J50TMUIK.Mr.KVoN. O 



of variation and the indistinctness of lines of demarkalion between 

 the various nascent species. 



Reeve quotes Bidimus obtusus from Australia, but this is an error 

 for Austria (Conch. Icon, species 583). 



B. DUX (Pfeiffer). PI. 3, fig. 62. 



Shell large, narrowly and partly covered umhilicate, ovate, solid 

 and strong, opaque, pale flesh-tinted. Surface lustreless, sculptured 

 with irregular growth wrinkles, decussated by spiral incised lines on 

 the spire. Spire conic, the apex small, earlier 1J whorls densely 

 and finely pitted, the pits arranged in more or less regular vertical 

 rows. Whorls 6, but slightly convex, the last one large and oblong. 



Aperture ovate, but slightly oblique, the interior, columella and 

 parietal wall of a pale purple tint ; outer lip simple, blunt ; columella 

 broadly reflexed above. 



Alt. 52, diam. 29, longest axis of aperture 3031 mill. 



South coast of Western Australia : King Georye Sound (Masters) ; 

 Israelite Bay (Shackleford) ; 50 miles E. of Israelite Bay (Cox) ; 

 Fraser Range (Elder Exped.). 



Biilimm dux PFR., P. Z. S. 1861, p. 24; Malak. Bl. 1861, p. 15; 

 Monogr. vi, p. 108. Cox, Monogr. Aust. Land Shells, p. 71, pi. 13, 

 f. 4; pi. 18, f. Id. BEDNALL, Trans. Roy. Soc. South Australia, 

 xvi, p. 66 (1892). Buliminus du.r. Plr., SHACKLEFORD, Journ. of 

 Conchology, ix, no. 7, p. 219 (July, 1899). Bulimus (Liparus) 

 dux Pfr., E. A. SMITH, Proc. Malac. Soc. Lond. i, p. 94. 



The largest species of the genus. 



B. INFLATUS (Lamarck). PI. 1, figs. 1-5. 



Shell narrowly umbilieated, of a compact ovate form, rather solid, 

 white under a thin straw-yellow cuticle, unicolored, or with a small 

 brown umbilical patch, and often a brown band below the suture ; 

 sometimes with irregularly spaced brown longitudinal streaks and 

 some buff striae. Surface rather shining, irregularly but not strongly 

 striated longitudinally, obsoletely decussated on the spire, and some- 

 times showing a few faint decussating spirals below the suture of the 

 last whorl. 1^ to 1J| apical whorls low, the first one sculptured 

 with rather coarse oblique wrinkles, more or less anastomosing, and 

 changing on the last half whorl to a subregular and increasingly 

 finer pitted pattern (pi. 4, fig. 72, 73, 74). Spire short, convexly 



