324 A. RICHARDS. 



6. Nuclear divisions are not always followed immediately by 

 cell division. 



7. Only negative evidence as to the method of division in 

 somatic structures has been found ; there is no satisfactory evi- 

 dence of amitosis and mitosis is not abundant. 



8. Rapidity of growth in the somatic tissues of the cestodes 

 body does not necessarily postulate many division figures. 



LITERATURE. 1 



1. Bales, Hans Heinrich. 



Ueber die Entwickelung der Geschlechtsorgane bei Cestoden, nebst Bemer- 

 kung zur Ectodermfrage. 



2. Bardeen, C. R. 



'02 Embryonic and Regenerative Development in Planarians. Biol. Bull., III., 6. 



3. Beckwith, Cora Jipson. 



'09 Preliminary Report on the Early History of the Egg and Embryo of Certain 



Hydroids. Biol. Bull., XVI., 4. 



4. Bronn, H. G. 



'94-'oo Klassen und Ordungen des Thier-reichs, Bearbeitet von Prof. Dr. M. 

 Braun. Bd. 4. Leipzig. 



5. Child, C. M. 



'04 Amitose in Monieza. Anat. Anz., Bd. 25, No. 22. 



6. Child, C. M. 



'07 Studies on Relation between Amitosis and Mitosis. I. Development of the 

 Ovaries and Oogenesis in Monieza. Biol. Bull., XII., No. 2. 



7. Child, C. M. 



'07 Studies on the Relation between Amitosis and Mitosis. II. Development 

 of the Testes and Spermatogenesis in Monieza. Biol. Bull., XII., 3 and 4. 



8. Child, C. M. 



'06 The Development of Germ Cells from differentiated Somatic Cells in Monieza. 

 Anat. Anz., Bd. 29, Nos. 21 and 22. 



9. Child, C. M. 



'07 Amitosis as a Factor in Normal and Regulatory Growth. Anat. Ans., Bd. 

 XXX., Nos. II and 12. 



10. Child, C. M. 



'07 Studies on the Relation between Amitosis and Mitosis. III. Maturation, 

 Fertilization, and Cleavage in Monieza. Biol. Bull., XIII. 



11. Child, C. M. 



'07 Studies on the Relation between Amitosis and Mitosis. IV. Nuclear Divi- 

 sion and Somatic Structures of the Proglottids of Moneiza. V. General Dis- 

 cussion and Conclusions Concerning Amitosis and Mitosis in Monieza. Biol. 

 Bull., XII., 4. 



12. Fick, R. 



'07 Vererbungsfragen, Reduktions- und Chromosomenhypothesen, Bastardregeln. 

 Merkel und Bonnet's Ergebnisse, Bd. 16, 1906. 



1 Endeavor has been made to include in this list the more important papers refer- 

 ring to the recent trend of opinion as to amitosis, although some have no direct bear- 

 ing on the case of Tienia. In numbers I and 21 it has been impossible to give exact 

 references. 



