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THE AMERICAN NATURALIST. [Vol. XXXVII. 



5. The medusoid is developed from a bud which is formed 

 by a simple outgrowth of the wall of the peduncle. 



6. The chymiferous canals of the medusoid are formed by a 

 fusion of the two layers of entoderm throughout the inter-radial 



7. The sex cells are derived from a plug of ectodermal cells 

 formed at the apex of the bud. 



8. The eggs develop by a process of absorption of the cells 

 of the germinal tissue, thus giving rise to an amoeboid syncytium. 



9. The nuclei of the primitive germ cells persist for some 

 time in this syncytium, but gradually disintegrate. 



April 25, 1903. 



BIBLIOGRAPHY. 



