iv CONTENTS. 



Pages 



III. Harris M. Benedict. 



On the Si nut tire of Two Fish Tapeworms 

 from the Genus Proteoceplialus Wein- 

 land 1858 337-368 



IV. Samuel J. Holmes. 



The Early Development of Planorbis . 369-458 



No. 3. — August, 1900. 



I. William Patten and Annah Putnam Hazen. 

 The Development of the Coxa I Gland, 

 Branchial Cartilages, and Genital Ducts 

 of Limulus Polyphemus 459—502 



II. Henry McElderry Knower. 



The Embryology of a Termite .... 505-568 



III. T. H. Morgan and Annah Putnam Hazen. 



The Gastrulation of Amphioxus . . . 569-600 



IV. Katharine Foot and Ella Church Stro- 



BELL. 



Photographs of the Egg of Allolobophora 



Foetida 601-618 



GINN & COMPANY, BOSTON, U.S.A. 



