694 PROCEEDINGS OF THE NATIONAL MUSEUM. VOL. XXXIV. 
two or three irregular, vertical rows, so that the number of testes 
which from a dorsal view appears to be between 36 and 40, is found in 
cross section to be about 60 to 80 to each proglottid. C. pectinata has 
100 to 125, C. variabilis 60 to 100. The testes are approximately 
globular to oval in shape, ranging in diameter from 60 to 90 p. Each 
testis consists of a number of lobules which resemble in section a 
cluster of grapes, the whole inclosed in a capsule which defines the 
testis sharply from the neighboring parenchyma. 
On each side of the proglottid the vas deferens is formed by the 
union of two tubules, one of which originates near the middle of the 
proglottid and the other near the margin. These unite just behind 
the median lobe of the ovary to form the vas deferens. Each testis 
connects with the tubule by a short duct. (Fig. 3.) 
The vas deferens forms.a series of vertical loops, extending’ just 
median of the longitudinal excretory canals for a space of 405 to 
550 p, then runs straight across these canals to the beginning of the 
1/10 mn. 
Fic. 3.—FRONTAL SECTION NEAR MARGIN OF SEGMENT. c, CIRRUS; cp, CIRRUS POUCH ; 
ec, EXTERNAL EXCRETORY CANAL; ic, INTERNAL EXCRETORY CANAL; mn, MAIN NERVE 3 
0, OVARY ; 78, RECEPTACULUM SEMINIS; Sg, SHELL GLAND; t, TesTES; tc, TRANSVERSE 
EXCRETORY CANAL; U, UTERUS; V, VAGINA; vd, VAS DEFERENS; vs, VESICULA SEMINALIS $ 
yg, YOLK GLAND. 
cirrus pouch. (Figs. 8 and 4.) This latter measures 475 to 640 » in 
length, averaging 550 p, and is wholly lateral of the longitudinal 
canals. In @. pectinata the cirrus pouch is 925 to 1,075 » long and ex- 
tends median of the excretory canals. In 0. perplexa it is only 288 
to 320 » long, and in C@. variabilis 400 ». At its proximal end the cir- 
rus pouch is 62 » in diameter, thinning toward the distal end to 38 p 
and then slightly increasing in size again. Inside the cirrus at its 
proximal end is a vesicula seminalis the length of which varies greatly, 
depending possibly on variations in the pressure of the cirrus pouch 
muscles. The extremes noted for its length are 129 and 337 p. 
The outer layer of longitudinal muscles of the cirrus pouch is about 
3 p thick, the inner circular layer about 5 » thick, the cirrus about 
6 ». The cirrus pouch proceeds anterior and dorsal of the vagina 
nearly to the genital pit where they both open in the same frontal 
plane, often bending sharply forward near the end. The genital 
aperture is located in the anterior half of the proglottid margin, in 
