Volume XVI . August, igoo. Number J. 



JOURNAL 



OF 



MORPHOLOGY. 



THE DEVELOPMENT OF THE COXAL GLAND, 



BRANCHIAL CARTILAGES, AND GENITAL 



DUCTS OF LIMULUS POLYPHEMUS. 



WM. PATTEN AND ANNAH PUTNAM HAZEN. 



CONTENTS. „.^„ 



PAGE 



I. Introduction 460 



II. Methods 460 



III. Critical Review 461 



IV. Formation of Mesoblastic Somites and Blood Sinuses 463 



V. Development of the Genital Ducts 465 



VI. Development of the Branchial Cartilages, Muscles, and 



Nerves 469 



VII. The Nephric Gland 472 



A. Development of the Nephridial Lobes 472 



B. Structure of the Nephric Gland in the Adult 476 



VIII. The Nephric Duct 479 



A. Development of the Nephric Duct 479 



B. The End Sac 482 



C. The Nephric Duct of the Adult 483 



IX. Cells of Doubtful Significance 484 



X. Summary 486 



459 



