400 



A ^[ANUAI- OF AMERICAN LAND SHELLS. 



Bulinnis Schiedeavus, Pfeiffer, Symb. ad Hel. Hist., i, 43; Mon. Hel. Viv.,* li, 187; 

 in Chemnitz, ed. 2, No. 216, pi. xlvi, figs. 3,4 (1854). — Philippi, Icon.,i, 3, 

 p. 5(), pi. i, fig. 12 (1843).— Keeve, Con. Icon., No. 3(il.— W. G. BiXNEY.Terr. 

 Moll., iv, 129; L. & Fr.-W. Sh., i, 204 (18(59). 



Bnlhnus allij-naliis, Binney, Terr. Moll., pi. li, fig. 2. — Not of Say. 



Thaumafifus Sr]iicdianus,Ti:YO'S, Am. Jonrn. Conch., iii, 172 (1867). 



BitUrnulits Sdiiedeaniii^, W. G. Binney, Terr. Moll., v, 391. 



Texas and the neighboring part of Mexico. Very common in Wash- 

 ington Connty, Texas. 



From Bvlimulus alfernatus this species is distinguished by a rougher 

 surface, a lightcolorcd aperture, a shorter and more pyramidal spire, 

 and by the want of the highly developed tooth-like fold upon the colu- 

 mella. It is of a dead-white color, not variegated with brown blotches. 

 The aperture is shorter and wider, and there is no strong internal white 

 thicliening to the peritreme. Like all the species of the group it has 

 a highly i)olished, very light waxen ai)ex. There are sometimes light, 

 delicate waxen vitta^ upon the first two whorls. 



No description of this species was given by Dr. Binney, nor was it 

 figured, unless in Terr. Moll., Ill, Plate LI, Fig. 2, as B. dealbatus, var. 

 On p. 278 of Vol. II, Dr. Gould erroneously refers to it Plate LI, h. 



There is a great difference in the comparative globoseness of the vari- 

 ous specimens. 



The shell figured as a variety of B. ScMedeanns, with a dark-colored 

 aperture, in the fourth volume of the Terrestrial Mollusks (Plate LXXX, 

 Fig. 15) is rather a specimen of Bui. alternatus, in which the columellar 

 fold is not as strongly developed as usual. Fig. 8 of the same plate I 

 describe below as variety Mooreanus. 



Lingual membrane as in dealbatus. Jaw with 13 ribs. 



Var. Mooreanus. 



Shell perforated, ovate-conic, thin, white, with a dark lead-colored 

 apex, and below the middle of the body-whorl 

 of a light coflfee-color; smooth, with microscopic 

 revolving lines; whorls 7, convex, the last equal- 

 ing about two-thirds the shell's length; aper- 

 ture ovate, light within; columella straight;" 

 l>eiistoine acute, very thin, with an internal deli- 

 cate white rim, its margins unconnected with 



callus, tiiat of tiie columella broad, white, slightly rellected. Length, 



25'"'"; breadth, 12'"'". 



* Pfeiffer qnotes also as synonymes the raannscript names B. xantliosfotnm, Wiegm., 

 and B. candidissimui, Nyst. 



Fig. 438. 



Jl. Mixircaniis. 



