454 THOS. H. MONTGOMERY jr., 
after the spermatozoa have been discharged, the testes do not collapse 
but remain of the same volume being firmly held in position by the 
surrounding parenchym (Figs. 83, 88). In the smaller males found in 
the free state immature spermatozoa are found in the most anterior 
region of the testes, and also globular bodies without nuclei. None 
of the nuclei of the lining epithelium, the germinal epithelium, were 
found in stages of mitosis. 
I have used the name “testis” for the whole extent of each of 
these sacks, while VEJDOVSKŸ has termed only the most anterior 
portion “testis”, and the remainder of the sack “Samensack”, on ac- 
count of his discovery that only the most anterior portion produces 
the sperm cells. I find, however, that each is lined throughout by 
the same kind of an epithelium, so that if one portion be called testis 
the whole extent should be. Each is without lateral diverticula, 
thereby corresponding in appearance to the uteri of the female; we 
have shown that in the female the paired uteri together with their 
numerous lateral diverticula must be considered as a pair of ovaries ; 
and the structure in the male is similar, except that the paired testes 
are without lateral diverticula. 
The vasa deferentia. Near the posterior end of the trunk 
each testis connects with a vas deferens (Vas Figs. 80, 81, Pl. 42), a 
tube of much smaller diameter lined internally by a glandular epi- 
thelium (Vas Fig. 89, Pl. 43), and externally by a sheath (Vas.S) of 
slender, deep-staining cells arranged concentrically, evidently modified 
parenchym elements; this sheath is thickest anteriorly where the vas 
joins with the testis, and does not extend forward of that region. 
The lumen of the vas is very narrow, and its lining of epithelium 
often much folded. The cuticula of the cloaca is continued for a very 
short distance along the posterior end of each vas. 
The cloaca. The posterior intestine from the mid line and the 
vasa deferentia from the sides join posteriorly to form the cloaca 
(Cl Figs. 80, 81, Pl. 42). The cloaca is lined by a cubical epithelium 
(Cl. Epi Fig. 87, PI. 43) without gland cells, covered by a thin cuticle 
(Cl. Cut). Its anterior portion lies above the cloacal ganglion (Cl. G) 
in the mid-line, surrounded by parenchym; its posterior portion (Fig. 80, 
Pl. 42, Fig. 86, Pl. 43) bends ventrad and opens on the ventral surface 
of the body just anterior to the point of junction of the two tail 
lobes. At this point its epithelium and cuticula pass continuously 
over into the hypodermis and body cuticula, so that the cloaca prob- 
ably represents a proctodaeum. Its external aperture is an elongated 
= © 4 m 
