536 W. B. HAEDT, 



If no such link existed, and if, therefore, the animal were 

 unable to direct its entire resources towards the accomplish- 

 ment of any metabolic act, we should expect to find evidence of 

 the fact in the more marked exhaustion of the endoderm during 

 starvation in the immediate neighbourhood of a gonophore as 

 compared with the other parts of the blastostyle or of the 

 body generally. But such evidence appears to be wanting. 



EXPLANATION OF PLATES XXXVI & XXXVII, 



Illustrating Mr. Hardy's memoir "On some Points in the 

 Histology and Development of Myriothela phrygia." 



Fig. 1. — Section through the ectoderm of the distal portion of a blasto- 

 style. [Animal killed in May.] 



Fig. 2. — Section of the ectoderm of the gonophore-bearing region. [Ani- 

 mal killed with osmic acid in May.] fV^h ob. 



Fig. 3. — Teased preparation from the same specimen. The primitive germ- 

 cells have dropped out. -j^gth ob. 



Fig. 4. — Section through the generative region of an exhausted animal 

 killed in autumn. 



Figs. 5, 5«, 55. — Ectoderm elements isolated by teasing. Osmic acid. In 

 5 and 5 a are represented parts of the nerve network. 



Fig. 6. — Isolated primitive germ-cells. Osmic acid, ^th ob. 



Fig. 7. — Section showing the process of absorption of the supporting 

 lamella. 



Fig. 8. — First stage in the formation of a gonophore. Ectoderm thickened 

 and containing a cluster of primitive germ-cells in its lowest part. 



Fig. 9. — The second stage in the formation of a gonophore. 



Fig. 10.— The third or blastema stage. 



Fig. 11. — A completely formed young gonophore. 



Fig. 12. — Piece of the cuticle which covers the ectoderm stripped off. 

 ^,-th ob. 



