NO. :225s. TAENIOID CESTODES OF DOGS AND CATS— HALL. 



57 



Fig. 57. — Echino- 

 coccus granu- 

 LOSUS. Strori- 

 late tapeworm. 

 Enlarged. Af- 

 ter Leuckart, 

 1S80. 



berance. The small hooks (fig. 56) are 18 to 22 jjl long (30 to 38 ^, 

 according to Leuckart). The blade is very sliort and very little 

 curved, and tends to lie in a prolongation of the longi- 

 tudinal axis of the handle ; the handle is comparatively 

 long and narrow, with a prominent dorsal swelling 

 near the middle which causes a tapering to the distal 

 extremity ; the guard is relativel}' very much enlarged 

 and oval in outline. The suckers are 130 \i. in diameter 

 and are set well back from the rostelluni. The nock 

 attenuates posterior of the suckers and then gradually 

 increases in width to meet the anterior margin of the 

 first segment (fig. 57). This first segment is almost 

 square, about 21.0 to 260 [jl long and wide, and is rstcrile. 

 The second segment is about twice as broad in its pos- 

 terior portion as the first segment and is about foui- 

 times as long, and is mature. The third segment is 

 gravid and is much larger than the second, attaining 

 a maximum length of about 2 mm. and a width of 

 600 [/,. The longitudinal excretory canals are visible 

 and calcareous corpuscles are present. 



Male genitalia. — Testes 70 ]x in diameter and about 

 40 to 60 to the segment, most of them in the anterior 



and posterior ends and 

 on the aporal side of 

 the median field. The 

 vas deferens originates 

 near the median line of 

 the segment, anterior 

 of the ovary and on the 

 pore side of the median 

 stem of the uterus, and 

 has a few wide coils 

 before entering the cir- 

 rus pouch (fig. 58). In 

 its general course it 

 extends diagonally 

 forward to the cirrus 

 pouch, which is about 

 500 ]i. long and extends 

 almost to the median 

 line of the segment. 



Female genitalia. — 

 The ovary is horseshoe- 

 shaped (fig. 58), with 

 the median isthmus 

 and the concavity posterior is subme- 



FlG. 58.— ECHINOCOCCUS GR.VNULOSUS. FeONTAL SECTIONS 01 



mature segments. 0, ovary; s, shell-gland; y, yolk- 

 After von Erlanger, 1890. 



GLAND. Enlarged. 



narrower than the ends. 



