PLATE LVIII 



Figure 1. The thoracic and abdominal chain of nerve ganglia 



of Ctenocephalus felis. X 66. 

 Figure 2. The second and third abdominal ganglia, more highly 



magnified. Note the separation into two bilateral 



halves, and the commissure connecting the two 



ganglia. 



Figure 3. The alimentary tract of Ctenocephahis felis. 

 Figure 4. One of the chitinous spines from the proventriculus, 



isolated. 

 Figure 5. An undeveloped ovarian tube. Such masses of cells 



are to be found in fleas which also possess mature 



ovarian tubes. 

 Figure 6. The male organs of reproduction of Ctenocephaltts 



felis. 

 Figure 7. An ovarian tube, the last egg of which is nearly 



mature. 

 Figure 8. A portion of a cross-section through the proventriculus, 



showing the chitinous rods running towards the centre 



of the cavity. Each turns backwards in the long axis. 

 Figure 9. A transverse section through the proboscis, near the 



upper end, showing the food channel, f.c., formed by 



the mandibles and epipharynx, and the salivary groove. 

 Figure 10. A transverse section through the base of the proboscis. 

 Figure 11. The salivary glands of Ctenocephalus felis. Note 



that there is a pair on each side. 

 Figure 12. The distal portion of the salivary duct, entering the 



gland. 



