CONTENTS. 



PAGE. 



Meyer, Otto. Action of Hydrofluoric Acid on a Sphere of Quartz. . . .121 



Sharp, Benjamin, M. D. Remarl^s on the Phylogeny of the Lamellibranchiata. 

 Leidy, Joseph, M. D. Habit of Circolana concharum. ..... 



Leidy, Joseph, M. D. Parasites of the Striped Bass. .... ^.j 



Leidy, Joseph, M. D. Trematodes of the Muskrat. .... . 126 



Leidy, Joseph, M. D. Entozoa of the Terrapin. ....... 127 



FlEl.DE, Adele M. Notes on an Aquatic Insect, or Insect Larva, having jointed dor- 

 sal appendages (Plate VIII.) 129 



RiNGUEBERG, EuGENE N. S. Somc ncw species of fossils from the Niagara Shales of 



Western New York, (Plate VII.) 131 



Leidy, Joseph, M. D. A Crustacean Parasite of the Red Snapper. . . . 138 



KOENIG, George A. Note on Eleonorite from Sevier Co., Arkansas. . . . 139 



Kelly, Edwin A. Notes on the Myology of Ursus maritimus. .... 141 



Chapman, Henry C, M. D. & Albert P. Brubaker, M. D. Researches upon 



the general Physiology of Nerve and Muscle. No. 2. ..... 155 



Leidy, Joseph, M. D. Distinctive Characters of Odontaspis littoralis. . . . 162 



Leidy, Joseph, M. D. Parasitic Crustacea. ........ 165 



Leidy, Joseph, M. D. Parasites of the Rock Fish. ...... 166 



Leidy, Joseph, M. D. Louse of the Pelican. ....... 167 



Leidy, Joseph, M. D. Parasites of the Pickerel. ....... 169 



Meyer, Dr. Otto. Upper Tertiary Invertebrates from the west side of Chesapeake 



Bay. 170 



McCook, Rev. Hen"ry C. Notes on the Relations of Structure and Function to 



Color Changes in Spiders. .......... 172 



Fielde, Adele M. On an Insect-Larva Habitation. 176 



Jordan, David Starr. Description of a new species of Etheostoma (E. longimana) 



from James River, Virginia. . . . . . . . . . .179 



Jordan, David Starr. On the generic name of the Tunnv. .... ISO 



OcHSENius, Dr. Carl. On the Formation of Rock-Salt Beds and Mother-liquor 



Salts 181 



Ford, John. Description of a new species of Ocinebra. ..... 188 



Chapman, Henry C, M. D. Observations on the female Generative Apparatus of 



Hyjena crocuta, (Plates IX, X, XL) 189 



KoENiG, Geo. A. Note on Mazapilite, a new species. 192 



McCook, Rev. Henry C. Descriptive Notes on New American Species of Orb- 

 Weaving Spiders. ............ 193 



McCook, Rev. Henry C. A new fossil Spider, Eoatypus Woodwardii. . . 200 



McCook, Rev. Henry C. Nesting Habits of the American Purseweb Spider. . 203 

 Keyes, Charles R. On the Fauna of the Lower Coal Measures of Central Iowa, 



(Plate XII.) 222 



Keyes, Chakles R. Descriptions of two new Fossils from the Devonian of Iowa, 



(Plate XII.) 247 



Hartman, W. D., M. D. New Species of Shells from the New Hebrides and 



Sandwich Islands, (Plate XIII.) 250 



Allen, Harrison, M. D. The Palatal Rugse in Man. 254 



