Fig. 26. Spermatozoon, showing constriction at middle of head. The
head is also somewhat contorted. × 670.
Fig. 27. Spermatozoon. Pear shaped head. × 670.
Fig. 28. Spermatozoon. The head is quite long, and pointed at its
posterior end. × 670.
Fig. 29. Spermatozoon, showing a constriction at middle of the
head. × 670.