THE BEGINNINGS OF II FE. 



567 



MODES OF DEVELOPMENT 



IN RELATION TO 



ASEXUAL MULTIPLICATION OCCURRING DURING ITS PROGRESS. 



Explanation 

 of signs. 



(a) Signifies internal gemmation. 



\b) Signifies fission or external gemmation. 



\c) Budding, without separation. 



\cC) Budding without separation at first, though subsequently 



separation of some or all of segments. 

 (e) Reproduction by fertilized germs. 



A. Multiple derivative for 



■alternate generation." 



I. Distoma germ, (a) 

 ist Brood, (a) 

 2nd Brood, (a) 

 3rd Brood (Cercariae). 



Encysted state. 



Distoma larva. 



Mature Distoma. (*) 



4. Fern germ, (c) 

 Immature Fern, (c) 

 Mature Fern. (*) 



Spores, (c) 



Prothallium. (e) 



7. Aiirelia germ. 

 Ciliated Embryo. 

 Polype, (cd) 

 Medusae, (e) 



Moss germ, (b) 

 Protonema. (d) 

 Protonema. (<r) 

 Incipient Moss, (d) 

 Mature Moss, (e) 



5. Myriattida germ, (c) 

 Larva, (cd) 

 Mature Myrianidae. (e) 



Sertularia germ. 

 Ciliated Embryo, (c) 

 Polypidom. {d) 

 Capsules, (a) 

 Medusae, (e) 



3. T. echinococcus germ. 

 Active Embryo. 

 Hydated Cyst, (cd) 

 EchinococcL (c\ 

 Mature Entozoon. (b) 

 Proglottides, (e) 



6. 71 serrata germ. 

 Active Embryo. 

 Cysticercus. (cc) 

 Mature Entozoon. \b\ 

 Proglottides, (e) 



9. Coryfie germ. 



Ciliated Embryo, (c) 



Polypidom. (d) 

 Polypidom. (d) 

 Medusae, (e) 



ro. Salpa germ. 



Larva Stock, (dd) 

 Mature Salpae. (e) 

 (aggregated) 



II. Flowering Plant germ, (a^ 

 Immature Plant, (c) 

 Mature Plant, (e) 

 (aggregated) 



12 Aphis germ. 



Immature Aphis, (a) 

 Immature Aphis, (a) 



&c. 

 Mature Aphis, (e) 



B. Process intermediate bet-ween 'budding' and metamorphosis— prodzict of Larva single. 



13. Asterias germ. 

 Bipinnaria. (a) 

 Immature Asterias. 

 Mature Asterias. (e) 



14. Echinus germ. 

 Pluteus. (a) 

 Immature Echinus 

 Mature Echinus, (e) 



Complete development of germ stock— with multiplication and metamorphosis. 



15. Botryllus germ (b) 

 Immature Botrylli. (c) 

 Mature Botrylli. (e\ 

 (aggregated) 



16. Ascidian germ. 



Tadpole-like larva. 



Fixed Ascidian. (c\ 



Mature Ascidians. (e) 



(aggregated) 



17. Bryozoa germ. 

 Ciliated Embryo. 

 Fixed Bryozoan. (c\ 

 Mature Bryozoa. 

 (aggregated) 



Complete developtnent of germ — with or -without multiplication, biU -with ho 

 fnetamorphosis. 



Hydra germ. 

 Immature Hydras, (rf) 

 Mature Hydra, (e) 



Eolis germ, (b) 

 Immature Eolis. 

 Mature Eolis. (e) 



Vertebrate germ. (*) 

 Asexual Vertebrate. 

 Mature Vertebrate, (e) 



21. Vertebrate germ. 

 Asexual Vertebrate. 

 Mature Vertebrate, (e) 



* Some of the most typical modes have been selected and stated in the simplest manner, with 

 the view of facilitating comparisons and appreciation of real relationships. 



