124 NATHAN FASTEN. 



PLATE II. 



Explanation of Figures. 



4. Dorsal view of the posterior extremity of a mature male, showing the position 

 of the various parts of the reproductive organs. X 144. 



5. Sagittal section through the third lobe of the vas deferens and the spermato- 

 phore. The canal-like tube (can.), that conducts the spermatozoa is seen in v.d. 3. 



X 560. 



6. Frontal-section through the spermatophores, showing their structure. X 800. 



7. Cross-section through a spermatophore slightly above its central region, 

 showing its structure. X 1,240. 



