YOSHIMARO TAX AK A 237 
being darker. The unilateral development of the pattern was very evident, 
and there was no intermingling of the characteristics of the two sides. 
Mosaic 5 (Fig. 72). In the summer culture of the same year, one more 
mosaic monster was obtained. On the left side of this individual the pattern 
was striped-black in segments II, III, IV, V, X and XI ; in the rest, the black 
was, roughly speaking, equal tot he normal in area. On the right side of the 
body, in segments III, VII and VIII black areas were likewise equal to the 
white (normal). In the other segments of the same side, the white area 
evidently predominated over the black. 
Of these five mosaic silkworms all but the third one died of disease, and 
their sex could not be ascertained. 
In 191 5, several more specimens were obtained; they are described 
below. 
.Mosaic 6. This example is interesting on account of its being a mosaic 
of size .is well as of colour. On the dorsum, the left half of the head and 
body anterior to segment VIII differs markedly from the right in being dwarf- 
ed, the "eye-spots" and anterior "semilunules" of the respective sides were 
naturally proportionate to that size difference. The five hinder segments ap- 
peared to be normal and bilaterally symmetrical. On the ventral side, the 
mosaic character extended further backwards ; the left half of all the segments 
including the thoracic as well as abdominal legs (the so-called anal leg 
included) were much smaller as compared with their counterparts of the 
opposite side. All the head appendages exhibited a similar asymmetry. The 
five anterior stigmata of the right side were remarkably bigger than the corre- 
sponding ones of the opposite side, which were equal in diameter to the 
remaining ones of the right. 
The coloration also partook of the asymmetry. On the dorsal side, the 
section anterior to segment VIII was opaque white on the right side, while on 
the left and the rest of the right side the body was oily. On the ventral 
side, the opaque right half, and the transparent left were sharply marked off 
from each other by the ventral median line throughout the entire length of 
