19 



drought. I have been unable to obtain a single specimen for many 

 months ; and as any observations made upon these bodies must be 

 made upon very recent specimens, owing to the rapidity with which 

 their form is modified by post mortem changes, I have thought it 

 better to defer them to a future opportunity. 



EXPLANATION OF THE FIGURES, PLATE I. 



Fig. 1 . A granular body, or mass of Echinococci, contained in a delicate membranous 



envelope. 

 Fig. 2. Represents the mode in which the Echinococci are mutually attached and 



connected to a common central substance (a), vide Fig. 4, a. 

 *Fig. 3. An Echinococcus with the head, &c, protruded, the effect, probably, in this 



instance at least, of endosmosis after the death of the animal. 

 Fig. 4. a, a, a, and Fig. 2, a, Partially developed Echinococci P found intermixed 



with the more completely formed ones, in the granular bodies. 



* At page 16 it is stated that no figure of the Echinococcus with the head protruded is giveD, nor was it 

 my intention at first to exhibit one, hut I have since thought it better to substitute the present figure of an indi- 

 vidual in that condition, in place of the original " Fig. 3," which represented the creature in the opposite state. 

 Its appearance, however, in that condition, is sufficiently shown in Fig. 2. With reference to this figure I 

 would observe that the rounded projections on each side of the neck appear to be what are usually termed the 

 suckers, but I conceive they can be otherwise explained, as 1 hope to show at a future occasion, should I be 

 allowed to present some further observations on the subject. 



c 2 



