19 
variety of Hymenolepis murma (Dujardin). This form possessed 
hooks somewhat similar to those of Hym en ole j)is nana{ — II. mitrina)^ 
but as Favarcq made no careful study of its anatomy, not even so far 
as to determine whether the genital pores were unilateral or alter- 
nating, the identit}" 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 if. ?iana. Enlarged. (After Miura & Yamazaki, 189J, pi. 14, fig. 1.) 
Fig. 10. — Head of if. nana. Enlarged. (After Mertens, 1896, fig. 2.) 
Fig. 11. — Head and anterior portion of strobila of if. 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 40 to 50 of the pos- 
terior segments contain full}^ formed embryos; in the former only the 
last 8 to 12 segments are gravid. A complete specimen measuring 12.5 
mm. possessed 162 segments. 
