132 BULLETIN 91, UNITED STATES NATIONAL MUSEUM. 



enclosed by the ribs and cords are deep rectangular pits, having their 

 long axis parallel with the spiral sculpture. Periphery well rounded. 

 Base moderately protracted, marked by the continuations of the 

 axial ribs which become much enfeebled as they approach the colu- 

 mella, and six spiral cords, of which the posterior two are of the strength 

 and spacing of those on the spire, while the other four are separated 

 from these two by a space about one and one-half times as wide as 

 the spaces between the cords on the spire, and are much closer 

 approximated to each other than the rest. These four are succes- 

 sively weaker from the posterior to the anterior, the latter becoming 

 quite feeble. Aperture irregularly oval, oblique, partly channeled 

 anteriorly; posterior angle obtuse; outer lip reenforced by a heavy 

 callus; parietal wall covered by a thick callus. 



Doctor Gould's type, Cat. No. 157, U.S.N.M., was collected by 

 William Stimpson, on the North Pacific Exploring Expedition, in 

 Simons Bay. It has eight postnuclear whorls, and measures: 

 Length, 5.8 mm.; diameter, 2.1 mm. 



Genus MICROSETIA Monterosato. 



MICROSETIA CONSPECTA Smith. 



Cat. No. 186821, U.S.N.M., one specimen from Port Alfred (Coll. 



No. 187). 



MICROSETIA GISNA, new species. 

 Plate 6, fig. 4. 



Shell small, ovate, light golden brown, excepting the extreme ante- 

 rior portion of the base and the peristome, which are yellowish white. 

 Nuclear whorls one and one-half, inflated, smooth, giving the shell a 

 blunt apex. Postnuclear whorls moderately rounded, feebly shoul- 

 dered at the summit, marked by fine incremental lines only. Sutures 

 moderately impressed. Periphery of the last whorl somewhat in- 

 flated, well rounded. Base moderately long, well rounded, narrowly 

 umbihcated, marked like the spire. Aperture ovate; posterior angle 

 acute; outer lip thin at the edge; inner lip strongly curved and partly 

 reflected over the umbilicus; parietal wall covered with a thin callus. 



The type, Cat. No. 187055, U.S.N.M., comes from Port Alfred 

 (Coll. No. 593). It has almost four postnuclear whorls, and measures: 

 Length, 2 mm.; diameter, 1 mm. 



MICROSETIA HALIA, new species. 



Plate 6, fig. 8. 



Shell small, broadly ovate, light brown. Nuclear whorls not dif- 

 ferentiated from the postnuclear turns. Postnuclear whorls well 

 rounded, appressed at the summit, through which the preceding whorl 

 can be seen, which lends the shell the appearance of having a rather 

 broad brown band at the summit; surface of the shell marked by 



