Number 105. January 2, 1922. 



OCCASIONAL PAPERS OF THE MUSEUM OF 

 ZOOLOGY 



UNIVERSITY OF MICHIGAN 



Ann Arbor, Michigan Published by the University 



A LIST OF THE LANCELETS OF THE WORLD WITH 



DIAGNOSES OF FIVE NEW SPECIES OF 



BRANCPIIOSTOMA 



By Care L. Hubbs 



In the present paper there are given the resuhs of a tax- 

 onomic study of the lancelets (Amphioxi) contained in the 

 collections of the United States National Museum, Stanford 

 University, the Field Museum of Natural History, and the 

 Museum of Zoology of the University of Michigan. A fine 

 series from Bermuda has been generously placed at the 

 writer's disposal by Professor W. J. Crozier, now of Rutgers 

 College, 



"The writer has studied critically only those lancelets belong- 

 ing to the genus Branchiostoma. During the course of the 

 examination of the species of this genus he has found a num- 

 ber of characters to be quite as valuable in specific analysis as 

 is the myotome formula, hitherto chiefly relied upon. The 



