CONTENTS OF VOLUME XIII. 



No. i. June, 1907 



O. C. Glaser. Pathological Amitosis in the Food-ova of 



Fasciolaria 1 



Bektram G. Smith. The Life History and Habits of Crypto- 



branchus allegheniensis 5 



Helen Dean King. Food as a Factor in the Determination of 



Sex in Amphibians 40 



No. 2. July, 1907 

 Kristine Bonnevie. " HeterotypicaV Mitosis in Nereis lim- 



bata {Ehlers) 57 



Roy L. Moodie. The Sacrum of the Lacertilia 84 



Pauline H. Dederer. Spermatogenesis in Philosamia cynthia. 94 



No. 3. August, 1907 



Max M. Ellis. The Influence of the Amount of Injury upon the 

 Rate and Amount of Regeneration in Mancasellus macrourus 

 (Garman) 107 



J. F. McClendon. The Spermatogenesis of Pandarus sinuatus 



Say 114 



J. Thomas Patterson. The Order of Appearance of the Ante- 

 rior Somites in the Chick 121 



Adele M. Fielde. Suggested Explanations of Certain Phenom- 

 ena in the Lives of Ants ; with a Method of Tracing Ants to 

 their Respective Communities 134 



C. M. Child. Studies on the Relation between Amitosis and 



Mitosis , III 138 



Harold Heath. The Longevity of Members of the Different 



Castes of Termopsis angusticollis 161 



No. 4. September, 1907 

 C. M. Child. Studies on the Relation between Amitosis and 



Mitosis, IV.- VL. 165 



William M. Wheeler. On Certain Modified Hairs Peculiar 



to the Ants of Arid Regions 185 



Theodore C. Burnett. Can Sea Water Maintain the Beat of 



the Heart of Fresh Water Animals ? 203 



Edwin Chapin Starks. On the Relationship of the Fishes of 



the Family Siganidce 211 



Gary N. Calkins. The Fertilization of Amceba proteus 219 



