ABNORMALITIES IN MONIEZIA EXPANSA. 



97 



(Rindenschicht of various authors). This contains a few widely 

 scattered nuclei. The most conspicuous muscle-layer at this 

 stage is the well-developed longitudinal muscle-layer indicated in 

 the figures. Other muscles are not shown. Within the muscle- 

 layer the central region of the proglottid is occupied by paren- 

 chyma. This portion of the parenchyma surrounded by the 

 longitudinal muscle layer may be called the central parenchyma 

 (Mittelschicht). In it lie the large ventral and the smaller dorsal 

 nephridial canals and the lateral nerve cords. 



In the central parenchyma the nuclei are more abundant than 



FIG. 44. 



in the peripheral layer, and, as the figures show, they are rather 

 more numerous in the outer parts of the parenchyma, especially 

 between the nephridial canals and the muscle-layer. 



FIG. 45. 



The two longitudinal sections, Figs. 44 and 45, show the same 

 structures. Fig. 44 is drawn from a frontal section about half 

 way between the scolex and the first distinct proglottids"[in the 

 plane of the line 44, Fig. 53 (p. 103). Here the nuclei of the 



