UNIVERSITY OF CALIFORNIA PUBLICATIONS 



IN 



ZOOLOGY 



Vol. 8, No. 3, pp. 21-186, plates 1-8 December 27, 191 1 



CLASSIFICATION AND VERTICAL DISTRI- 

 BUTION OF THE CHAETOGNATHA 

 OF THE SAN DIEGO REGION 



INCLUDING REDESCRIPTIONS OF SOME DOUBTFUL 

 SPECIES OF THE GROUP 



BY 



ELLIS L. MICHAEL 

 (Contribution from the Laboratory of the Marine Biological Association of San Diego) 



CONTENTS 



PAGE 



Introduction 22 



Part 1. Systematic 26 



Key to the Genera of Chaetognatha 26 



Key to the Species of Sagitta 26 



Key to the Species of Eukrohnia 27 



Key to the Species of Spadella 27 



Descriptions of the San Diego Species of Chaetognatha 28 



Tabulation and Discussion concerning the Ovaries in some of the 



San Diego Species 55 



Eedescriptions of Some Doubtful Species 64 



S. hispida Conant 64 



S. elegans Verrill 69 



«S'. tenuis Conant 72 



Brief Description of Species not yet taken from the San Diego 



Eegion 73 



Part 2. Distribution 77 



Explanation of the Tables of Distribution 77 



Method of Counting 77 



Tables of Surface Hauls 79 



Tables of Horizontal Closing Net Hauls 86 



Tables of Vertical Closing Net Hauls 92 



Table of Open Vertical Net Hauls 96 



