104 
breadth of the strobila (Wolfibiigel, 1900b). Wolffhiigel found that 
the two longitudinal muscle la 3 ^ers become more or less fused in the 
older segments so that they can no longer be distinguished as separate. 
Cohn (1901b, p. 320) asserts that the la^^ers in question can not be 
considered individually^ distinct at all, as they" nowhere preserve their 
identity for any considerable distance. He also differs with Wolffhu- 
gel in that he failed to find the four isolated bundles described by- the 
latter author. Zschokke (1902a, b) has noticed numerous diagonal 
libers connecting here and there the bundles of longitudinal fibers. 
Fig. 115. — Isolated proglottid of H. lanceolata: c.p., cirrus pouch; o?;., ovary; rec. sem., receptaculum 
seminis; t., testis; vt., probably the primordium of the uterus; vag., vagina. Enlarged. (After 
Feuereisen, 1868a, pi. 10, tig. 17.; 
Excretory system. — There are two pairs of lateral longitudinal 
excretory vessels, of which the ventral pair are the larger (fig. 117). 
According to Wolffhiigel (1900b) transverse canals connecting the 
longitudinal vessels are lacking, but Cohn (1901b) has found a sy"stem 
of small anastomosing canals extending across the posterior portion of 
each segment, connecting the longitudinal canals and taking the place 
of the transverse canals. The excretory vessels and the lateral longi- 
tudinal nerves pass on the ventral side of the cirrus pouch. 
Fig. 116.— Transverse section of proglottid of H. lanceolata. Enlarged. (After Megnin, 1881. pi. 4. fig. 6.) 
Reproductive system. — The reproductive organs lie in the central 
portion of the parenchyuna, i. e., inside of the longitudinal muscle 
layer, and are so distributed that the female glands occupy the sinis- 
tral third of the proglottis; the three testes and a portion of the 
seminal receptacle the middle third; and the remainder of the seminal 
receptacle, the vagina {sensu strlcto)^ the seminal vesicle and the 
cirrus pouch, the dextral third (figs. 115, 117). 
Male organs . — The three testes {t., figs. 115, 117) are oval, with 
