1 9 14] A New Cestode from Ami a Calva L. 83 



appendages with those of the terminal disc stand out as thin leaf-like 

 structures, concaved anteriorly, thus suggesting their probable use as 

 accessory organs of attachment ("Stiitzorgane") to the wall of the host's 

 intestine. The bothria, although provided with a well-developed 

 musculature (vide infra) , would seem to be incompetent to securely 

 fasten the worm; possibly the appendages of the scolex and foremost 

 proglottides may combine to act as temporary suckers, as suggested by 

 several authors. Unfortunately no observations on the methods of 

 attachment were made on the living animals. 



On passing backwards, the joints are seen to elongate considerably, 

 especially in all parts ahead of the ring of appendages which remain 

 relatively more constant in size. A transverse section through the 

 former is oblong in shape, while one through the latter is more broadly 

 elliptical to circular in outline. This part of the strobila is the most 

 mobile, elongation often reaching the degree mentioned above in which 

 the appearances are quite like a knotted thread. Fig. 2 shows different 

 degrees of contraction in a portion of the chain, but it can be seen that 

 the middle joint is naturally somewhat shorter than the other two. In 

 many chains this region is subject to considerable variation. It was 

 observed that now and then one of the longest proglottides was provided 

 with one or two additional pairs of appendages, generally abortive and 

 situated anteriorly some distance apart. In a few cases staining and 

 clearing brought out a distinct division of the parenchyma, especially 

 posteriorly, into what seems to be the beginnings of a division of the 

 longer proglottis into several smaller ones. Furthermore in one strobila 

 an undivided region was intercalated between two jointed regions, the 

 the second of which was followed by the normal posterior end. Young 

 scolices are shown in Figs. 5 and 6. (In this connection note evidence 

 given below under the excretory system that the latter are incomplete). 

 Although the foregoing facts point to possibly occasional augmentation 

 in the number of proglottides in this region in adult worms, the usual 

 appearances are as described below. 



Beginning at the 15th to 17th, the proglottides enlarge somewhat 

 abruptly until the size shown in Fig. 3 is reached. The dotted ovals here 

 represent the gravid uteri which give rise to the distended appearances 

 of the posterior two-fifths, or nearly, of the joints. There is also some 

 increase in width anteriorly. On the other hand the auricular appen- 

 dages gradually diminish in size, until after the 23rd or 24th joint they 

 are not to be seen, the strobila then resembling a ribbon swollen at regular 

 intervals, as mentioned above. For some distance farther the remains 

 of the constrictions of the anterior ends of the joints are seen in slight 

 approaches of the lateral borders, while still farther back a tendency 



