358 PROCEEDINGS OF THE NATIONAL MUSEUM. vol. xxx. 



There are live specimens of this species in the Berlin collection. 

 They were obtained by Hilgendorf at Hakodate, Japan. The one 

 above described has six post-nuclear whorls and measures: long. 

 4.2 mm. ; diam. 1.9 mm. There is considerable diversity in the expres- 

 sion of the incised spirals in the several specimens; in one they are 

 almost obsolete on the base. One individual is decidedly more obese 

 than the rest (fig. 3). It has six post-nuclear whorls and measures: 

 long-. -l.S mm.; diam. 2.5 nmi. Another badly- worn individual from 

 Japan was labeled Vaiiesla evarafa A. Adams. 



ODOSTOMIA (ODETTA) LECTISSIMA, new species. 

 Plate XXIII, tig. ;i 



Shell elongate, ovate, milk-white. Nuclear whorls moderatel}" large, 

 almost I)uriod in the tirst post nuclear whorls, only the tiunid periph- 

 ery^ of the last volution and a mere speck of another turn are visible. 

 Post-nuclear whorls inflated and strongly, slopingly shouldered, orna- 

 mented Ix^twcen the sutures by five spiral keels, the posterior one of 

 which is nmch less developed than the rest and occupies the space at 

 the suture on the shoulder. The other four are strong, well rounded, 

 subequal and subequall}^ spaced. The first one is at the shoulder, and 

 the anterior edge of the fourth l)ounds the peripheral sulcus. The 

 sulci between these spiral cords are deep, a little wider than the cords 

 and crossed by ver}^ regular and regularl}'^ spaced, backward-slanting, 

 raised axial threads, which, were they not interrupted by the spiral 

 keels, would form continuous lines from the simimits to the umbilical 

 region. Base of the last whorl short, well rounded, somewhat pinched 

 l)ehind the columella but not perforated, sculptured like the space 

 between the sutures, having five spiral keels. Aperture large, some- 

 what produced at the junction of the outer lip and the columella; 

 posterior angle obtuse; outer lip thin, decidedly wavj^ in outline, 

 showing the external sculpture within; columella straight, slender, 

 somewhat revolute, with a weak fold near its insertion which is not 

 apparent when the aperture is viewed squarely; parietal wall covered 

 by a thin callus. 



The type belongs to the Pastel collection and is from Japan. It has 

 four post-nucl(^ai- whorls and measures: long. 1.7 nun.: diam. .1mm. 



ODOSTOMIA (ODETTA) FELIX, new species. 



Plate XXI, lig. 2. 



Shell broadly elongate-conic, turrited, subdiaphanous. Nuclear 

 whorls small, almost completely obli(|uely immersed, onl}' part of 

 the last rounded volution is visible above the first of the later whorls. 

 Post-nuclear whorls somewhat inflated, well roinuled, moderately shoul- 

 dered, marked by strong. e(iually develoi)ed. spiral keels which are 

 separated by sube(|ual, deep, rounded sulci. The latter are somewhat 



