PAGES 



iv CONTENTS. 



No. 3. — December, i8g8. 



I. George William Hunter, Jr. 



Notes on the Finer Strnctiire of the Nervous 



System of Cynthia Partita (Verrill) . . 99-115 



II. Ulric Dahlgren. 



TJie Maxil/ary and Mandibular Breathing 



Valves of Teleost Fishes 1 17-124 



III. Florence Peebles. 



TJie Effect of Temperature on the Regener- 

 ation of Hydra 125-128 



IV. Katharine Foot and Ella Church Strobell. 



Further Notes on the Egg of AllolobopJiora 



Foetida 129-150 



No. 4. — February, 1899. 



I. M. A. WiLLCox, Ph.D. 



Notes on the Occipital Region of the Trout, 



Trutta Fario i 51-154 



II. C. H. Turner. 



N'otes on the Mushroom Bodies of the Invei'- 

 tebrates. A Preliminary Paper on the 

 Comparative Study of the Arthropod and 

 Annelid Brain 155-160 



III. Gustav Eisen, Ph.D. 



Notes on N^orth- American Earthivorms of 



the Ge?ius Diplocardia 161-172 



IV. Maurice A. Bigelovv. 



Notes on the First Cleavage of Lepas . . . 173-177 



V. Charles A. Kofoid. 



On the Specif c Identity of Cotylaspis In- 

 signis Leidy and Platyaspis Anodontae 

 Osborn 179-186 



VI. C. E. McClung. 



A Peculiar Nuclear Element in the Male 



Reproductive Cells of Insects . . . . 187-197 



