Plate 25. 



Stages in the development of the parasitic generation of Pegantha smaragdina, sp. nov. 



The specimens were all taken from the peripheral canal system of the parent-host. 

 Figs. 1-9. Stages in the development of budding larvae. 



Figs. 1, 2. The youngest stages, showing the first appearance of the primary tentacle. 

 These larvae are probably the product of budding, because in larvae de- 

 veloped from the egg the primary tentacle is formed earlier, x 150. 

 Fig. 3. Slightly older stage, with two tentacles. X 150. 

 Fig. 4. The earliest stage which shows budding. The future bud is represented by a 



projection of the aboral pole. X 150. 

 Fig. 6. Slightly later stage. The bud is now partly constricted off. The tentacles are 



long, and the open mouth is visible at the oral pole, x 150. 

 Fig. 6. Later stage. Constriction of the bud is now practically complete, x 100. 

 Figs. 7-9. Larvae showing the formation of two buds before either is constricted off. 



xioo. 



Fig. 7. Earliest stage when this process can be demonstrated ; second bud being formed 



from the aboral pole of the parent larva, x 150. 

 Fig. 8. The primary bud now has one well developed tentacle, and a second smaller 



one. X 100. 

 Fig. 9. The primary bud now has an open mouth and two well-developed tentacles ; 



and it is nearly constricted off from the secondary bud. The latter presents 



the condition seen in the bud in Fig. 6. It is probable that the latter is the 



result of such a process. X 100. 



