CONTENTS 



OT THE 



SEVENTH VOLUME 



BY THOMAS BXAND. 



PA6B 



Remarks on certain species of North American Helicida;. . . 26, 115, 420 

 On the Geographical Distribution of the Genera and Species of Land Shells 

 of the West India Islands, and a Catalogue of the Species of each 

 Island 335 



BY THOMAS BLAND AND J. G. COOPER. 



Notice of Land and Fresh-water Shells, collected by Dr. J. G. Cooper in 



the Rocky Mountains, etc., in 1860 362 



BY ARTHUR EDWARDS. 



Note on the Reproduction of Individuals of the Genus Actinia . . . 19 

 On the Microscopic Forms of the Harbor of Charleston, South Carolina . 103 



BY D. G. ELLIOT. 



Desceiption of a new species of Eupsychortyx 106 



On the Occurrence, within the limits of the United States, of Barrow's 



Golden-Eye, Bucephala Islandica 449 



BY THEODORE GILL. 



Prodromus descriptionis subfamiliae Gobinarum squamis cycloideis pis- 



cium cL W. Stirapsono in Mare Paeifico acquisitorum ... 12 



Prodromus descriptionis familiae Gobioidarum duorum generum novorum 15 



Description of a new species of Pimelodinas from Canada . . . . S9 

 Descriptions of two new species of Terrestrial Grapsoid Crustaceans from 



the West Indies 42 



Description of a New Generic Form of Gobinaj from the Amazon River . 45 

 Analytical Synopsis of the Order Squali ; and Revision of the Nomencla- 

 ture of the Genera Z61* 



BY JOHN W. GREENE, M.D. 



Descriptions of several New Hymenopterous Insects from the Northwest 



Coast of America ,........• 1 1 



Review of the American Bombidse, together with a description of several 

 Species heretofore undescribed, being a Synopsis of the Species of 

 this family of Hymenopterous Insects thus far known to inhabit 

 North America 163 



