VOL. XXXIX, No. 463 JULY, 



THE 



AMERICAN 

 NATURALIST 



A MONTHLY JOURNAL 



DEVOTED TO THE NATURAL SCIENCES 

 IN THEIR WIDEST SENSE 



CONTENTS 



Page 



I. Eestoration of the Titanothere Megacerops . PROFESSOR R. 8. LULL 419 

 II. Synopses of North American Invertebrates. XXI. The Nemerteans. 



Part I PROFESSOR W. R. COE 425 



III. Studies on the Plant Cell. -VI DR. B. M. DAVIS 449 



IV. Notes and Literature: Zoology, McMurrich's Human Embryology, The 



Arthropods and Coelenterates of the Maldive and Laccadive Archipel- 

 agoes, Townsend's Birds of Essex County, Massachusetts, Notes . . 501 

 V- Correspondence : A Biological Station in Greenland, Fleas and Disease . 505 



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