ABNORMALITIES IN CESTODE MONIEZIA. 



149 



where the furrows bend. In Fig. 73 the curved portions of the 

 furrows near the right margin of the ventral surface are less dis- 

 tinct than the other portions, /. e., growth has been less all along 

 this region of the body. The appearance of the spiral arrange- 

 ment is connected with the condition of imperfect development. 

 The proglottid a, Fig. 73, being the most posterior of the series^ 

 /. e., the first formed, is the starting point of the abnormal ar- 

 rangement. In this proglottid the anterior part of the right ven- 

 tral region shows a progressive reduction in size with approach 

 to the margin. Now if the same region in each of the following 

 proglottids shows the same imperfect form the anterior boundary 



>K;. 74. 



will in each case form a curve instead of extending straight to the 

 margin. But the anterior boundary of one proglottid is the pos- 

 terior boundary of the next anterior ; thus the area which would 

 normally be included in a becomes the part of b, etc. The in- 

 distinctness of the curved portion of the furrow is due to the ab- 

 sence of the fold which normally arises at the posterior border of 

 each proglottid. In the regions where the boundary between .the 

 proglottids is transverse the fold and inter-proglottidal glands are 

 developed as usual. 



In Fig. 74 there is a close approximation to a spiral as the re- 

 sult of incomplete formation of the proglottids. The curve at 



