PLATE C— continued. 



Generative System. 



Fig. 4. — a. Part of the pygofer. p. The curled and 

 fnnged penis, t. The testes, each with its vas deferens 

 and vessica seminahs, which end in the ejaculatory 

 canal, d, d. Efferent vessels, v, v. Vessicul^ semi- 

 nales. 



Fig. 5. — The testes of Aphrophora. 



Fig. 6. — A single sperm-cell, much magnified. 



Fig. 7. — Many-chambered ovary of Aphrophora, with 

 the eggs in different stages of maturity. 



The last three figures are after Burmeister. 



