DEVELOPMENT OF PARACOPIDOSOMOPSIS 41 



polar membrane. The products of these divisions are known 

 as secondary masses, which in turn multiply bj- similar con- 

 strictions to form tertiary masses. The tertiary masses later 

 divide to produce components. 



13. At some time during the period of multiplication of the 

 masses the polygerm undergoes fragmentation or dissociation. 

 The masses become scattered throughout the body cavity of the 

 caterpillar, and form new centers either for further divisions or 

 for the production of sexual embrj^os. 



14. The sexual embryos arise from tertiary components. In 

 some cases one can trace the origin of an embryo to a single 

 embryonic cell. 



15. Asexual embryos may arise as early as the primary-mass 

 stage of the polygerm, but the greater number of them develop 

 during the secondary and tertiary stages. These embryos pro- 

 duce non-viable larvae, which do not live over three days in the 

 body cavity of the caterpillar. Not over twelve to fifteen such 

 larvae arise from one polygerm. 



Austin, Texas, 



September 17, 1920 



