Tape-worm of Rabbits

So far as I am aware the only evidence in favour of the view that Bothriocephali present no hydatid stage is that which has been furnished by the researches of Knoch. To me it has always seemed that this evidence is insufficient fully to overcome the analogical probability that tape-worms of this genus resemble tape-worms of other genera in passing through a hydatid stage-and this notwithstanding the occurrence of a ciliated embryo. However, in my previous letter I ought no doubt to have alluded to the researches of Knoch, and should certainly have done so had my object in writing been other than it was, i.e., merely to ascertain whether anyone had as yet taken the trouble to trace the life-history of the rabbit's tape-worm.