TABLE OF GENERA 603 



II. Segment Broader than Long. 



Except in the terminal segments, which are equilateral or slightly longer 

 than broad — T. philippina, 



B. Specimen is a Cysticercus. 



I. Small bladder- worm with one scolex — TcBnia. 

 (a) Head armed — T. solium. 



{b) Head unarmed (very rare, if ever present) — T. saginata. 

 II. Large bladder- worm with brood capsules, inside which are the 

 scolices — Echinococcus. 



C. Specimen is an Egg. 



I. With an operculum — Dibothriocephalidce. 



68 to 71 /X X 45 to 50 jLi — D. latus. 



75 to 80 ^ X 50 jbi — -D. cordatus. 



63 X 48 ^ to 50 fji, brownish— D. grandi<;. 



Fig. 246. — Dibothrio- Fig. 247. — Tcsnia Fig. 248. — Dipylidium 



cephalus latus. solium. caninum. 



Figs. 246-248. — ^Eggs of Cestode Worms from Human F^ces. 

 (From photographs by J. J. Bell.) 



II. Without an operculum and with a six-hooked embryo — TcBniidcs. 



{a) Egg with a thick, radially-striated, inner shell or embryo- 

 phore — TcBniincs. 



(a) Embryophore round or oval, 39X 33 A*. Africa — 



T. africana. 



(b) Embryophore oval, whitish to yellow, 39 X 30 /u, 



America — T. confusa. 



(c) Embryophore, 38 X 30*4 /x. Africa — T. bremneri. 



(d) Embryophore oval, 35 to 41, X 26 to 35 [jl. Philip- 



pines — T. philippina. 



(e) Embryophore, ovoid, rusty brown, 35 to 40 /x X 20 to 



30 jji. Cosmopolitan and common — T. saginata. 



(f) Embryophore almost round; brown; 31 to 36 fju. Not 



uncommon in the tropics — T. solium. 



(g) Egg and embryophore unknown. Asiatic Russia — 



T. hominis. 



{b) Egg with a thin, membranous inner shell. 

 (i) Not in Capsules — Hymenolepis. 



(a) Egg oval or globular, with two distinct membranes- 

 outer 30 to 60 /jL, inner, 16 to 34 — mammillate 

 projection at each pole — H. nana. 



