2 PROCEEDINGS OF THE NATIONAL, MUSEUM vol. 79 



rounded, marked by the continuation of the axial ribs, which extend 

 to the columella and five equal and equally spaced incised spiral 

 lines, which equal those of the spire in strength but are a little more 

 closely spaced than those. The ribs here as on the spire are ren- 

 dered weakly tuberculated by the incised spiral lines. Columella 

 about as long as the base, very stout, marked by seven equal strongly 

 incised spiral lines, which make the spaces between them appear as 

 equal, low cords. Aperture irregularly lunate, decidedly channeled 

 anteriorly and slightly so posteriorly. Outer lip decidedly thickened 

 immediately behind the edge, bearing eight teeth on the inside. The 

 jjosterior of these teeth is more than double the width of the next 

 three, which are subequal. The four anterior teeth are crowded 

 on the basal fourth of the outer lip ; they are also of equal size, and 

 less than one-fourth the size of those posterior to them. The inner 

 lip is reflected as a thick callus over the columella. The parietal 

 wall on its anterior half is covered with a thin callus, while on its 

 posterior half it bears a thick lumplike callus, which joins it to the 

 outer lip at the posterior angle of the aperture. 



jypg.—U.S.N.M. No. 368143, collected by C. D. AUeman on 

 Taboga Island, Panama. It has almost eight whorls, and measures : 

 Length, 7 mm.; diameter, 3.3 mm. U.S.N.M. No. 368166 contains 

 25 topotypes. 



ANACHIS DALLI, new species 



Plate 1, Figure 2 



The shell is small, ovate, and pale yellowish, with an inter- 

 rupted zone of large chestnut-colored spots immediately above the 

 periphery and a second zone of interrupted spots of the same color 

 halfway between the last and the tip of the base. There is also a 

 zone of white, which girdles the whorls immediately posterior to 

 the dark zone on the spire. Tliis light zone occupies about two- 

 thirds of the space between the dark zone of spots and the summit. 

 Interior of aperture of the same color as the outside. Nuclear 

 whorls 3, strongly rounded, separated by a moderately impressed 

 suture, smooth, forming a small pointed apex. Postnuclear whorls 

 moderately well rounded, narrowly shouldered at the summit, crossed 

 by very slightly protractively slanting axial ribs, of which 16 occur 

 upon all the whorls. The spaces separating the axial ribs are about 

 as wide as the ribs and are crossed by fine, closely spaced incre- 

 mental lines. The spiral sculpture consists of moderately strongly 

 incised spiral lines, of which the first marks the posterior limit 

 of the white spiral band. This incised line is a little stronger 

 than the rest and passing over the ribs gives them a beadlike effect 

 at the summit. The second incised spiralline is a little anterior to 

 the posterior edge of the dark zone, which is crossed by two more 



