19 
variet}" of Hymenolepis murina (Dujardin). This form possessed 
hooks somewhat similar to those of Hymenolepis nana{— II. murina)., 
but as Favarcq made no careful study of its anatonn^, not even so far 
as to determine whether the genital pores were unilateral or alter- 
nating, the identity of the form remains doubtful. 
Fig. 6.— Head of H. nana. Enlarged. (After Leuckart, 1863, p. 394, fig. 113.) 
Fig. 7.— Head of H. nana. Enlarged. (After Blanchard, 1886e, p. 328, fig. 3.) 
Fig. 8. — Head of H. nana from which the suckers have been torn away. (After Blanchard, 1886f, 
p. 333.) 
Fig. 9. — Head and neck of H. nana. Enlarged. (After Miura & Yamazaki, 1897, pi. 14, fig. 1.) 
Fig. 10. — Head ot H. nana. Enlarged. (After Mertens, 1896, fig. 2.) 
Fig. 11. — Head and anterior portion of strobila of H. nana. Enlarged. (After Stein, 1882, pi. 12, fig. 11.) 
Blanchard (1891a) considers 12 to 15 mm. the normal length in man, 
with a maximum breadth of 0.5 to 0. 7 mm. The number of segments 
ranges from about 110 to 200; in the latter case -10 to 50 of the pos- 
terior segments contain fully formed embryos; in the former only the 
last 8 to 12 segments are gravid. A complete specimen measuring 12.5 
mm. possessed 162 segments. 
