202 AMERICAN JOURNAL 



much interest. The resemblance of the young Terebrahdina (at 

 the stage represented by fig. 3, PL 1) to Lingtda, is remarka- 

 ble. The subject appears to have been well studied. 



Morjograpb of the Fresh-water Univalve Mollusca of the United 

 Stales. By S. S. Haldemsn. No. 9. With a colored plate of Paludina 

 magnifica and portrait of the author. Phila. Conch. Section of Academy 

 of Nat. Sciences, 1871. 



This important work of Prof. Haldeman, -which was discon- 

 tinued twenty-five vears ago, is now completed in accordance 

 with the author's original plan. The No. embraces title page 

 and preface to the entire work, index and contents ; and the 

 completion of the text, including the description and figure of 

 Paludina magnified. 



P. bimonilifera, Lea, is made a synonym, its date of publica- 

 tion being assumed to be Sept., 1834, because Mr. Conrad has 

 given that date to species of Unionidse, published by Mr. Lea 

 in the same paper that contains the description of his Paludina. 

 jjn my "Continuation," noticed below, I have given priority to 

 Dr. Lea's name, (in accordance with the report of a committee 

 appointed to investigate the subject, printed in this Journal,. 

 Vol. V, p. 3, 1869.) 



Monograph of the Fresh-water Univalve Mollusca of the United 

 States. (In continuation of Prof. Haldeman's work.) By Geo. W. Tryon, 

 Jr. Parts 1, '1, 3. Philada. Oonchological Section Acad. Nat. Sciences, 

 1671. 



The above work, issued simultaneously with a republication,. 

 in Numbers, of Prof. Haldeman's book, contains all the species 

 described during the period of 25 years intervening between the 

 close of the latter and the present time, together with remarks 

 on the older species and a full synonymy. 



The parts enumerated above include the Turbidue, Physa and 

 Limnea, and are illustrated by 13 colored plates. 



Preliminary Report cf the United States Geological Survey of 

 Wyoming, etc. By F. V. Hayden, U. S. Geologist. 8yo. Washington, 

 1871. 



This valuable work contains two papers of interest to conchol- 

 ogists and paleontologists, namely: 



" Preliminary Paleontological Report, consisting of lists 

 of Fossils, with descriptions of some new types." By 

 F. B. Meek. 



" Report on Mollusca." By S. R. Roberts. 



