CONTENTS OF VOL. 1. 



No. I. — September; 1887. 



PAGE 



I. Prof. R. Ramsay Wright, and A. B. Macal- 

 LUM, University College, Toronto, Canada. 



Sfhyranura Osleri., a contribution to 



American Heltninthology . . . 1—48 



II. Dr. J. S. KiNGSLEY, State University, Blooming- 

 ton, Ind. 



The Development of the Compound Eye 

 of Crangon ...... 49-66 



III. Dr. William Patten, Assistant in the Lake 



Laboratory, Milwaukee, Wis. 



Eyes of Molluscs and Arthropods . . 67-92 



IV. Dr. G. Baur, Assistant in Yale College Museum, 



New Haven, Conn. 



On the Philogenetic Arrangement of the 



Sauropsida ...... 93-104 



V. C. O. Whitman, Director of the Lake Labora- 

 tory, Milwaukee, Wis. 



A contribution to the History of the Germ- 

 layers in Clepsine ..... 105-182 



VI. Prof. E. B. Wilson, Bryn Mawr College, Bryn 

 Mawr, Pa. 



The Germ-bands of Lumbricus . . 183-192 



VII. Dr. William Patten, Assistant in the Lake 

 Laboratory, Milwaukee, Wis. 



Studies on the Eyes of Arthropods. 



I. Development of the Eyes of Vespa, 

 with Observations on the Ocelli of some 

 Insects 193-326 



