NOTES ON I'YRAMIDKrJJD.E—DALL AND BARTSCII. 34V) 



whorl well rounded, sculptured, like the spaces between the sutures, 

 l)y the axial ribs which continue prominently to the narrow umbilicus, 

 and six suV)equal and subequally spaced spiral threads, with an indica- 

 tion of a very weak seventh within the narrow umbilicus. Aperture 

 moderately larg-e, ovoid, posterior angle obtuse, outer lip strong^, colu- 

 mella slender, decidedly curved, and somewhat revolute, w^ith a promi- 

 nent oblique fold near its insertion; parietal Avail covered by a very 

 strong callus, which gives the peristome a complete appearance. 



The U. S. National Museum has two specimens from A. Adams, col- 

 lected in Japan, No. 126005, the larger one of which has furnished 

 the figure and the above description, excepting the aperture, which is 

 imi)erfect in this specimen and was described from the second indi- 

 vidual. The largo one has seven post-nuclear whorls and measures: 

 long. 2.6 mm. ; diam. 0.!> mm. The Pastel collection contaiiis one from 

 Japan. 



ODOSTOMIA (PARTHENINA) META, new species. 

 Plate XXIII, lig. 5. 



Shell milk-white, very small, thin, turrited, with channeled sutures 

 and obtuse apex. Nuclear whorls small, strongly obliquel\' immersed 

 in the first post-nuclear whorl; only a portion of the last volution is 

 visible. Post-nuclear whorls somewhat overhanging, rather high 

 between the sutures, shouldered at the summit, flattened, suddenly 

 contracted below the periphery.- The summits of succeeding whorls 

 fall considerably anterior to the periphery", which appears decidedly 

 angular. The whorls are marked by strong axial ribs which extend 

 undiminished over the angular peripher}^ and base of the last whorl 

 to the umbilical regioy. Sixteen of these ribs occur upon the second, 

 twenty-two upon the fourth and the penultimate whorl. The ribs are 

 slightl}" constricted just below the summit, which gives them a beaded 

 appearance. Intercostal spaces about twice as wide as the ribs, crossed 

 by two closel}^ placed, raised spiral threads, the anterior one of which 

 marks the angulation of the periphery. The junction of ril>s and 

 spiral threads is subnodulose. Base moderately long, narrowly um])il- 

 icate. Aperture suboval, posterior angle obtuse, outer lip rather thick, 

 LK)lumella strongly curved, with a prominent oblique fold near its inser- 

 tion; parietal wall covered with a heavy callus, which gives the peri- 

 stome a completed aspect. 



The specimen described belongs to the Pastel collection and comes 

 from Japan. It has six post-nuclear whorls and measures: long. 2.1 

 mm.; diam. 0.8 mm. 



