Oct. io, 1913 
Cysiicercus Ovis 
33 
10mm 
Surface of caudal bladder of Cysiicercus ovis showing papillae. 
Enlarged, (Original.) 
contrast to the transverse rugae on the caudal bladder of C. ienuicollis 
(%. 12). 
As the nvmber of hooks of Cysiicercus ienuicollis has been found by 
various observers to 
vary from 26 to 44, an 
accurate distinction be¬ 
tween this form and C. 
ovis which would be 
applicable in all cases 
can not be drawn on 
the basis of the number 
of hooks, though, as a 
rule, the number of 
hooks found in C. ovis 
is less than the num¬ 
ber commonly present 
in C. ienuicollis . There 
is also an overlapping 
in the size of the hooks, 
the recorded limits for the large hooks being 170 to 220 ja in C. ienuicollis 
(larva and adult) and 156 to 1 88ju in C. ovis (larva and adult), and for 
the small hooks no to i6o/r in C. ienuicollis (larva and adult) and 96 to 
128/* in C. ovis (larva and 
adult). 
The hooks of Cysiicercus 
ienuicollis , however, average 
considerably larger than 
those of C. ovis , both in total 
length and in length of blade 
(fig. 6). In 25 large hooks 
from four adult and two 
larval individuals of Taenia 
hydatigena (C. ienuicollis) 
ranging in length from 180 
to 212 fit averaging 197/9 the 
blade varied from 72 to 108/t 
in length and averaged 93/*; 
and 20 small hooks from the 
Hmm. 
same specimens ranging in 
length from 116 to 136//, 
average 12 9/9 had blades 
Fig. is. —Surface of caudal bladder of Cysiicercus ienuicollis ranging in length from 60 
showing transverse furrows. Enlarged. (Original.) £q 76^ average 68/1. The 
average length of 37 large hooks of T. ovis (adult and larva) having a 
range of 156 to 1 88g was 173/9 with the blade ranging from 68 to 84/1, 
