26 
and in their new position make up the mass of the longitudinal muscle 
layer. Transverse muscle fibers, if present, are very few and weaklv 
developed. Dc^rso-ventral vJjers are likewise insignificant. 
Excbktoet system. — There are two pairs of lateral longitudinal 
excretory vessels (fig's. 32. 33) which unite in the scolex to form an 
anastomosis at the base of the rostellum. Two small closed loops 
extend into the latter, one on either side (Ming-azzini. 1899). similar 
to the loops found in TTyrnencjlejjis diminiita (p. 88) and Hyraenolejyis 
Fig. 30. — Posterior end of K. nana with sterile proglottid (third from top); camera dra'wing of 
stained preparation. Enlarged. i After Miura A: Yamazaki. 1897, pi. 14, fig. 7.) 
Fig. 31. — Portion of strohila of H. nana. Enlarged. After Stein, IS'^2. pi. 12. fig. 12. • 
carioca (see Ransom. lV*o2). The ventral vessels are larger than the 
dorsal throughout the strobila. and are united in the posterior portion 
of each seo-ment bv a transverse vessel. 
Repkoductive .system. — The sexual organs become evident as 
indistinctly defined masses of cells shortly after the first apparent 
strobilation (fig. 25). Toward the middle of the worm they are in a 
state of active sexual maturity. The nlale organs develop much more 
rapidly than the female org-ans. and become active earlier. As is 
common among tapeworms, they occupy more especially the dorsal 
