186 Proceedings of the Biological Society of Washington. 



vided with four strong oblique folds, of which the posterior is the strongest, 

 while the other three decrease in size successively; parietal wall covered 

 with a thin callus except at the posterior angle of the aperture, where 

 it is decidedly thickened. 



The type and another specimen of this species, Cat. No. 219,052, U. S. 

 N. M., Collector's No. 107, were collected by Mr. Weber at Bancalan 

 Island. The type has lost the nuclear tip and probably the first one and 

 a half postnuclear turns. The seven and a half remaining whorls meas- 

 ure: length, 27.2 mm.; greater, 10.9 mm. 



Turricula banca!anensis, new species. 



Shell small, elongate ovate, the spire flesh colored except the narrow 

 dark zone on the suture; in the last whorl the posterior half of the whorl 

 is encircled by a light brown band, the rest of the shell being flesh colored. 

 Nuclear turns one and a half, strongly rounded, smooth, forming a some- 

 what mamillated apex. Postnuclear turns roundly shouldered at the 

 summit, well rounded, marked by strong, broad, slightly protractive 

 axial ribs, of which sixteen occur upon the first to fifth, fourteen upon 

 the sixth, and twelve upon the penultimate turn. These ribs become 

 slightly enfeebled at the summit, and evanesce on reaching the anterior 

 half of the base. In addition to the axial ribs the entire surface of the 

 shell is marked by very fine lines of growth. The spaces between the ribs 

 are a little wider than the ribs and are crossed by three incised pits between 

 the summit and the suture, the space between the summit and the first 

 being the widest, while that between the first and second equals the space 

 between the suture and the third in width, the space between the second 

 and third being a little wider than the last named. Suture strongly marked. 

 Base rather prolonged, slightly concave at the insertion of the columella, 

 the posterior third marked by six incised spiral lines, which are less regularly 

 spaced than those on the spire. The anterior two-thirds of the base is 

 marked by eight irregular, broad, low, rounded spiral cords. Aperture 

 irregularly elongate oval, posterior angle acute, decidedly channeled 

 anteriorly; outer lip thin, somewhat sinuous; inner lip provided with four 

 oblique folds of which the posterior is the strongest, the others becoming 

 successively weaker; parietal wall covered by a thin callus anteriorly, 

 and a much thicker one at the posterior angle of the aperture. 



The type and two immature specimens of this species, Cat. No. 219,053, 

 U. S. M. N., were collected by Mr. Weber at Bancalan Island. The 

 type has 8.5 whorls and measures: length, 10.6 mm.; greater diameter, 

 4 mm. 



Colurnbella deveyrai, new species. 



Shell small, ovate, marked by alternating irregular axial zigzag bands 

 of white and blackish brown, which are of about equal width. Nuclear 

 whorls decollated. Postnuclear whorls strongly rounded, inflated, smooth 

 excepting fine incremental lines. Suture strongly constricted. Periphery 

 of the last whorl inflated. Base rather long, concave in the middle, the 



