BULIMULUS-ORTHOTOMIUM. 133 



ous ; outer lip strongly thickened within, with a light border ; col- 

 umella more or less distinctly folded or even toothed above. Length 

 about 30-35 mill. 



Northeastern Mexico and southern Texas. 



Bulimus alternatus SA^^WN Harmony Disseminator, Dec., 1830, 

 p. 25 (ed. Binney, p. 39). PFR., Monogr. Hel. Viv., ii, p. 221. 

 BINNEY, Terr, air-breath. Moll, of N. Am., IV, p. 126, pi. 80, f. 1, 

 3 (copy of Say's drawing). Thaumastus alternatus TRYON, Am. 

 Journ. Conch., iii, p. 171, pi. 9 (13), fig. 6 ; pi. 10 (14j, fig. 10. 

 Bulimulus alternatus BINNEY & BLAND, Land and Fresh-water 

 Shells of N. Am., i, pp. 200-204, f. 347-350, 351 (radula) ; BINNEY, 

 Terr, air-breath. Moll, of N. Am., v, pp. 388-391 (with the same 

 figures repeated). COCKERELL, Journ. de Conch., xxxix, p. 23 

 (1891). STEARNS, in Proc. U. S. Nat. Mus., xiv, p. 99, (1891). 

 Bulimulus (Thaumastus) alternatus FISCH. & CROSSE, Miss. Scient. 

 Mex., Mollusca, i, p. 561, pi. 24, f. 1 (copy of Say's original draw- 

 ing). BLAND & BINNEY, Am. Journ. Conch., vii, p. 181. Bulimus 

 lactarius (Menke), PFR., Syrnb. Hist. Hel., iii, p. 85 (1846) ; Mon- 

 ogr. Hel. Viv., ii, p. 187. REEVE, Conch. Icon., v, Bulimus, pi. 37, 

 f. 2176. Bulimus (Scutalus) marice ALBERS, Die Helic. ed. 1, pp. 

 160, 162. Bulimus marice PFR., Monogr. Hel. Viv., iii, p. 350; in 

 Martini & Chemnitz, Syst. Conch. Cab., ed. 2, Bulimus, p. 157, pi. 

 48, f. 7, 8 ; P. Z. S., 1858, p. 23, pi. 40, f. 2. Bulimus (Ena) marice 

 PFR. in Mai. Bliitt., xii, p. 154 (1855). Orthalicus (Scutalus) marice 

 H. & A. ADAMS, Gen. Rec. Moll., ii, p. 158. Bulimulus (Thaumastus) 

 marice v. MART., in Albers's Die Hel., ed. 2, p. 215. Thaumastus 

 marice TRYON, Am. Journ. Conch., iii, p. 172, pi. 10 (14), f. 3. 

 Bulimus dealbatus var., BINNEY, Terr, air-breath. Moll, of N. Am., 

 ii, p. 276, pi. 51, 51a (uppermost and lowest figures); pl.51b (the three 

 middle figures). Bulimulus (Rhabdotus] alternates MARTENS, Biol. 

 Cent. Amer., Moll., p. 243, pi. 15, f. 24-26. Bulimus binneyanus 

 (Pfr., ins. label) BINNEY, Terr. Moll., iv, p. 128 (1859). Not B. 

 binneyanus Pfr., Malak. BL, iv, p. 229 (1857). Bulimus cjaleottii 

 NYST, in litt. Bulimulus alternatus STEARNS, Proc. U. S. Nat. 

 Mus., xiv, 1891, p. 99 (includes schiedeanus, patriarcha, marice, 

 mooreanus as synonyms). 



B. dealbatus var. mooreanus has regular striation upon the post- 

 nepionic whorls of the spire or some of them, lacking in alternatus. 

 It is generally less oblong and thinner. B. dealbatus var. schiedeanus 

 is rougher, with the aperture wider and shorter. 



