Notices respecting New Books. 463 



to the Genus Ovis. By G. Ord. — Description of seven Species 

 of American Fresh-water and Land Shells, not noticed in the 

 Systems. By Thomas Say. — Descriptions of several new Species 

 of North American Insects. By Thomas Say. — Observations on 

 the Genus Eriogonum, and the Natural Order Polygone.e of 

 Jussieu. By Thomas Nuttall — Notice of the late Dr. Water- 

 house. — Characters of a new 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^ {)'. 

 By C. A. Le Sueur. — Description of three new Species of the 

 Genus Raja. By C. A. Le Sueur. — Some Account of the In- 

 sect known by the name of Hessian Fly, and of a parasitic Insect 

 that feeds on it. Bv Thomas Say. — On a new Genus of the 

 Crustacea, and the Species in which it is established. By 

 Thomas Say. — An Account of an American Species of the Genus 

 Tantalus or Iris. — By George Ord. — An Account of the Cru- 

 stacea of the United States. By Thomas Say. — A short De- 

 scription of five (supposed) new Species of the Genus MuRiEiVA, 

 discovered by Mr. Le Sueur in the year 1816. By C. A. Le 

 Sueur. — Description of two new Species of the Genus Gadus. 

 By the same. — Description of a new Species of the Genus Cv- 

 PRINUS. By the same. — An Account of an American Species of 

 Tortoish, not noticed in the Systems. By the same. — A new 

 Genus of Fishes, of the Order Abdominales , proposed under the 

 name Catostomus, and the characters of this Genus, with those 

 of its Species, indicated. By the same. — An Account of two 

 new Genera of Plants ; and of a Species of Till.^a, and another 

 of LiMOSELLA, recently discovered on the banks of the Delaware, 

 in the vicinity of Philadelphia. By Thomas Nuttall. — Descrip- 

 tions of new Species of Land and Fresh-water Shells of the 

 United States. By Thomas Say. — Descriptions of four new 

 Species, and two Varieties, of the Genus Hydrargira. By C. A. 

 Le Sueur. — Observations on the Geology of the West India 

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

 Maclure. — Observations on several Species of the Genus Actinia ; 

 illustrated by figures. By C. A. Le Sueur. — Description of 

 Cor.LiNSiA, a new Genus of Plants. By Thomas Nuttall. ' 



The manner in which these papers have been given to the 

 world, is particularly deserving of praise. More desirous of do- 

 ing extensive good than of giving splendid embellishment to 

 their own merits, the Academy have not only published their 

 Transactions in a very cheap form, but in progressive numbers, 

 each consisting of two, three, or more sheets, according as there 

 may be quantity of matter ready for publication at the time. 



Jui>t 



