BULIMULUS. 393 



To this variety also are to be referred specimens having delicate longitudinal 

 light wax-colored patches. (Fig. 279.) 

 Animal not observed. 



Bulimulus dealbatus, SAY. 

 Vol. m. PI. LI. Fig. 1 ; Fig. LI. a, except upper and lower Figs. 



Shell umbilicated, ovate-conical, or rather ventricose, thin, white, with longi- 

 tudinal lines and blotches of ash ; suture impressed ; whorls 6 to 7, ventricose, 

 acuminate, the last equalling the spire ; aperture oval ; peristome acute, rarely 

 a little thickened within, somewhat reflected at its columellar portion, and 

 partially hiding the umbilicus. Length of axis, 18 mill. ; diameter, 12 mill. 



Helix dealbata, SAY, Journ. Phila. Acad., II. 159 (1821) ; ed. BINNEY, 20. 

 Bulimus dealbatus, POTIEZ & MICHAUD, Galerie, I. 139, PI. XIII. Figs. 3, 4. - 



PHILIPPI, Icon., I. p. 158, PI. II. Fig. 6 (1844). PFEIFFER, Mon. Hel. 



Viv., II. 187 ; in CHEMNITZ, ed. 2, p. 55.- REEVE, Con. Icon., Fig. 455.- 



BINNEV, Terr. Moll., II. 276, PI. LI. Fig. 1 ; PI. LI. a, excepting upper and 



lower Fig. ? W. G. BINNEY, Terr. Moll., IV. 130, PI. LXXX. Figs. 6, 7; 



L. & Fr.-W. Sh., I. 208 (1869). 

 Bulimus confinis, REEVE, Con. Icon., 643 (1850). PFEIFFER, Mon. Hel. Viv., 



III. 341. 



Bulimus liquabilis, REEVE, Con. Icon., 387. 

 Bulimus lactarius, MENKE in PFEIFFER, 1 Mon., II. 187. REEVE, Con. Icon., 



217. GouLD, Terr. Moll., III. 35. 

 Scutalus dealbatus, TRYON, Am. Journ. Conch., III. 173 (1867). 



A species of the Interior and Southern Regions, found from North Caro- 

 lina to Missouri, Arkansas, and Texas, also Henry and Lawrence Counties, 

 Kentucky. Very common in Central Alabama, where immense beds of semi- 

 fossilized shells are found, several feet below the surface. 



This species, when found in Northern Alabama, is about three fourths of an 

 inch in length, is quite thin, almost transparent, with a thin peristome. In 

 more southern localities its size is greater, its shell thicker, its coloring richer, 

 and within the aperture the peritreme is margined with a broad white callus. 

 Under such circumstances it bears considerable resemblance to B. alternatus, 

 but the interior of the aperture never has the dark coloring of that species, nor 

 is the columella furnished with the tooth-like fold. It is especially in Texas 

 that it is found in such perfection. I have no doubt that the specimens figured 

 on PI. LI. a, of the Terrestrial Mollusks came from that State. 



It is this last-descvihc 1 form of the species which has been called Bulimus 

 lactarius. I have seen no authentic specimen, but from Pfeiffer's description 

 (see Terr. Moll., IV. 128), and his reference to all but the lower figure of PI. 

 LI. a (Mon., IV. 476), there remains no doubt of the identity of the two. 



1 Pfeiffer quotes as synonyine the unpublished name of Bulimus Galeottii, NYST. 



