tissue capsules of the cysts varied from 15-21 mm. long by 8-10 mm. 
broad (fig. i). Recently I proceeded to examine a scolex extracted 
from its bladder with a view to making certain of the diagnosis. I was 
surprised accordingly, on examining a specimen, to find only sixteen 
booklets instead of twenty-two to thirty-two, which is the number 
given by various authorities as comprising the limits of variation. It 
was possible that one circle of booklets was absent, but on measuring, 
this explanation, taken also in connection with what will appear later, 
is hardly possible. 
Fio. 2. Circle of booklets of the same, x 8o approximately. 
1. Pectoral cysticercus (fig. 2). Sixteen booklets. The size of the 
hooks varied from io8-o(?>-i44-o/i. As will be seen from the 
appended protocols, there was no sharp demarcation between small 
and large hooks, but liooklets of various sizes also occurred, t-g’ 
r26'6/i, I2Q-6//, 133-2/*, 136-8/*. 
2. Pectoral cysticercus. Twenty-one booklets found. The range 
of variation was in this case greater, viz., from 104*4-122-4/* for what 
might be called small hooks, and from 154-8-165-6/* for the large. 
