12 PROCEEDINGS OF THE NATIONAL MUSEUM vol. 00 



lip thin, showing the external sculpture within; inner lip rather 

 stout, provided with an oblique fold a little anterior to its insertion. 

 The type (Cat. No. 363085, U.S.N.M.) has lost the nucleus and 

 probably a fraction of the first nuclear turn. The seven remaining 

 whorls measure, length, 3.2 mm. ; diameter, 1.1 mm. 



ODOSTOMIA (CHRYSALLIDA) QUILLA, nev. species 



Plate 2, fig. 2 



Shell small, elongate-ovate, semitranslucent, bluish-white. Nu- 

 clear whorls decollated. Postnuclear whorls flattened, almost ap- 

 pressed at the summit, marked by strong retractively slanting axial 

 ribs, of which IG occur upon the first and 18 upon the remaining 

 turns. Interco.stal spaces a little wider than the ribs, crossed by 

 four series of broad subequal spiral pits. The space between the 

 summit and the first of these is about three times as wide as the 

 spaces that separate the rest, which form rather slender spiral cords 

 that scarcely render the junction with the ribs nodulose. The spaces 

 inclosed between the spiral cords and axial ribs are quadrate pits, 

 having their long axis parallel with the spiral sculpture. The pe- 

 riphery would be deepljT^ channeled were it not for the axial ribs which 

 connect across from the summit of the succeeding turns. Periphery 

 well rounded. Base marked by five almost equal strong spiral cords 

 which are separated by narrow channels. Aperture oval; posterior 

 angle acute; outer lip thin, showing the external sculpture within; 

 inner lip very stout and reflected over and appressed to the base for its 

 entire length and provided with a rather strong oblique fold at its 

 insertion; parietal wall covered with a rather thick callus. 



The type (Cat. No. 363086, U.S.N.M.) has almost six whorls and 

 measures, length, 1.8 mm.; diameter, 0.7 mm. Cat. No. 363087, 

 U.S.N.M., contains another specimen. This species is remarkable for 

 its exceedingly strong axial ribs and its rather feeble spiral sculp- 

 ture ; also in having the whorls practically appressed at the summit. 



ODOSTOMIA (CHRYSALLmA) VIRA. new species 



Plate 2, fig. 3 



Shell small, very elongate-ovate, semitranslucent, milk-white. 

 Nuclear whorls decollated. Postnuclear whorls slightly rounded, 

 narrowly shouldered at the summit, rather high between summit and 

 suture, marked by 18 strong almost vertical axial ribs. Intercostal 

 spaces about one and one-half times as wide as the ribs, crossed by 

 four slender spiral cords which are equal in strength and divide the 

 spaces between them into broadly rectangular well-impressed pits 

 that have their long axis parallel with the spiral sculpture. At the 



