120 ENTOZOA. 



sides of the chest. Many loose and detached specimens also existed in 

 the cavity of the right pleura. The majority of those occupying the 

 chest were loosely connected to the pleura, and presented the form 

 of vesicular, semi-transparent bodies, varying in size from a filbert to 

 a large walnut ; many being united together in bundles so as to form 

 complex masses four or five times larger. One of these masses is here 

 drawn (fig. 25, p. 119). It consists of four large Coenuri, their com- 

 bined pedicles forming a single stalk which was found attached to the 

 hning membrane of the right lung. A fifth, hourglass-shaped rudi- 

 mentary Coenurus is also visible. Every Ooenurus supports a variable 

 number of lobules, each of which latter supports one or more 

 rounded eminences or papillae of tolerably uniform size. Here and 

 there the papillse resemble chains of beads. No trace of any tape- 

 worm heads could be seen with the pocket-lens, but on detaching the 

 rudimentary Coenurus, and placing it under a half-inch objective, I 

 found certain of the papillae to be nearly flat, and to present oval 

 depressions at the surface (2, fig. 25). In these instances the httle 

 eminences had been folded inwards so as to project into the cavity 

 of the larva. At the point where the peduncle joined the stalks of 

 the other Coenuri the membrane was folded in a stellate manner. A 

 distinct pellucid cuticle and granular dermis were the only struc- 

 tures visible at the smooth parts of the vesicle, but on examining 

 the larger papillae they were found to consist of several membranous 

 layers folded one within the other. These were carefully dissected 

 with the aid of needles, and each one, so examined, displayed in the 

 centre of the folds a well-formed tapeworm-head with four character- 

 istic suckers, and a prominent rostellum supporting a double coronet 

 of hooks ; thirty-two of the latter in all (3, fig. 25). The two rows 

 displayed a very marked disparity in respect of the size of the indi- 

 vidual hooks, their relative differences in form being equally conspi- 

 cuous. Each hook showed a distinct anterior and posterior root, and a 

 central granular, apparently non-chitinous matrix (4, fig. 25). The 

 head, neck, and folds of the body were abundantly supplied with the 

 so-called calcareous corpuscles. The interior of each vesicle was filled 



