902 H. H. NEWMAN AND J. THOMAS PATTERSON 
normal, but further examination reveals our mistake, for each 
of these two individuals possesses ten well defined bands. The 
condition seen in one of the foetuses is so obviously a splitting 
that we are compelled to interpret the extra band in each of these 
foetuses as having been produced by a complete splitting of the 
first band. 
Foetus 1 shows an extensive bilaterally symmetrical and some- 
what complex regional splitting of the first band. . On both sides, 
beginning 6 scutes from the margin, there occurs a splitting involy- 
ing 9 scutes, and in the central part of the band there is another 
TTT 
COCA Pete 
17 
Fig. 5 Diagrams of the ‘abnormal’ bands of foetuses t and 11 from female no. 101. 
split region of 17 scutes. Separating the median from the two 
lateral splittings are paired unsplit regions, each involving 8 
scutes. In the ninth band there is another band peculiarity, 
consisting of a ‘jog’ in the middle of the band similar to that-sshown 
in fig. 23. There are 34 scutes to the left of the break and 31 
to the right. The region involving the fusion is illustrated dia- 
grammatically in fig. 5, 1. 
Foetus 11 shows a more advanced stage of the splitting in that 
the process has gone on to completion on the right side and has 
extended to within 6 scutes of the margin on the left side (fig. 5, 
11). Asin foetus 1, there occurs here also a ‘ jog’ in the ninth band, 
which is approximately the ‘mirror image’ of that in the partner 
individual, in that there are 34 scutes on the right of the break 
and 30 on the left. 
