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R, norvegicus, R, rattus, and R, losea, all lowland dwellers, are ciosely re- 
lated taxonomically and ecologically, All possess 42 diploid chromosomes. R, 
fulvesceus coxinga and R, confucianus culturatus, closely allied mountain forms, 
show 46 diploid chromosomes, While distinctive morphological differences were 
found between the chromosomes of three lowland forms, only a slight difference 
in length of the largest chromosomes could be found between the two highland 
species, The sex chromosomes of all five species are of the XY type without 
exception, and both X and Y factors possess distinctive morphological character- 
istics in each species. The Y chromosome shows a gradual reduction by species 
during its develop.ent, 
"Karyotype of Cattle, Bos taurus, and Buffalo, Bubalus buffelus": Bot Zool, XI 
(10), pp 797-799, 11 fig, Oct 1943, 
Contrary to Pchakadze's report (1939), the chromosome number of Bubalus buffelus 
is 2n=48, n=24, 
"The Karyological Relation Between the Goat, Capra hircus, and Sheep, Ovis aries": 
Bot Zool, XI (11), pp 904-906, 16 fig, Nov 1943, 
The goat and sheep are believed, because of their karyological similarity, to 
have been derived from a common ancestor, 
"The Chromosomes of the Horse (Equus caballus) (Chromosome Studies in Domestic 
Mammals I)" (in English): Cytologia, XIII (1), pp 26-38, 30 Nov 1943, 
Chromosomes of two distinct breeds of horses were investigated, the Percheron 
and the Ryukyu pony, In number and general morphological characters, no sig- 
nificant differences were found between the two, The spermatogonium contains 
66 chromosomes, 33 in the haploid stage, 
"The Chromosome Complexes in Goat (Capra hircus) and Sheep (Ovis aries) and Their 
Relationship (Chromosome Studies in Domestic Mammals II)" (in English): Cytologia, 
XIII (1), pp 39-54, 30 Nov 1943, 
Chromosomes of the male germ cells in two breeds of goats and three breeds of 
sheep were studied, and no visible appreciable difference in number or other ex- 
ternal morphological featuree of the chromosomes was found, The number of 
chromosomes in the goat was determined to be 60 in diploid and 30 in haploid, 
in the sheep 54 in diploid and 27 in haploid, Evidence indicates a close kary- 
ological relationship between the sheep and goat, suggesting that both originated 
from a common ancestor, 
"Karyotype of Nesokia nemorivaga and Micromys minutus takasagoensis": Zool Mag, 
LV (11,12), p 373, Dee 1943. 
The author reports peculiar and complex karyotypes of the above species from 
Formosa, 
"A Contribution to the Study of the Chromosomes of Domestic Mammals": Zool Mag, 
LVI (1,2,3), pp 8-15, Mar 1944, 
A preliminary report of a karyological study of Japanese domestic mammals, in- 
cluding the horse, ass, pig, sheep, goat, cattle, south China cattle, buffalo, 
reindeer, fox, ani rabbit, "Detailed accounts on the chromosomes of these 
forms will appear serially later in Cytologia ," 
"Studies on the Murine Chromosomes IV, The Karyotypes of the Mole-Rat and the 
Harvest Mouse" (in English): Cytologia, XIII (2), pp 237-245, 10 Apr 1944, 
In the Formosan mole rat, Nesokia nemorivaga taiwanus, the number of chromo- 
somes is 46 in diploid and 23 in haploid, In the harvest mouse, Micromye minutus 
takasagoensis, it is 68 in diploid and 34 in haploid, The chromosome composition 
él 
