The Onio Journal of Science 



Vol. XXI MARCH, 1921 No. 5 



A PRELIMINARY GENERAL SURVEY OF THE MACRO- 

 FAUNA OF MIRROR LAKE ON THE OHIO 

 STATE UNIVERSITY CAMPUS.*t 



Walter C. Kraatz, 

 Ohio State University. 



CONTENTS. PAGE 



I. Introduction 137 



Acknowledgments 140 



II. Mirror Lake: Description and History 141 



III. Description of Stations ; 141 



IV. Ecology of Mirror Lake 145 



A. The Flora of Mirror Lake 145 



B. Ecology of the Pond as a Whole 146 



C. Ecological "Habitats and Grouping of Stations into Habitats 146 



V. General Systematic Survey of the Macrofatina with Notes on the 



Various "Species 148 



Porif era 148 



Coelenterata 148 



Platyhelminthes 148 



Nemathelminthes 148 



Annelida 149 



Mollusca 151 



Arthropoda 153 



Vei tebrata 174 



Table: Numbers of Specimens of Various Acjuatic Species found at 



Various Stations 178 



Literature cited 181 



Plates 182 



PART I. 



INTRODUCTION. 



The present work was undertaken with the purpose of 

 making as extensive a survey as possible, in the Hmited avail- 

 able time, of the fauna (exclusive of the microscopic part) of a 

 pond on the Ohio State University campus, known as Mirror 

 Lake. Though much general collecting has been done in this 

 pond and an extensive study of the aquatic Hemiptera made 



* Thesis submitted in partial fulfillment of the requirements for the degree 

 of Master of Arts, in the Ohio State University, 1920. 



t Contribution number 63, from the Department of Zoology and Entomology, 

 Ohio State University. . 



137 



