 17 fig, 1 pl, Jun 1940, 
The reproductive organs of four hybrids, Padda oryzivora X Lonchura striata var. 
domestica, Lonchura atricapilla X L. striata var, domestica, Erythrura trichroa 
XE, psittacea, and Aidemosyne modesta X A, malabarica were studied, These 
hybrids were considered in life to be sterile, and on microscopic examination 
their incomplete gonads proved them so histologically. 

"Studies on the Sterility in Hybrid Birds 11, Histological Studies of the Repro- 
ductive Organs in Snecies Hybrids of the Family Columbidae" (with English resume): 
Jap Jour Gen, XVII (1), pp 1-12, 1 col pl, Feb 1941, 
The reproductive organs of the hybrids Streptovelia orientalis X S. decaocto, S. 
chinensis X S, decaocto, and Geopelia cuneata X G, Striata were subjected to 
histological study, The male hybrids derived from these crosses have large 
testes, but part of the germ cells degenerates following failure of normal 
synopsis of the chromosomes; thus they are not feeund, The females of the first 
two crosses have normal ovaries and oviducts and lay many eggs, but these rarely 
hatch, probably owing to failure of the maturation division. The female of the 
last cross has no gonad-like body, and only a rudimentary oviduct is observable, 
"Studies on the Sterility. in Hybrid Birds III, Cytological Investigations of the 
Intergeneric Hybrid of the Male Muscovy Duck, Cairine moschata, and the Female 
Domestic Duck, Anas platyrhyncha var, domestica" (with English resume): Jap Jour 
Gen, XVII (5), pp 207-227, 2 uncol pl, 1 col pl, Oct 1941, 
The chromosome numbers of the Muscovy duck and domestio duck and their hybrids 
were determined to.be 80 in the male and 79 in the female, The karyotypes of 
Muscovy and domestic ducks are similar except for remarkable differences in 
the largest V-shaped and the sixth largest rod-shaped chromosomes, The diploid 
chromosome complement of the hybrid consists of the sum of the haploid sete of 
the parental species, The proliferic divisions of both spermatogonial and 
oogonial cells of the hybrid proceed quite regularly, but the meiotic processes 
in the adult testis of the hybrid are abnormal, owing to a failure of pairing 
between chromosomes of the parental species, so the first meiotic division does 
not advance beyond the metaphase, 
"Cytological Investigation on Bird Hybrids": Jap Jour Gen, XVII (5), pp 245-246, 
3 fig, Oct 1941. 
The diploid chromosome complex of a hybrid consists of the haploid chromosome 
complex of its parents, 
"An Examination of the Food Habits of the Japanese Birds": Tori, XI (51,52), pp 
1-46, Oct 1941. 
The author and two assistants collected birds and their stomach contents on 
the Seven Islands of Izu between December 1933 and May 1934, Identification 
of the contents of 445 stomachs from 42 species is listed, and the following 
birds are recorded for the first time from the area: Anthus h, hodgesoni, 
Synthliborhamphus antiguus, Forzana fusca erythrotnoraxse 
"22 New Records of Birds from the Japanese Islands": Tori, XI (51,52), pp 46-52, 
Oct 1941.— 
