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THE BEGINNINGS OF LIFE. 



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. 



ic) Budding, without separation. ^ ^ . , , ^, 



\d\ Budding without separation at first, though subsequently 



separation of some or all of segments. 

 {e) Reproduction by fertilized germs. 



A. Multiple derivative forms— ' ^l^r'OZ.tQ generation.* 



I. 



Distoma germ, {a) 

 ist Brood, {a) 

 2nd Brood, {a) 

 3rd Brood (Cercadse). 



Encysted state. 



Distoma larva. 



Mature Distoma. (^) 



Fern germ, {c) 

 Immature Fern, (r) 

 Mature Fern, {b) 



Spores, {c) 



Prothallium. {e) 



7, Atirelia germ. 

 Ciliated Embryo. 

 Polype, {cd) 

 Medusae, {e) 



■2. Moss germ, {b) 

 Protonema. {d\ 

 Protonema. \e) 

 Incipient Moss. {(^ 

 Mature Moss. {e\ 



T. echinococciis germ. 

 Active Embryo, 

 Hydated Cyst, {cd) 

 Echinococci. (c) 

 Mature Entozoon. [^\ 

 Proglottides. (<r) 



4- 



5. Myrianida germ, {c) 

 Larva, {cd) 

 Mature Myrianidae. {e\ 



6. 



T. serrata germ. 

 Active Embryo. 

 Cysticercus. {cc) 

 Mature Entozoon, 

 Proglottides. (4 



m 



8. Sertularia germ. 

 Ciliated Embryo. 

 Polypidom. {d) 

 Capsules, {a) 

 Medusae. {e\ 



\c) 



10. Salpa germ. 



Larva Stock. {dd\ 

 Mature Salpap. {e) 

 (aggregated) 



ij. Flowering Plant germ. {cd\ 

 Immature Plant, (c) 

 Mature Plant, {e) 

 {aggregated) 



9. Coryne germ. 



Ciliated Embryo. {<:) 

 Polypidom. {d) 

 Polypidom. \d) 

 Medusae, {e) 



13 Aphis germ. 



Immature Aphis, {a) 

 Immature Aphis. \a) 



&c. 

 Mature Aphis. (4 



* 



B. Process intermediate between * budding' and metamorphosis— product of Larva single 



13. Asterias germ. 

 Bipinnaria. {a) 

 Immature Asterias. 

 Mature Asterias. (e) 



14. Echinus germ. 



Pluteus. {a) 

 Immature Echinus 

 Mature Echinus, {e) 



C. Complete development of germ stock— with muUiplicatio7i and metamorphosis. 



n- 



Botry lilts gerhi (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. 

 Mature Bryozoa. 

 (aggregated) 



{c\ 



D. Complete development of germ— -with or without multiplication^ but with no 



7nctamorphosis, 



18. 



Hydra germ. 

 Immature Hydrae. \d) 

 Mature Hydra. {e\ 



19. Eolis germ. {b\ 

 Immature Eolis. 

 Mature Eolis. (<?) 



21, Vertebrate germ. 

 Asexual Vertebrate. 

 Mature Vertebrate, {e) 



20. Vertebrate germ, {b) 

 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 compariso-ns and appreciation of real relationships. 



