1907.] 



FROM THE CAPE VERDE ISLAXDS. 



497 



poi'tion ia wrinkled and twisted as if it were less strong, more 

 collapsable than the other portions. 



Gonosome. — The gonophores are fixed, not developing into free 

 medusoids, and lie within the tube from which the hydranth 

 projects. They branch off from the ccenosarc of the ramulus from 

 2 to 3 mm. below the hydranth itself, and are long, slender, 

 spindle-shaped bodies, sometimes 2-5 mm. in length by 0-1 mm. 



Text-fig. 143. 



Soleniopsis dendrifonnis. Hydranth and gonopliore, X30. 



h., bulging portion at base of lij'drantb almost filling the opening of the tube ; 

 peri., perisarc ; ecto., ectoderm, represented within the tube by a dark line ; 

 erec^o., endoderm (lined) ; od., ovum; cay., central cavity of gonophore; ^o»., the 

 arrow points to the place where the gonophore branches off the general coenosarc ; 

 c<en., general coenosarc. 



in diam.eter. Their structure is simple, the goiaophore being 

 apparently a hollow cylinder closed distally, with two-layered 

 walls, a thick ectoderm and thinner endoderm, within whicla ova 

 develop to the number of about 13 or more. The ova develop 



34* 



