230 The Management and Diseases of the Dog. 
native dogs. I have elsewhere characterised the larva of 
this parasite as the slender-necked hydatid (F7e/d, Feb. 22, 
1873). The accompanying illustration, from the learned 
Pastor Goeze’s work, shows the hydatid (Cysticercus 
tennuicollis) of the natural size at A, Fig. 28 ; whilst the 
letter B represents a magnified view of the head, display- 
ing the suckers and double crown of hooks.” 
The Hydatid Tapeworm.—* Of all the entozoa infesting 
mankind and animals, the little Zena enhinococcus is one 
of the most remarkable. The larve form the common 
hydatids, or bladder worms, of veterinarians (Zchinococcus 
velerinorum), 
“As in the dog the full-grown tapeworm only reaches 
the third of an inch in length, it is difficult for the non- 
professional man to realise the fact that the same entozoon 
FIG. 29. 
HYDATID TAPEWORM AND ECHINOCOCCUS HEAD. .(COBBOLD.) 
in its larval or vesicular state attains a size many thousand 
times exceeding that of the parasite in its adult condition. 
Harmless when full-grown, it is fearfully a. ‘ructive to life 
