37 
present; vitellogene gland triangular, one side parallel to posterior margin of the 
segment. Larva a cysticercus which lives in mammals; adults in intestine of meat- 
eating mammals. 
Type species. — Tania so/ him Linnaeus, 1758. 
The Pork Tapeworm — TZENIA SOLIUM « Linnaeus, 1758. 
[Figs. 54 to 61.] 
Specific diagnosis. — Taenia ( Taenia ) (p. 36) : Strobila attains 2 to 3.5 meters or more 
in length, greatest breadth 7 to 8 mm.; composed of about 800 to 900 segments. 
Head globular, 0.6 to 1 mm. in 
diameter; rostellum short but 
prominent; hooks 22 to 32 in 
number, alternating large (160 
to 180 p) and small (110 to 
140 //) ; suckers 0.4 to 0.5 mm. 
in diameter. Unsegmented 
neck present. Genital pores 
irregularly alternating, slightly 
back of equator of segment. 
Sexually mature proglottids 
measure 2.5 to 3 mm. long by 
4.5 to 5 mm. broad; vagina with 
setae; part of smaller ovarian 
lobe (on pore side of segment) 
cut off by vagina, lobes trans- 
versely oval; testicles 0.12 to 
0.15 mm.; seminal vesicle ab- 
sent; length of cirrus pouch? 
Gravid (end) proglottids attain 
10 to 12 mm. long by 5 mm. 
wide; uterus with 7 to 14 thick, 
lateral, dichotomous branches 
each side. Calcareous corpus- 
cles sparse, attain 0.012 mm. 
Eggs oval or almost round, shell 
thin and usually destroyed; 
embryophore thick, yellowish 
to dark brown, 31 to 36 jli. 
Cysticercus: C. cellulosx , & 
ellipsoid, 6 to 10 mm. long by 5 to 10 mm. broad, with a white spot corresponding 
to the invaginated head; head as in adult; the bladder contains but little fluid. 
Habitat. — Adult in small intestine of man; experiments to bring about intestinal 
infections in swine, dogs, guinea pigs, rabbits, and apes ( Macacus cynomolgus ) have 
been negative. Cysticercal stage in muscles of wild boar (Sus scrofa ) and swine 
(#. scrofa domestica); occasionally in man ( Homo, sapiens ); also reported for mous- 
tached monkey ( Cercopithecus Cephas), patas guenon (C. patas) , barbary macaque 
a Synonyms. — Taenia solium Linnaeus, 1758a, s. str. , after elimination of T. saginata 
and T. liydatigena ; T. cucurhitina Pallas, 1766, and Bloch, 1782a; T. cucurbitina pellu- 
cida Goeze, 1782a; T. cucurbitina, plana , pellucida Goeze, 1782a; ? T. vulgaris Werner, 
1782 (not Linnaeus, 1758), renamed T. dentata Batsch, 1786a (not Nicolai, 1830) ; 
T. solitaria Leske, 1784 or 1785 (not accessible, see Seeger, 1852); T. plana pellucida 
Goeze, 1782 of Gmelin, 1790a; Tenia armata umana Brera, 1802a; Haly sis solium (Lin- 
naeus, 1758) Zeder, 1803a; Taenia armata hominis Brera. 1808a; T. humana armata 
Fig. 54. — An isolated Pork-measle Bladder Worm (Cysticercus 
cellulose), with extended head. Greatly enlarged. (After 
Stiles, 1898a, 90, fig. 76.) 
