and "A New List of the Chromosome Numbers in Vertebrata" by K. Oguna and S. MakLno 

 (1937) t "ith slight modifications. The author nas accumulated data as completely 

 as possible from the original papers published up to the end of 19U8. This second 

 edition of "An Atlas of the Chromosome Numbers in Animals" nnt only comprises the 

 publications on chromosomes issued from the time of the pioneer researches until 191+8, 

 but also includes the available data of 19U9. Even though the accounts conflict, 

 all the authorities have been given for each species. As in the list previously 

 issued, all the species are classified so far as possible under phyla, classes, orders, 

 families, and genera. The arrangement of various phyla, classes, and orders follows 

 current usage. For convenience of reference, the families, genera, and species 

 are mostly put in alphabetical order. The accounts concerning the Protozoa are 

 excluded. 



The columns in the table are arranged in order of species name, chromosome number 

 in the division of 2n (diploid) and n (haploid), remarks, observer and reference in 

 the following order: 

 Species : Chrom. -number : Remarks : Observer : Reference 



2n" 



$h s 



Ovis aries 



27 S (1,11) 



X-Yd* 



M*kino »U3> «U* : Cyt.l3;Z.M.(jap.)$6 



This example snows that the chromosome number of the sheep, Ovis aries , is $U 

 in the spermatogonial division and 27 in the first and second spermatocyte divisions, 

 having the X-Y complex of the sex chromosomes in the male, and that the reference 

 to this work may be found in an article by Makino, 19u3, published in Cytologia, 

 Volume 13 and in another article by the same author, 19Ui, published in the Zoological 

 Magazine (japan), Volume £6. The soall letter of the alphabet indicates the order of 

 appearance of the papers, where more than two papers were published by the same authors 

 on one and the sane subject in the same year. 



Most of the important abbreviations used in the table and in the column of 

 reference will be found in the accompanying tables. 



( x ) 



