IMPLANTATION OF THE GLOCHIDIUM ON THE FISH 15 



13. Rabl, C. Ueber die Entwicklungsgeschichte der Maler- 

 muschel. Jena. Zeitschr. Naturw., 10, 1876. 



14. Schierholz, C. Ueber Entwicklung der Unioniden. 

 Denkschr. Akad. Wien, math.-naturw. Kl., 55, 1888. 



15. Schmidt, F. Beitrag zur Kenntnis der postembry- 

 onalen Entwicklung der Najaden. Arch. Naturgesch., Jg. 51, 

 1885. 



16. Voinea, J. Ueber die Entwicklung der Kiemen der 

 Najaden. Munchen, 1903. 



EXPLANATION OF FIGURES 



All of the figures are from camera lucida drawings made 

 with a 2 mm. oil-immersion objective. 



Figs. 1 8 are drawn from sections of glochidia of Lamp- 

 silis and Unio attached to gills of fishes. 



Figs. 9 14 are sections of glochidia of Symphynota com- 

 planata attached to fins of fishes. 



1. Cross-section of glochidium of Lampsilis ligamentina 

 15 minutes after attachment, showing mitoses in epithelial 

 tissue forming cyst. 



2. Cross-section of glochidium of Lampsilis ligamentina 

 30 minutes after attachment. 



3. Cross-section of glochidium of Lampsilis ligamentina 

 1 hour after attachment. 



4. Cross-section of glochidium of Unio complanatus 3 

 hours after attachment, showing the glochidium almost em- 

 bedded. 



5. Cross-section of glochidium of Unio complanatus 44 

 hours after attachment, showing compact appearance of tissue 

 of cyst at this stage. 



6. Cross-section of glochidium of Lampsilis ligamentina 

 84 days after attachment showing, intercellular spaces in tissue 

 of cyst. 



7. Cross-section of glochidium of Unio complanatus 11 



