XII. Notes upon the experimental breeding of Tænia echinococcus in the dog from the echinococci of man

The cystic parasite,Echinococcus , is known to occur underfour forms , viz., as— 1. The Acephalocystic form. 2. Echinococcus scolicipariens. 3. Echinococcus altricipariens. 4. Echinococcus multilocularis. As regards theAcephalocystic form first described in 1804 by Laennec, it is now generally regarded as a sterile variety in which either no brood-capsules and scolices have been formed, or in which such structures have once been present, but have degenerated and disappeared.