Oct. io, 1913 
Cysticercus Ovis 
37 
their shriveled condition the size of the cysticerci could not be accurately 
determined; apparently, however, they are somewhat smaller than C. 
cellulosae , rather slender and considerably elongated. The cysticercus 
of T. krabbei is readily distinguished from C. ovis by its elongated form, 
by the fact that the orifice of invagination of the head and neck is com¬ 
monly at one end of the cysticercus instead of at the side, and by the 
larger size of the body formed by the invaginated head and neck both 
* actual and relatively to the size of the caudal bladder. On account of 
certain evident similarities, such as the prominent genital papillae, and 
on account of the lack of an accurate detailed description of T. krabbei , 
no clear distinctions can be drawn between T. krabbei and T. ovis, though, 
no doubt, distinct differences could be found upon comparing specimens 
of the two species. 
Since the foregoing paragraph was written some of Moniez’s cotypes 
have been received from Prof. R. Blanchard, one specimen of the adult 
(B. A. I. No. 17351) and two specimens of the cysticercus (B. A. I. No. 
17352). The cysticerci, considerably shrunken, measure about 2 by 3 
mm. The surface of the caudal bladder is mammillated (as is also the 
case in the Alaskan cysticercus), and the cysticercus in this character 
thus resembles Cysticercus ovis. The number of hooks was not deter¬ 
mined, as most of them in the one specimen dissected were lost in 
mounting. Two of the large hooks measured 148// in length and had 
blades 70 ji long. A small hook measured 105/1 in length and had a blade 
60 f± long (fig. 6 , v, v f ). It has thus been determined that the sizes 
heretofore assigned to the hooks of Taenia krabbei , based on Moniez’s 
drawings, are erroneous and the apparent discrepancy between T. krabbei 
and the Alaskan cysticercus, noted in the preceding paragraph, has been 
removed. The ventral root of the small hooks is transversely enlarged, 
but is not distinctly bifid. A tendency toward the bifid condition, how¬ 
ever, has been observed in some instances in the Alaskan specimens. 
The data thus far available do not indicate a specific difference between 
Moniez's species and the Alaskan form, and the weight of evidence is 
still in favor of the correctness of the presumption that the Alaskan 
cysticercus and T. krabbei are identical. The adult specimen (B. A. I. 
No. 17351) corresponds closely to the drawing given by Moniez (1880a). 
The segments are remarkable for their great breadth, as compared with 
their length, and the large genital papillae, about a millimeter in diameter, 
are quite conspicuous. As the strobila may be abnormally contracted 
in length, too much weight should not, perhaps, be placed upon the 
extreme shortness of the segments relative to their width as a feature 
by which T. krabbei may be distinguished from T. ovis. It seems prob¬ 
able, however, that there is a more or less marked difference in this respect 
between the two forms. The two posterior segments in the specimen of 
T. krabbei , which are gravid, are nearly as long as broad, measuring 
about 4 mm. in length by 4.5 mm. in breadth. They are considerably 
smaller than the gravid segments of T. ovis. A distinct difference 
