BULIMULUS-NAESIOTUS. 117 



1896, p. 439, pi. 17, f. 6, 11 (teeth and jaw). Bulimulus unifasciatus 

 REIBISCH, Isis, 1892, p. 15, syn.; but not p. 32, pi. i, fig. I(=nux 

 var.). 



" In its thin and ample shell, uniform reddish-brown color, and 

 narrow, well-defined peripheral pale band, this form resembles the 

 species of the mainland more than any other Galapagos species. The 

 transverse riblets on the nepionic shell are very fine and almost 

 always decorticated [as in fig. 47 ; but even when perfect they are 

 confined to the crown of the whorl] ; the granular spirals are almost 

 microscopic, and when fresh and perfect, bear small projections of 

 the periostracum ' (Dall~). Fig. 46 is an enlarged view of the 

 sculpture of the last whorl. 



B. SIMROTHI Reibisch. PI. 23, figs. 28, 29, 30. 



Shell umbilicate, ovate-conic, solid ; brown above, becoming very 

 pale on the body-whorl, where two faint, narrow, darker bands de- 

 fine a light peripheral line. Surface lusterless, obliquely striate and 

 with fine, indistinct spirals above, becoming very coarsely and deeply 

 wrinkled and pitted on the body-whorl, which is feebly grooved at 

 the position of the peripheral line. Whorls nearly 6J, convex, the 

 last flattened laterally. 



Aperture pentagonal-oval, brownish inside, peristome white, 

 thickened within, the thickening often irregularly calloused, edged 

 by a smooth band outside. Columella calloused in the middle. 



Alt. 11*5, diam. 6*6, alt. of aperture 5 mill. 



La Tortuga, grassy zone, South Albemarle (Baur) ; 1,000-2,000 

 feet, in the moist region, Albemarle Island (Wolf). 



Bulimulus (Ncesiotes) Simrothi REIBISCH, Isis, 1892, p. 23, t. 2, 

 fig. 2. STEARNS, Proc. U. S. Nat. Mus., XVI, pp. 414, 428, 1893. 

 BALL, Proc. Acad. N. S. Phila., 1896, p. 441, pi. 16, f. 11, 12, 13 ; pi. 

 17, f. 2 (jaw). Bulimulus (Ncesiotus') tortuganus DALL, Nautilus, 

 VII, p. 54, 1893. 



" Herr Reibisch has kindly furnished a photograph of one of his 

 types of B. simrothi with which I have compared my specimens of 

 tortuganus. Wolf's shell in the photograph appears smoother, with- 

 out the deeply indented markings, and exhibits color streaks in 

 harmony with the lines of growth which none of the specimens of 

 tortuganus do. Nevertheless, the two forms should probably be 

 united, especially as Reibisch's description agrees better than the 

 photograph as respects surface and color. As the specimens col- 



