303 



L.M.B.C. MEMOIRS. 



No. XXIII. TUBIFEX 



BY 



GERTRUDE C. DIXON, B.Sc., 



LECTURER IN BIOLOGY, KING'S COLLEGE FOR WOMEN, LONDON 



[From the Zoological Department, Kings College, London.] 



TABLE OF CONTENTS 



1. 



Introduction 



PAGE 



304 





I. 



Methods 



304 





II. 

 III. 



Historical Survey 



General Remarks 



.. 305 

 .. 308 



2. 



External Characters ... 



.. 309 



3. 

 4. 



Body Wall 



Coelom and Coelomic Fluid ... 



.. 315 

 .. 318 



5. 

 6. 



7. 



Alimentary Canal 



Circulatory System 



Nervous System 



.. 320 

 .. 326 

 .. 333 



8. 

 9. 



Excretory Organs 



Reproductive Organs ... 



I. Gonads 



341 

 .. 347 

 .. 349 





II. 

 III. 



Development and Structure of Spermatozoa 

 Sperm Sac 



... 351 

 .. 356 





IV. 



Sperm Ducts or Vasa Defercntia 



358 





V. 



VI. 



VII. 



Development and Structure of Ova ... 



Egg Sac 



Oviducts ... 



... 371 

 ... 376 

 ... 377 





VIII. 



IX. 



X. 



SpermatheciB 



Spermatophores ... 

 Cocoon 



... 378 



... 382 



387 



10. 



Parasites 





... 388 



11. 

 12. 



Bibliography ... 



Explanation of Plates 



392 

 .. 395 



U 









