CONTENTS. 



Page 

 No. 1. — Descriptions of New and Little-known Medusa from the Western 

 Atlantic. By Alfred Goldsborough Mayer. (6 Plates.) June, 1900 1 



No. 2. — Some MEDUSiE from the Tortugas, 'Florida. By Alfred Golds- 

 borough Mayer. (44 Plates.) July, 1900 11 



No. 3. — Contributions from the Zoological Laboratory of the Museum of 

 Comparative Zoology at Harvard College, under the direction of E. L. 

 Mark. No. 126. The Regenerating Nervous System of Lumbricid.*; 

 and the Centrosome of its Nerve Cells. By Herbert W. Rand. (8 Plates.) 

 September, 1901 83 



