DEVELOPMENT OF TAPE-WORMS. 113 
through multiplication by division of the nucleus (germi- 
aative cell). In the eggs of Tenia bacillaris E. Van Beneden 
Fig. 73.—Tenia solium. Nat. size, Fig. 74.—Head and proglottis of 
with the head magnified. Strobila stage. T. solium.—After Beneden. 
—After Beneden. 
saw the nucleus subdivide ; after passing through a morula 
condition the cells are arranged in two layers, and the outer 
