102 BULIMULUS-NAESIOTUS. 



is needed to establish this beyond controversy, but at present there 

 seems no escape from this conclusion " (Da//). 



Form incrassatus (Pfr.). PL 16, figs. 42, 43, 44, 45. 



The form described as B. incrassatus is quite solid, sculptured 

 with rather strong oblique folds, which are yellow on a deep chest- 

 nut ground ; incised spirals few ; apex purple-black. 



Var. verrucosus (Pfr.). PL 16, fig. 39. 



Shell openly and compressed umbilicate, ovate-conic, solid, sculp- 

 tured with somewhat interrupted folds and oblong warts ; brown 

 variegated with paler. Spire conic, rather acute, sutures subcanali- 

 culate. Whorls 7, rather flat, the last about three-sevenths the total 

 alt., rounded at base. Aperture subvertical, truncate-oval, sub- 

 angular at columella, livid inside ; peristome straight, brown-bor- 

 dered inside, the columellar margin dilated, spreading. Columella 

 lightly folded. Alt. 23, diam. Ill, alt. aperture 11 mill. (Pfr.). 



JBulimus verrucosus PFR., P. Z. S., 1885, p. 116 (Gal. Is.) ; Mon. 

 Hel. Yiv, IV, p. 475, 1859. Bulimus (Ncesiotus) verrucosus PFR., 

 Mai. Blatt., ii, Vers., p. 161, 1854. Bulimulus (Ncesiotus) verruco- 

 sus PFR., Norn. Hel. Viv, p. 254, 1881 . REIBISCH, Isis, 1892, p. 15. 

 Bulimulus asperatus RETBISCH (non Pfr.), Isis, 1892, pi. 1, fig. 3 

 (syn. excl.). B. nux var. verrucosus Pfr., DALL, /. c. 



Var. asperatus (Albers). PL 16, figs. 40, 41. 



Shell deeply rimate-umbilicate, ovate-pyramidal, solid, irregu- 

 larly warty from spiral sulci and longitudinal wrinkles ; buff whitish 

 under a deciduous cuticle. Spire conic, the apex acute; suture 

 crispate, subexcavated. Whorls 7, slightly convex, the embryonal 

 smooth, the last about as long as the spire, compressed at base. 

 Aperture vertical, oblong, angular at base, white inside ; peristome 

 simple, acute, the margins parallel, joined by a thin callus ; colum- 

 ellar margin much dilated, vaultingly spreading. Columella 

 straightened, descending to the base of the aperture. 



Alt. 24, diam. 11 J ; alt. of aperture 12 mill. (Pfr.). 



Bulimus asperatus ALBERS, Malak. Blatt., IV, p. 98, 1857. 

 PFR., Mon. Hel. Viv, IV, p. 475, 1859 ; VI, p. 121 ; Novit. Conch., 

 IV, p. 145, pi. 133, figs. 8, 9. Bulimulus (Nesiotus) asperatus MAR- 

 TENS in Albers Heliceen, ed. ii, p. 220, 1860. Bulimulus (Ncesio- 

 tus~) asperatus PFR., Nom. Hel. Viv, p. 254, 1881 ; not of Reibisch, 

 Isis, 1892, pi. 1, fig. 3, verrucosus var. Bulimulus invalidus REI- 

 BISCH, Isis, 1892, p. 17, t. 1, fig. 6. 



