43 
Habitat. — Adult in intestine of dogs {Cams familiar is) and other canines. Cysti- 
cercus in peritoneal cavity of rabbits (Lepus cuniculus), hares (L. timidus , L. varia- 
bilis) , mice {Mus musculus) , etc. 
Geographic distribution. — Very extensive, probably more or less cosmopolitan. 
Medical significance. — Vital (1874) reports this tapeworm for 
man in one case in Algiers, but legitimate doubts arise regarding the 
correctness of his zoological determination. 
Fig. G4. — Apex view of same, x 28. (After Stevenson, 1904, pi. 6, fig. 49.) 
Fig. 65. — Portion of mesentery of rabbit infected with Cysticercus pisiformis. Natural size. (After 
Railliet, 1893a, 216, fig. 114.) 
The Thick Necked Cat-Tapeworm — TZENIA TENIZEFORMIS « (Bloch, 1780) 
Stiles & Stevenson, 1905. 
[Figs. 66 to 67.] 
Specific diagnosis.' — Strobila attains 15 to 60 cm. in length. Head thick, cylin- 
drical anteriorly, 1.7 mm. broad; rostellum short, armed with a double row of 26 to 
52 hooks; alternating large (380 to 420 // ) and small (250 to 270 // ) ; suckers very promi- 
nent. Neck not distinct, as broad or broader than head. Anterior segments very 
short, the following cuniform, the terminal 8 to 10 mm. long by 5 to 6 mm. broad. 
Embryophore globular, 31 to 37 ja. 
Cysticercus: C. fasciolaris elongate, 3 to 20 mm. long, with small terminal caudal 
vesicle. 
« Synonyms. — Txnia collo brevissimo Bloch, 1782a; T. serrala Goeze, 1782a; ?T. globu- 
lata Gceze, 1782a; ‘IT. moniliformis Batsch, 1786a, not Pallas, 1781; T. serrata felis 
Gmelin, 1790a; T. felis Gmelin of Carlisle, 1794a; Alyselmmthns serratus (Gceze, 
1782a) Zecler, 1800a; Halysis serrata (Gceze, 1782a) Zecler, 1803a; Txnia crassicollis 
Budolphi, 1810a; T. serrata a, cad domest. b, sylvestr. Schrank of Budolphi, 1810a; 
Halysi serrata (Goeze, 1782a) Budolphi, 1810a; Halisis serrata (Zeder) of Goldberg, 
1855a; Txnia crassicolis Koeberle, 1861a. 
& Synonyms. — Vermis vesicularis muris Hartmann, 1695b; Fasciola muris hepadcx 
Borderer, 1762; Txnia hydadgena Pallas, 1766, in part; T. hydadgena murini liepatis 
Pallas, 1766; Vermis vesicularis tenixformis Bloch, 1760a; Fasciola sp. Merrem, 1781; 
F. saccata Merrem of Goeze, 1782a; Megocephalos Goeze, 1782a, type; ? Pseudoechino- 
rhynchus sp. Goeze, 1782a; Txnia {Hydadgena) vesicularis fasciolata Goeze, 1782a; T. 
hydadgena Werner, 1782; T. vesicularis txnix formis Bloch of Werner, 1782; Vermis 
vesicidaris txnixformis Bloch of Batsch, 1786a; Hydadgena txnixformis Batsch, 1786a; 
