696 -. PROCEEDINGS OF THE NATIONAL MUSEUM. VOL. XXXIV. 
The total length of the vagina and receptaculum seminis varies 
with the age of the segments, increasing from 885 to 1,290 p. At 
the genital depression the vagina and cirrus reach the exterior by a 
short tube. The vagina extends inward as a thick-walled, relatively 
narrow tube surrounded by deeply staining cells until 1t crosses the 
longitudinal canals when it dilates to form a thin-walled, cylindrical 
receptaculum seminis extending to near the median part of the ovary. 
Here it narrows and bifurcates, one branch proceeding to the ovary 
as the oviduct and one passing through the shell gland to the yolk 
gland. From this latter branch the ootype originates near the middle 
of the shell gland and proceeds to the uterus, which at first lies dorsal 
of the median part of the ovary in this neighborhood. (Fig. 5.) 
Kges appear in utero in about the seventy-second proglottid, 5.8 
mm. back of the first appearance of the genital anlagen and there- 
fore 7.8 mm. from the anterior end of the worm.’ This is much 
earher than their appearance in (. pectinata, in which Stiles (1896) 
Han" Oa) ue Pe 
9° 0 -HOz 
2 Qcee 
Fig. 5.—DIAGRAMMATIC VIEW, SHOWING RELATION OF FEMALE GLANDS AND DUCTS IN CROSS 
SECTION ; 0, OVARY; od, OvIDUCT; ot, COTYPE; rs, RECEPTACULUM SEMINIS; sg, SHELL 
GLAND; wu, UTERUS; yd, YOLK DUCT; yg, YOLK GLAND. 
states that the first trace of the uterus occurs 14 mm. from the anterior 
end. Here, again, Stiles may have based his statement on a study 
of a toto preparation. Such a preparation of C. mosaica shows the 
uterus with eggs about 14 mm. from the anterior end. (Tig. 6.) 
The single transverse uterus is located anterior of the yolk and 
shell glands and the testes. It does not extend past the longitudinal 
excretory canals. Lyman (1902) states that the uterus in C. pec- 
tinata extends past these canals, but I was unable to confirm this 
from his specimens and it is not so figured for the European form 
by Stiles (1896). As in other species of this genus, the uterus of C. 
mosaica develops pouch-like widenings along its entire extent, the 
pouches ultimately becoming so wide that the parts between them 
appear as mere digitations extending into the lumen of the uterus. 
These pouches are relatively wider and shallower than in C. pectinata, 
giving the uterus a more regular, more nearly cylindrical lumen. 
