JOURN. Q.M.C. 



Ser. 2, Vol. XI., PI. 11 



FiR-. 1. 



Fig-. 3. 



Fig-. 2. Fig. 4. 



T. A. O'DoNOHOE, phoiomicrogr. 



Spermatozoa of the Blow-fly and Flea. 



