CONTENTS. 



ARTICLE in. Contributions to the Natural History of the Fresh Water Fishes op 

 North America. By Charles Girard. — I. A Monograph of the Cottoids. 

 Pp. 80, and three plates. 

 Chapter I. On the Fresh Water Cottoids in General 

 Chapter II. Anatomical Observations 

 Chapter III. On the genus Cottus, Artedi 

 Chapter IV. On the genus Cottopsis, Girard 

 Chapter V. On the genus Triglopsis, Girard 

 Diagnosis of Genera and Species 

 Bibliography 

 Explanation of Plates 

 Alphabetic Order of Names 

 Contents 



5 

 14 



3.3 

 62 

 65 

 69 



72 

 75 

 77 

 79 



ARTICLE IV. Nereis Bokeali-Americana, or Contributions to a History op the Marine 



Alg^ of North America. By William Henry Harvey, M.Ii, 



M.R.I. A. — Parti. Melanospermese. Pp. 152, and twelve 



Introduction 



Structure of Algsa 



Movements " 



Habitat . 



Geographical Distribution 



Collecting specimens. 



Uses of the Algse 

 Order I. Fucaceae 

 Order II. Sporochnacese 

 Order III. Laminariacese 

 Order IV. Dictyotacese 

 Order V. Chordariacese 

 Order VI. Ectocarpacese 



Alphabetic Index of Names 



References to the Plates . 



1 

 1 



14 

 17 



20 



28 



31 



49 



73 



80 



99 



121 



132 



145 



150 



ARTICLE V. PLANTiE Wrightian^ Texano-Neo-Mexican^. By Dr. Asa Gray, M. D. — 

 Part I. Pp. 146, and ten plates. 

 Alphabetic Index of Names ...... 



Explanation of Plates ....... 



131 

 143 



ARTICLE VI. The Law op Deposit of the Flood Tide : its Dynamical Action and Of- 

 fice. By Charles Henry Davis, Lieut. U. S. Navy. Pp. 14. 



ARTICLE VII. Description of Ancient Works in Ohio. By Charles Whittlesey. Pp. 

 20, and seven plates. 

 Introductory Remarks ....... 5 



Ancient Excavation, Big Bottom, Pike County .... 7 



Ancient Work near Todd's Fork, Warren County .... ,8 



