25 
j which is one of his reasons for viewing the forms as distinct species, 
j This character, however, is very inconstant, and varies with the inan- 
j ner of preservation of the material, and with the age and state of 
r contraction of the segments. The la}"er of longitudinal fibers is to be 
[ Fig. 25.— Portian of strobila of H. nana, 1 mm. behind head; drawn with camera lucida from fresh 
material. Showing formation of segments begun, and primordia of reproductive organs. Enlarged, 
t ■ ■ (After Miura & Yamazaki, 1897, pi. 14, fig. 2.) 
» ’ . Fig. 26.— Proglottids of II. nana with cirrus pouch and ovarj-; drawn with camera lucida from fresh 
‘ ■ material. Enlarged. (After :Miura & Yamazaki, 1897, pi. 14, fig. 3.) 
p Fig. 27. — Proglottids of II nana, showing cirrus pouch, seminal receptacle, ovary, and testes; drawn 
, with camera lucida from stained preparation. Enlarged. (After Miura & Yamazaki, 1897, pi. 14, 
' fig.-f-) 
! Fig. 28. — Proglottids of II nana, showing cirrus pouch, seminal receptacle, immature ova, lateral 
longitudinal excretory canals; camera lucida drawing of stained preparation. Enlarged. (After 
Miura & Yamazaki, 1897, pi. 14, fig. 5.) 
I ■ Fig. 29. — Gravid proglottids of II nana, with prominent seminal receptacles; camera drawing of 
I : fresh material. Enlarged. (After Miura & Yamazaki, 1897, pi. 14, fig. 6.) 
I regarded as derived in part from the longitudinal subcuticular mus- 
cle fibers of the scolex and neck, in the manner described by Liihe 
(J89d, 1896) for Anoiilocejiliala jierfoliata and other forms, also for 
I I Ilymenolepis carioca (see Ransom, 1902). Longitudinal fibers, which 
' in these regions form part of the subcuticular muscle system, as they 
pass backward, sink inward away from the cuticula, increase in size 
