No. 4. — A Fourth Supplement to the Fifth Volume of the Terres- 
trial Air-Breathing Mollusks of the United States and Adjacent 
Territories. By W. Q. Binney.l 
Tun following pages are believed to contain all that has been added 
to our knowledge of the subject prior to date. 
Students are requested to note that in the Third Supplement, p. 214, 
the figures of Arionta Diabloensis and Bridgesi ave reversed, On p. 225, 
Explanation of Plate VII., the references E and F are reversed: on 
p. 226, Explanation of Plate XI., Figures D and G are reversed. 
BURLINGTON, New JERSEY, July 1, 1891. 
Glandina decussata, Desu. 
Plate I. Fig 4. 
Under the name of decussata, specimens are found in most collections which 
I have figured one of them, and its 
| figured in my Third Supplement. 
Should it prove 
can hardly be referred to that species. 
dentition has already been described anc 
The shell is readily recognized by its more cylindrical form. 
distinct from decussata, I would suggest for it the specific name of Singleyana. 
I received it from Bexar County, Texas, collected by Mr. Wetherby. 
Selenites Vancouverensis, Lea, var Keepi, HEMPHILL. 
Plate II. Fig. 5. 
Shell umbilicated, greatly depressed, thin, smooth, shining, transparent, scarcely 
marked by the delicate wrinkles; very light horn-color; whorls over four, some- 
what flattened above and beneath, and scarcely descending at the aperture ; spire 
1 The Terrestrial Air-Breathing Mollusks of the United States and the Adjacent 
Territories of North America, described and illustrated by Amos Binney. Edited 
by A, A. Gould. Boston, Little and Brown, Vols. I., II., 1851; Vol. III., 1857. 
Vol. IV., by W. G. Binney, New York, B. Westermann, 1859 (from Boston Journ. 
Nat. Hist.). Vol. V., forming Bull. Mus. Comp. Zoöl., Vol. IV., 1878. Supplement 
to same, in same, Vol. IX. No. 8, 1888. Second Supplement, in same, Vol. XIII. 
No. 2, 1886. Third Supplement, in same, Vol. XIX. No. 4, May, 1890. 
VOL. XXIL — NO. 4. 
