IA1 FORMING UTDR0ID8. 





era! round sacs, or "medusa-bads" which produce either 

 male or female medusas. These medusa-buds are like the 

 free -medusa )ryne. The marine fclydroids, then, are 



I 90.— Animal "f \fillepora nodosa. , ( . nutritive z> ►< >i« 1 : >>. reproductive 

 iid; o, lasso-cell; d, the same coiled up in Its cell; e, a third form. All 

 highlj magnified. 



usually of distinct si . growing by colonies, which are 

 either male or female. 



The minute animals of Millepora 

 Becrete large coral-like masses on the 

 - of Florida and the Pacific < Icean. 

 The name is derived from the num- 

 berless minute holes or pons scattered 

 over the Burface in which the nutritive 

 (Fig. 20, a) and reproductive zooids 

 i Fig. 20, A) liw. On breaking off p 

 of the living coral one's hand is stung 

 ami made Bore for diivs bv i In- stings 

 from the lasso-cells, so poisonous is this 

 coral-like growth ( Fig-. 20, c, d. > ). 



A common Hydroid <>n our north-Fio 21 Poiypit» of i 



l • .1' / • 1 ■ ni\ t«, with 



em snores is the Uoryne (rig. 21), a medusa-bud m & 



1 • 1 1 it ■■ 1 1 11 Much i-iilar ■• 



which dilirrs I nun t \w foregoing kinds 



iii producing a free bell-like form called a medusa ur 



