BULIMULUS-NAESIOTUS. 105 



yellow with two interrupted dark brown bands ; rather shining ; 

 sculpture of very irregularly spaced, obliquely longitudinal yellow 

 folds, showing decussating spirals above, but only obscurely on the 

 last whorl. Spire long conic, the apex obtuse, nearly 2 earlier 

 whorls forming the costellate nepionic shell. Whorls 6, convex, 

 the last rounded. 



Aperture contained 21 times in length of the shell, whitish within 

 with a brown margin toward the lip-edge ; peristome acute, outer lip 

 strongly arcuate above, columellar lip dilated above, white ; col- 

 umella short, vertical. 



Alt. 13f, diam. 7, alt. of aperture 5 mill. 



Charles Island (Cuming). 



Bulinus ustulatus SBY., P. Z. S., 1833, p. 72, (Charles Island); 

 onch. 111., p. 6, fig. 42, 1833. Bulimus ustulatus DESH. in Lam. 

 An. s. Vert., ed. II, vol. viii, p. 279, 1838. PFR., Mon. Hel. Viv., 

 II, p. 217, 1848 ; in Chemn. Conch. Cab. ed. II, Bulimus, t. 62 ; figs. 

 16-18. REEVE, Conch. Icon., pi. xxi, fig. 130, 1848. Buliminus 

 ustulatus BECK, Ind. Moll., p. 70, 1838. Bulimulus (Omphalostyla') 

 ustulatus H. & A. AD., Gen. Rec. Moll., II, p. 161, 1855. Bulimus 

 (Ncesiotux') ustulatus ALBERS, Heliceen, p. 162, 1850. Bulimulus 

 (Nesiotes) ustulatus MARTENS in Albers, ed. ii, p. 221, 1860. Bui- 

 imulus (Ucesiotus) ustulatus PFR., Nom. Hel. Viv., p. 254, 1881. 

 STEARNS, Proc. U. S. Nat. Mus., xvi, p. 427, 1893. DALL, Proc. 

 Acad. Nat. Sci. Phila., 1896, p. 432. Bulimulus (Ncesiotus') venustus 

 REIBISCH, Isis, 1892, p. 17, t. i, fig. 7. ? B. ustulatus Reibisch, Isis, 

 1892, p. 16, t. i, fig. 5,=nux var. ? 



This species is notable for the yellowness of its paler parts and the 

 bright sienna brown of its darker portions. It is closely related to 

 B. calvus Sby., which is a smaller, narrower shell. The form figured 

 by Reeve (pi. 16, fig. 52) and by Reibisch (pi. 16, fig. 51) under 

 this name is somewhat larger than the true ustulatus, and is con- 

 sidered by Dr. Stearns to be a banded variety of B. nux, but this is 

 very doubtful. PI. 16, fig. 49 is a copy of Sowerby's original figure. 

 PI. 23, fig. 16 is an enlarged view of a more streaked form. 



B. venustus Reibisch (pi. 16, fig. 50) does not seem to offer any 

 differential characters, and is placed here by Dall. 



B. CALVUS (Sowerby). PI. 22, figs. 2, 3, 4, 5. 



Shell rimate umbilicate, oblong- turrited, solid ; chestnut with few 

 darker, obliquely longitudinal bands. Surface somewhat shining, 



