372 J. T. PATTERSON. 



EXPLANATION OF PLATE I. 



FIG. i. A median longitudinal section of a young polygerm. The egg from 

 which this polygerm developed was about 73 hours old. The egg was laid by a 

 fertilized female. X 385. 



FIG. 2. From the same lot as the preceding, but slightly more advanced in 

 development. X 379. 



FIGS. 3-10. All from sections of larvae on the point of hatching. About 77 

 hours old. The eggs were laid by fertilized females. X 389. 



FIG. 3. Longitudinal section of polygerm, showing a young asexual embryo 

 at upper end. 



FIG. 4. Same as preceding, with asexual embryo at lower end. 



FIG. 5. A polygerm with asexual embryo on the right. 



FIG. 6. A polygerm showing no axesual embryo. 



FIG. 7. Transverse section of polygerm, showing no asexual embryo. 



FIG. 8. Same as preceding. On the right is seen an embryonal mass in the 

 act of dividing. 



FIG. 9. Two polygerms in tissue of host. The one on the left has undergone 

 partial dissociation, while the one on the right has not yet dissociated. The latter 

 shows two asexual embryos at the upper end. 



FIG. 10. Part of a dissociated polygerm, showing a well-developed asexual 

 embryo and four embryonal masses. 



