384 DR. ALLMAN ON THE ANATOMY AND PHYSIOLOGY OF CORDYLOPHORA. 
Fiff. 21. The same, showing the pyriform figure which it frequently assumes. 
Fig. 22. Embryo subsequently to its locomotive stage ; the cilia have disappeared, 
and it has become permanently fixed by one extremity. 
Fig. 23. Further progress in the development of the young polype ; the tentacula 
have begun to bud forth, and the stem is already surrounded by a delicate 
polypary. 
Fig. 24. Male capsule with its contents. 
a. Capsule with the contents escaping under slight pressure. 
b. Caudate cells liberated from the capsule. 
c. Spermatozoa. 
