*** No copies of this work will be issued with uncolored plates, 

 or with duplicate plates, colored and uncolored. 



Communications may be addressed to the author, at Marietta or 

 Columbia, Pennsylvania. 



No. 8 will be devoted to the genera Ampullaria and Amnicola. 



Nos. 3, 4, 5, 6, 7, completing the Physad^, may now be bound in 

 a volume, in the order indicated by the signatures. 



On pp. 33, 41, 49, genus Limnea, read signature J, instead of K. 



"Amnicola tenuipes. Shell subumbilicated, lips continuous, ob- 

 long-ovate, thin, smooth, suture slightly impressed, aperture ovate, 

 oblong, angulated above, rounded at base, IJ lines long. Hab. 

 Hopeton, Georgia." — J. H. Couper. 



Melania substricta. Brown, lengthened conical, upper whirls 

 flattened, with numerous folds; body whirl slightly convex, suture 

 impressed, aperture pyriform, purple, obtusely rounded before, f 

 inch. 1. Hab. Tennessee. — Mr. Anthony. Bears some resemblance 

 to M. decora, Lea. I formerly proposed the name substricta for M. 

 conica, Say, supposing the name to have been previously applied to 

 the M. conica. Gray. A subsequent examination of the dates has 

 satisfied me that Say's name has priority, so that Mr. Gray's species 

 now requires a new name, unless the citation of the author presents 

 a sufficient distinction. Melania pilula, Lea, ig identical with An- 

 culosa littorina, Hald. 



n^.j 



