CONTENTS. 



Page. 



Development of sponges from dissociated tissue cells. By H. V. Wilson. (Document 



750, issued June 16, (fqii) i 



Fishes from Bering Sea and Kamchatka. By Charles Henry Gilbert and Charles \'ictor 

 Burke. (Document 754, issued May 6, 1912.) , 31 



Sound as a directing influence in the movements of fishes. By G. H. Parker. (Docu- 

 ment 755, issued April 27, 1912) 97 



Studies on the reproduction and artifici.\l propag.'VTion of fresh-water mussels. By 

 George Lefevre ;md Winterton C. Curtis. (Document 756, issued May 10, 1912) 105 



The Bryozoa of the Woods Hole region. By Raymond C. Osbum. (Doctunent 760, issued 

 Jmie 25, 1912) •. ._ 203 



A review of the cephalopods of western North America. By S. Stillman Berry. (Docu- 

 ment 761, issued July 24, 1912) 267 



vSome hydroids of Beaufort, North Carolina. By C. McLean Frascr. (Document 762, issued 

 July 25,1912)  337 



Notes on a new species of flatfish from off the coast of New England. By William 

 C. Kendall. (Document 764, issued August 8, 1912) 389 



General index 39S 



