Remarks on Certain Species of N. A. Helicidce. 129 



The following are measurements of specimens in my cabinet: 

 Diam. maj. 18, min. 15, alt, T mill. Ohio. 

 " " 15 " 13 " 5 " Maryland. 

 " « 14 " 12 " 5 " Lycoming Co., Pa.^ 

 I have recently received from Dr. Ravenel, for examination, 

 a singular specimen, collected by himself on the mountains 

 near Ashville, N. Car., which I can only refer to this species. 

 It has 6 whorls, and measures, — 

 Diam. maj. 20, min. 18, Alt. 9 mill. 



Efielix fi'iaMIis 1¥. G. Binney. 



Synonymy. 



Helix friabilis W. G. Binnetj, Proc. A. N. S. Pliila. p. 187, 1857. 



" Siippl. p. 106, 1859. 



lucuhrata Pfr. Mon. Hel. IV. No. 413, p. 68, 1859. 



I concur with Mr. Binney in the establishment of this species, 

 but by no means with Dr. Pfeiffer in his view that it is the 

 H. lucubrata Say, with the description of which it does not 

 agree. Say mentions that lucubrata is closely allied to his 

 inornata, but H. friabilis is totally distinct both from II. Icevi- 

 gata Paf. and H. inornata By. W. G. Binney 's shell is of uniform 

 color, and the umbilicus is not "much larger" than that of 

 either of the species referred to. The spire is not " much 

 depressed." 



Binney describes the shell as having four whorls, but I have 

 seen no adult with less than five. Specimens from Illinois are 

 very thin, but those collected by Mrs. Say in Indiana, by Moore 

 in Texas, and received by Dr. Newcomb from De "Witt Co. in 

 the latter state, are rather less so. I am indebted to Mr. Henry 

 Yan Nostrand for a large and heavy example, having 5|- 

 whorls, from Helena, Arkansas, the measurements of which are 

 as foUows : — 



Diam. maj. 31, min. 27, Alt. 16 mill. Ap. 18 mill, longa, 

 15 lata. 



