NO. 1452. NOTES ON PYRAMIDELLID.E—DALL AND BAKTSCH. 855 



them a subnodulose effect at this point. Intercostal spaces smooth, 

 about as wide as the axial ribs, decidedly depressed in the middle — that 

 is, between the bead at the summit and the nodules at the peripher3\ 

 Periphery of the last whorl deeply sulcate. Base well rounded, 

 marked by about nine spiral lirations, the jK^sterior one of which is 

 decidedly wider than the rest; the depressed spaces between the lira- 

 tions are marked b}- tine axiaf threads. Both the spiral lirations and 

 the spaces between them gradually diminish in width from the periph- 

 ery to the umbilical area. Aperture suboval, posterior angle acute, 

 columella strongh^ oblique, somewhat revolute, reenforced by the some- 

 what attenuated base and provided with a fairly strong oblique fold 

 near its insertion; parietal wall covered by a thick callus, which gives 

 the peristome a continuous appearance. On the last whorl the first 

 basal keel appears above the sutures, which is therefore not channeled 

 like the sutures of the preceding whorls. 



The specimen described has four post-nuclear whorls and measures: 

 long. 1.8 mm.; diam. .8 mm. It belongs to the Ptetel collection and 

 comes from Japan. It was labeled PdrtJienia p((godvla A. Adams, 

 but is not that species. 



ODOSTOMIA (MIRALDA.?) JAMAICENSIS Clessin. 

 Plate XVII, fig. (). 



Miralda jamaicensis Clessin, Martini-Chemnitz, Conchylien Cabinet, 2d ed., 

 Pyramid., 1900, p. 262, ])1. xxxiv, Hg. 6. 



Shell elongate-ovate, turrited, milk-white. Nuclear whorls two, 

 small, helicoid, obliquely half immersed in the first of the succeeding 

 volutions. Post-nuclear whorls moderately rounded, strongl}^ tabu- 

 I lately shouldered at the summit, ornamented by broad, slightly 

 1 rounded spiral keels, three of which occur between the sutures on the 

 I first and second, and four upon the penultimate whorl. The posterior 

 one of these keels is situated at the summit of the whorl and is not as 

 \ wide as the others, and appears as if it might be strongly crenulated 

 i in well-preserved specimens. The second keel also shows traces of 

 crenulations. The incised channels between the keels are about one- 

 fourth as wide as the keels and are crossed by very fine, raised, quite 

 closely spaced, backward-slanting axial threads. Periphery and base 

 of the last whorl well rounded. The latter marked by a strong raised 

 spiral keel on its middle and a lesser tumid area at the umbilical 

 i- region; the space between the middle keel and the periphery appears 

 ■ to be without spiral sculpture. The entire base is crossed by lines of 

 'growth. Sutures very strongly channeled. Aperture large, broadly 

 oval, somewhat produced at the junction of the columella and lip; 

 ■posterior angle obtuge, outer lip rather thick; columella strong, 

 curved, reenforced by the attenuated base and provided with a moder- 

 ately strong oblique fold near its insertion. 



