CONTENTS. 



Page 



I. The Germinal Spot in Echinoderm Eggs. By H. E. Jordan 1-12 



II. Spermatogenesis of Aplopus mayeri. By H. E. Jordan 13-36 



III. The Relation of the Nucleolus to the Chromosomes in the Primary Oocyte 



of Asterias forbesii. By H. E. Jordan 37~7 2 



IV. The Pelagic Tunicata of the Gulf Stream. By W. K. Brooks 73-94 



Part II. Salpa Floridana (Apstein). 



Part III. The Subgenus Cyclosalpa. 



Part IV. On Oikopleura tortugensis, n. sp. A new Appendicularian 



from the Tortugas, with notes on its embryology. 

 V. The Origin of the Lung of Ampullaria. By W. K. Brooks and Bartjis 



McGlone 95-104 



VI. The Annual Breeding-Swarm of the Atlantic Palolo. By Alfred G. 



Mayer 105-1 12 



VII. Rhythmical Pulsation in Scyphomedusas. By Alfred G. Mayer 113-131 



VIII. Notes on Medusae of the Western Atlantic. By H. F. Perkins 133-156 



IX. Helminth Fauna of the Dry Tortugas. By Edwin Linton 157-190 



X. A Variety of Anisonema vitrea. By C. H. Edmondson 191 



