ruent. relatively much thicker than in the form from the rat (lig. 33), 
which is one of his reasons for viewing the forms as distinct species. 
This character, however, is very inconstant, and varies with the man- 
ner of preservation of the material, and with the age and state of 
contraction of the segments. The layer of longitudinal libers is to be 
25 
Fig. 25. — Portion of strobiia of H. nana. 1 mm. behind head; draAvn with camera lucida from fresh 
material. Shotving formation of segments begun, and primordia of reproductive organs. Enlarged. 
(After Miura & Yamazaki, 1897, pi. 14, fig. 2.) 
Fig. 26. — Proglottids of II. nana with cirrus pouch and ovary; drawn with camera lucida from fresh 
material. Enlarged. (After ^'liura A Yamazaki. 1897, pi. 14, fig. 3.) 
Fig. 27. — Proglottids of H. nana, showing cirrus pouch, seminal receptacle, ovary, and testes; draAvn 
with camera lucida from stained preparation. Enlarged. (After Miura A Yamazaki, 1897, pi. 14, 
fig. 4.) 
Fig. 28. — Proglottids of H. nana, showing cirrus pouch, seminal receptacle, immature ova, lateral 
longitudinal excretory canals; camera lucida drawing of stained preparation. Enlarged. (After 
Miura A Yamazaki, 1897, pi. 14, fig. 5.) 
Fig. 29. — Gravid proglottids of H. nana, with prominent seminal receptacles; camera drawing of 
fresh material. Enlarged. (After Miura A Yamazaki, 1897, pi. 14, fig. 6.) 
regarded as derived in part from the longitudinal subcuticular mus- 
cle fibers of the scolex and neck, in the manner described by Liihe 
(J 89d, 1896) for Anojilocejihala perfoliata and other forms, also for 
Ilymenolejns carioca (see Eansom, 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 
