386 Scientific Intelligence. [Nov. 



6. Notice of the late Dr. Waterhouse. 



7. Characters of anew Genus, and Descriptions of three new 

 Species upon which it is formed ; discovered in the Atlantic 

 Ocean, in the Months of March and April, 1816; lat. 22° 9'. 

 By C. A. Le Sueur. 



8. Description of three new Species of the Genus Raja. By 

 C. A. Le Sueur. 



9. Some Account of the Insect known by the Name of 

 Hessian Fly, and of a parasitic Insect that feeds on it. By 

 Thomas Say. 



10. On a new Genus of the Crustacea, and the Species on 

 which it is established. By Thomas Say. 



1 1 . An Account of an American Species of the Genus Tanta- 

 lus, or Ibis. By George Ord. 



12. An Account of the Crustacea of the United States. By 

 Thomas Say. 



13. A short Description of live (supposed) new Species of the 

 Genus Muraena, discovered by Mr. Le Sueur in the Year 1816. 

 By C. A. Le Sueur. 



14. Description of two new Species of the Genus Gadus. By 

 Mr. Le Sueur. 



15. Description of a new Species of the Genus Cyprinus. By 

 Mr. Le Sueur. 



16. An Account of an American Species of Tortoise, not 

 noticed in the Systems. By C. A. Le Sueur. 



17. A new Genus of Fishes of the Order Abdominales, pro- 

 posed, under the Name of Catastomus ; and the Characters of 

 this Genus, with those of its Species, indicated. By C. A. 

 Le Seur. 



18. An Account of two new Genera of Plants, and of a 

 Species of Tillaea and Limosella, recently discovered on the 

 Banks of the Delaware, in the Vicinity of Philadelphia. By 

 Thomas Nutall. 



19. Description of new Species of Land and Fresh Water 

 Shells of the United States. By Thomas Say. 



20. Descriptions of four new Species, and two Varieties, of 

 the Genus Hydrargira. By C. A. Le Sueur. 



21. Observations on the Geology of the West India Islands,, 

 from Barbadoes to Santa Cruz, inclusive. By William Maclure. 



22. Observations on several Species of the Genu* Actinia •> 

 illustrated by Figures. By C. A. Le Sueur. 



23. Description of Collinsia, a new Genus of Plants. By 

 Thomas Nutall. 



24. Act of Incorporation; Constitution of the Society; 

 Library ; Donors to ditto ;. Donations to Museum ; Apparatus. 



II. Common Magnesia Alba of the Shops. 

 Berzelius informs us that he has ascertained the common 

 magnesia alba of the shops to be a compound of three atoms of 



