72 
The so-called CYSTICERCUS VISCERALIS and CYSTICERCUS TENUI- 
COLLIS HOMINIS. 
Early authors record as parasitic in man a c} r stic worm, which has 
been classified by various writers as Cysticercus tenuicollis , the larval 
stage of Taenia hydatigena (see p. 72) of dogs. Such serious doubts 
arise, however, in regard to the correctness of the zoological deter- 
mination, that these parasites, a or alleged parasites, must at present be 
considered as unidentifiable. The parasite reported by Eschricht 
(1853a) as Cysticercus tenuicollis and quoted by Diesing (1861a) as 
Cysticercus tenuicollis hominis appears to have been a true C. tenuicollis; 
but, according to Krabbe (1866b), Eschricht has since stated that he 
believes this specimen came from sheep, instead of from man. Hodges 
(1867a, b) has reported a Cysticercus tenuicollis for man in the United 
States, but Braun (1894e) considers that this specimen may equally 
well be interpreted as a C. cellulosae. 
In view of the foregoing discussion, Cysticercus teriuicollis should 
not be definitely accepted as a parasite of man unless further and 
unequivocal cases are reported. 
Specific diagnosis of Tsenia hydatigena & (figs. 120 to 123). — Tsenia ( Tsenia ) (p. 36): 
Strobila attains 1.5 to 5 mm. in length. Head reniform, about 1 mm. in diameter; 
rostellum long and narrow, armed with a double row of 30 to 44 hooks, alternating 
large (180 to 220 //) and small (110 to 160 //). Xeck rather long, nearly as broad as 
head. Segments become square about 60 cm. from head; distal border of segment 
irregularly undulate and covering proximal border of next segment like a cuff. Gen- 
ital pore slightly salient. Gravid segments 50 to 70 in number, 4 to 7 mm. broad by 
10 to 14 mm. long. Uterus with 5 to 8 lateral branches each side. Embry ophores 
nearly spherical, 31 to 36 u in diameter. 
Cysticercus stage (C. tenuicollis c ) attains considerable size, 16 cm. long by 6 to 7 
cm. broad, or even larger (fig. 123). 
a Tsenia visceralis Gmelin, 1790a; Cysticercus visceralis (Gmelin, 1790a) Zeder, 1803a; 
Finna visceralis Brera, 1809a; Cysticercus visceralis hominis Rudolphi, 1810a; “ C. visceralis 
treutleri Slawikowski, 1819.” 
^Synonyms. — Tsenia solium Linnseus, 1758a in part; T. cateniformis Gceze, 1782a; 
? T. serrata Gceze, 1782a, in part; T. marginata Batsch, 1786a; T. lupina Schrank, 
1788; T. cateniformis lupi Gmelin, 1790a; ITalysis marginata (Batsch, 1786a) Zeder, 
1803a. 
^Synonyms. — Lumbricus hydropicus Tyson, 1691; Vermes vesiculares Hartmann, 
1705b; Tsenia hydatoidea Pallas, 1760; T. hydatigena Pallas, 1766; Hydra hydcitula 
Linnseus, 1767; Vermis vesicularis eremita Bloch, 1780a; Hydatigena orbicularis Gceze, 
1782a; H. globosa Batsch, 1786a; H. oblonga Batsch, 1786a; Vesicaria orbicularis 
(Gceze, 1782a) Schrank, 1788; Tsenia simise Gmelin, 1790a; T. ferarum Gmelin, 1790a; 
T. caprina Gmelin, 1790a; T. ovilla Gmelin, 1790a; T. vervecina. Gmelin, 1790a; T. 
bovina Gmelin, 1790a; T. apri Gmelin, 1790a; T. globosa (Batsch, 1786a) Gmelin, 
1790a; ? Hydatula lienis Gmelin, 1790a; ? H. pulmonis Gmelin, 1790a; H. hepatis 
Gmelin, 1790a; H cervorum Gmelin, 1790a; H. peritonsci Gmelin, 1790a; H. solitaria 
Yiborg, 1790; Cysticercus clavatus Zeder, 1803a; C. globosus (Batsch, 1786a) Zeder, 
1803a; C. simise (Gmelin, 1790a) Zeder, 1803a; C. caprinus (Gmelin, 1790a) Zeder, 
1803a; C. lineatus Lsennec, 1804; Physchiosoma globosum (Batsch, 1786a) Brera, 1809a; 
