COMPARATIVE CYTOLOGICAL STUDIES, WITH 



ESPECIAL REGARD TO THE MORPHOLOGY 



OF THE NUCLEOLUS. 



THOS. H. MONTGOMERY, Jr., Ph.D. 



(Lecturer in Zoologv, University of Pennsylvania.) 



From the Laboratory of the Wistar Institute of Anatomy and Biology, 

 Philadelphia. 



CONTENTS. 



page 



I. Introduction 266 



II. Review of the Literature upon Nucleoli 267 



A. Zoological Literature 26S 



£. Botanical Literature 375 



C. Synonyms of the Term Nucleolus 399 



III. Observations 400 



A. Methods of Study 400 



£. Protozoa 402 



1. Gregarine from Lineus gesserensis 402 



2. Gregarine from Carinella annulata 406 



C. Metazoa 410 



a. Egg Cells 410 



1. Montagua pilata (Verr.) 410 



2. Doto 418 



3. Amphiporus glutinosus (Verr.) 418 



4. Tetrastemma catenulatum (Verr.) Mont 423 



5. Tetrastemma elegans (Verr.) 431 



6. Zygonemertes virescens (Verr.) Montg 433 



7. Stichostemma eilhardi (Montg.) 437 



8. Lineus gesserensis (O. F. M.) 44^ 



9. Siphonophore (Rodalia ?) 45' 



10. Polydora 455 



11. Piscicola rapax (Verr.) 464 



6. Somatic Cells 472 



12. Ganglion Cells of Doto 472 



13. Ganglion Cells of Montagua pilata (Verr.) 473 



14. Ganglion Cells of Piscicola rapax (Verr.) 475 



15. Muscle Cells of Lineus gesserensis (O. F. M.) 475 



16. Muscle Cells of Piscicola rapax (Verr.) 477 



17. Blood Corpuscles of Doto 478 



18. Giant Cells of Doto 480 



