86 VETERINARY PARASITOLOGY 
and there may also be present three Bothrioce- 
phalide. 
; Tenia serrata. 
Tenia marginata. 
Tzenia echinococcus. 
Tenia serialis. 
Tenia coenurus. 
| Tenia Krabbei. 
Six Cystotenize 
One Dipylidium .. Dipylidium caninum, or Tenia cucu- 
merina. 
One Mesocestoides .. Mesocestoides lineatus. 
Bothriocephalus latus (Europe). 
Three acl Bothriocephalus cordatus (Greenland). 
Bothriocephalus fuscus (Iceland). 
Fic, 22.—T4NIA SERRATA. 
a, Head; b, c, d, segments, 
Lije-History.—All the Cestoda are hermaphrodite, 
but fertilization nevertheless takes place. Either by 
rupture of the proglottis or by extrusion through the 
genital pores, the ova are liberated, and hatch into 
