40 DRYMJEUS, MEXICO AND CENTRAL AMERICA. 



microscopic, close spiral striae more clearly on the base. The main 

 distinction, however, is geographic, serperastrum being an eastern, 

 ziegleri a western form. So far as present information goes, its 

 range is separated from that of serperastrum by the table-land of 

 Mexico. 



The original description of B. ziegleri Pfr., which was drawn from a 

 small or immature specimen, is as follows: Shell subperforate, ovate- 

 conic, thin, closely striatulate, obsoletely decussated with spiral lines, 

 under the lens ; whitish ; spire conic, rather acute. Whorls 6, a 

 trifle convex, the last subangulate in the middle, a little shorter than 

 the spire ; columella a little receding ; aperture oval ; peristome sim- 

 ple, the columellar margin narrowly reflexed, subappressed. Long. 

 21, diam. 10 mill. Aperture 10 mill, long., 6 wide (Pfr., Proc. Zool. 

 Soc. 1846, p. 113). Locality unknown. 



A var. P, with the shell pellucid, buff, encircled by chestnut bands, 

 on the upper whorls interrupted into spots, is also described. This 

 variety is figured by Reeve, Conch. Icon. pi. 58, f. 389. Von Mar- 

 tens refers it to B. emeus Say. Probably it has nothing to do with 

 the typical ziegleri. 



In the Monographia, Pfeiffer gives the localities Central America 

 (Largilliert) and Mexico ? (Liebinann). Pfeiffer furnished to Bin- 

 ney the shell figured as ziegleri in L. and F.-W. Sh. N. A., p. 193, 

 f. 336. Carpenter records it from Mazatlan, as Orthalicus ziegleri 

 (Maz. Catal. p. 177). 



From the series before me, I am disposed to consider the Mazatlan 

 ziegleri as identical with californicus specifically; the description of 

 the latter here follows : 



B. californicus Reeve (pi. 49, fig. 34). "Shell somewhat acumin- 

 ately ovate, rather thin, scarcely umbilicated ; whorls 6 in number, 

 smooth ; columella reflected ; lip simple. Cream color, encircled with 

 interrupted transverse blue-black zones." 



Gulf coast of Lower California (Stearns), or perhaps mainland 

 coast of the Gulf; California (Hartweg, according to Reeve). 



Bulimus californicus REEVE, Conch. Icon. pi. 56, f. 378 (Dec., 



1848). PFR., Monogr. iii, p. 122. BINNEY, Land and F.-W. Sh. 



N. A., i, p. 199, f. 345 Bulimulus (Drymaus) californicus DALL, 

 Proc. U. S. Nat. Mus. xvi, 1893, p. 641 STEARNS, ibid, xvii, 1894, 

 p. 165. 



As stated above, this is apparently the much variegated extreme 



