OP CONCHOLOGY. 2tl 



stated by Mr. Lea, except in regard to four species only, and 

 thus those who in future times depend, as they certainly will 

 on the Bibliography, for the synonymy of these species, will 

 be misled into the perpetuation of a wrong. 



We do not agree with Mr. Binney, that typographical errors in 

 the originals should not be corrected, because, in some cases, their 

 correction is difficult or impossible, any more than we would 

 agree that things should all go wrong unless we could make 

 them all go right. We think he ought to have corrected as 

 many of these errors as possible. 



Considering the immense material of these two volumes, we 

 are surprised at the great accuracy of the print. Save in the 

 case above pointed out, the typographical errors are singu- 

 larly few, showing the most careful, painstaking proof-reading: 

 as Mr. Binney states in his preface: "The proof has generally 

 been corrected from the original work, thus avoiding many 

 errors committed in transcribing." Naturalists may obtain 

 this book, free of cost, upon application to the Smithsonian 

 Institution, which has so generously undertaken its publica- 

 tion, as one of its series of works on the Natural History of 

 our country. 



Proceedings of the Academy of Natural Sciences of Philadel- 

 phia. No. 1. — January, February and March, 1865. (Published in 

 April.) 



Synonymy of the Species of Strepomatidse^ a family of Flu- 

 vialile Mollusca inhabiting North Am,erica. Part 4:: BY 

 GEORGE W. TRYON, JR. 



The former papers on this subject were published in the 

 Proceedings of the Academy for 1863 — 64. The present 

 paper completes the series, and contains a revision and correc- 

 tion of the former three, together with an entire group of 57 

 species previously omitted. A synopsis of the new genus 

 Eurycsehn, proposed by Mr. Lea in 1864, is included; it com- 

 prises eight species, formerly considered Goniobases and An- 

 culosse. 



Among the corrections of synonymy are the following, 

 worthy of particular attention: — 



No. 28. P. unciale, Hald.; P. bicostatum, and rigidum, Anth., 

 P. sugillatum, Reeve, and P. oblita, Lea, are all synoiiyms. 



No. 83. P. opaca, Anth.; P. iostoma and nigrostoma, Anth., 

 and P. Tennesseense, Lea, are synonyms. Mr. Anthony's spe- 

 cies were formerly considered Goniobases. 



No. 22 a. G. abbreviata, Anthony. In the synonymy of this 

 species must be included Mr. Anthony's G. elegantula, coro- 

 nilla and chalybsea. 



