ON THE REPRODUCTIVE SYSTEM IN THE HYDROIDA. 369 
canals which extend from the base to the summit of the gonophore, where 
they end in blind extremities, without any connexion with a circular canal. 
The usual condition of the adelocodonic gonophore is that of a simple, more 
or less spherical or oval sac. In Eudendrium, however, the male gonophores 
Fig. 8.—Medusa (Sarsia strangulata, Allm., provisionally) 
of unknown trophosome. 
Fig. 7. 
Male gonophore of 
Budendriwm, show- 
ing the develop- 
ment of the sper- 
matogenous tissue 
at intervals be- 
tween the ectoderm 
and endoderm. 
a, very extensile manubrium ; 4 4 b, male elements developed 
at intervals between the ectoderm and endoderm of the manu- 
brium ; ¢, ocellus. 
1863. 2B 
