BULIMULUS-NAESIOTUS. 103 



B. RUGULOSUS (Sowerby). PI. 16, figs. 46, 47. 



Shell rimate, oblong turrited, longitudinally wrinkled, granulated 

 by elevated concentric lines. Brown, with two rufous girdles ; 

 whorls 8, convex, the last over a third the total length of shell, com- 

 pressed laterally. 



Aperture oblong ; peristome simple, a trifle expanded, the mar- 

 gins subparallel, joined by a callus, the right margin lightly arcuate 

 above, columellar margin dilated, vaulted and spreading. Alt. 21, 

 diarn. 8, alt. of aperture 8 mill. (Pfr.). 



Galapagos Is. : Under stones near the shore, Blackbeacli Road, 

 Charles Island (Dr. Baur) ; diaries Island (Darwin and Wolf) ; 

 Chatham Island (Darwin, Kellett and Cuming). 



Bulinus rugulosus SBY., Conch. 111. Part 142, fig. 87 (a, b), 1839. 

 Bulimus rugulosus PFR., Mon. Hel. Viv., II, p. 113, 1848. Bul- 

 imus eschariferus REEVE, Conch. Icon., pi. xx, no. 121, (text, figure 

 excluded), 1848, not of Sowerby. Bulimulus (Omphalostyla) rugu- 

 losus H. & A. ADAMS, Gen. Rec. Moll., II, p. 161, 1855. Bulimulus 

 (Nwsiotus) rugulosus PFR., Nom. Hel. Viv, p. 254, 1881. ANCEY, 

 Bull. Soc. Mai. France, IV, p. 294, 1887, (Chatham Island). 

 STEARNS, Proc. U. S. Nat. Mus., xvi, pp. 381, 426, 1893. DALL, 

 Proc. Acad. N. S. Phila., 1896, p. 431, pi. 17, f. 1 (jaw). B. rug- 

 ulosus var. infuscata ANCEY, op. cit., p. 294, 1887. Not B. rugulosus 

 REIBISCH, Isis, 1892, p. 19, pi. 1, figs. 11 SL-b,=B.perspectivus Pfr. 



Decidedly narrower than B. nux. Dall writes: "Jaw thin, 

 membranaceous, light horn-colored, low, wide, arcuate, of equal 

 height throughout, ending bluntly ; anterior surface with about 20 

 broad, flat ribs, their outer edges reinforced, the margins of the jaw 

 squarely denticulated by the projecting ends of the ribs. 



" Some varieties of B. nux approach this species quite closely, espe- 

 cially that to which Reibisch gave the name ofinvalidus" 



In var. infuscatus Ancey, the bands spread, forming the ground- 

 color of the shell, leaving only a narrow lighter zone between them. 



Var. nudus Reibisch. PI. 22, fig. 1. 



Shell long-conic, fusiform, perforate, rather solid, irregularly pli- 

 cate or ribbed, with one white band ; spire acute; suture moderate, 

 nodulous. Whorls 8i, convex, equally increasing, the nucleus 

 smooth (?). Aperture a little oblique, semioval ; peristome simple, 

 the margins joined by a thin callus, right margin angularly adnate 



