IV. LIST OP CONTRIBUTORS. 



Second Contribution to the Selachology of California ,... 147 



Synopsis of the Pleuronectoids of the eastern coast of North America... 214 



Synopsis of the Cyclopteroids of eastern North America 189 



Notes on the Paralepidoids and Microstomatoids, and on some peculiari- 

 ties of Arctic Ichthyology 187 



Synopsis of the Pleuronectoids of California and North-western America, 194 



Descriptions of new generic types of Pleuronectoids 198 



On the affinities of several doubtful British Fishes 199 



Notes on the Family of Stichseoids 208 



De?criptions of new genera and species of Eastern American Pleuro- 

 nectoids 220 



Helmuth, C. A., M.D. New species of Mordellestina collected in Illinois, 105 



Lawrence, G. N. Descriptions of New Species of Birds of the Families 



Coerebidse, Tanagridse, Icteridse and Scolopacidae 106 



Lea, I. Description of a new Genus of the Family Melanidse 2 



Description of eleven new species of Indigenous Melanidse 3 



Description of Planorbis Newberryi 5 



Descriptions of six new species of Unionidse from Lake Nyassa, Central 



Africa 108 



Descriptions of six new species of Succinea 109 



Descriptions of thirteen new species of Melanidse Ill 



Description of a new species of Pbnorbis Ill 



Descriptions of five new species of Lymnsea 113 



Descriptions of two new species of Unionidse from South Africa 113 



Descriptions of twenty-four new species of Physa of the United State's 



and Canada 114 



New Unionidse, Melanidse, &c, chiefly from the United States 145 



Descriptions of six new Western Asiatic Unionidse 285 



March, W. T. Notes on the Birds of Jamaica. Part III 62 



Stiinpson, Dr. Win. Descriptions of new marine Invertebrata from Pu- 



get's Sound 153 



Tryon, Geo. W., Jr. Synonymy of the species of Strepomatidae. Part 2, 24 

 Part 3 92 



Wincbell, Alex. Description of a Gar-Pike, supposed to be new 183 



Wood, Dr. H. C. Descriptions of new species of North American Poly- 



desinidse 6 



Descriptions of new species of North American Iulidae 10 



Description of new Genera and Species of North American Mvriapoda.. 186 



