356 I'ROrEEDlXaS OF THE NATIONAL Ml'SEVM. vol. xxx. 



There are two specimens in tiie Berlin collection, No. 28742, from 

 Jamaica, obtained b}^ Verkruzen; they have the aspect of Bowden bed 

 fossils. The best presei'vod individual has four post-nuclear whorls and 

 measures: long-. 2.1 mm.; diani. 1.2 nun. If the specimens prove to 

 be not crenulated, but simpl}' spirallj^ keeled, then it will have to be 

 transferred to the subg-enus Odetta. Clessin's figure of this species" is 

 wretched}}' poor. 



ODOSTOMIA (MIRALDA) DIADEMA A. Adams. 

 Plate XVII, fig. 2. 

 Pnrthenia dUtdei)i<( A. Adams, Ann. Mag. Nat. Hist., V, 1860, p. 479. 



Shell small, subovate, minutely umbilicated, with the summits of the 

 whorls decidedly tabulated, white. Nuclear whorls two, moderately 

 large, helicoid, about one-third immersed in the later whorls. Post- 

 nuclear whorls moderatel}'' rounded, decidedly tabulated at the summit, 

 ornamented by rounded, axial ribs which quickly diminish in strength 

 as they pass from the summit of the whorls to the i)eriphery: sixteen 

 of these ribs occur upon the second, and twenty upon the penultimate 

 whorl. The ril)s are thickened at the anterior termination of the 

 shoulder and render it decidedU' crenulated. Intercostal spaces a little 

 wider than the ribs. In addition to the axial ribs the whorls are 

 marked by strong spiral cords, two of which can be seen between the 

 sutures on the tirst and second and four and one-half upon the penulti- 

 mate whorl; the junction of the posterior one of these two cords and 

 the axial ribs form a series of tubercles. The anterior cord is onh' 

 slightly tuberculatcd, the ribs extending onl}^ feebly to it. Peripher}- 

 and base of the last whorl well rounded, the latter decidedly attenuated 

 and mai-kcd ])y seven subeijual and subequally spaced spiral keels. 

 Aperture large, suboval, posterior angle very obtuse, outer lip thick, 

 columella reenforced by the attenuated base, curved, provided with a 

 conspicuous oblicpie fold near its insertion: parietal wall covered by a 

 moderately thick callus. 



There are two specimens of this species in the Berlin collection, col- 

 lected in Japan and obtained from H. Adams. The ])etter preserved 

 one of the two has been described. It has live post-nuclear whorls and 

 measures: long. 2.3^mm. ; diam. 1.2 mm. 



ODOSTOMIA (MIRALDA) GEMMA A. Adams. 



riatt' XXII, fig. ]. 

 Cltrijsdllifht fjemvia A. Adams, Ann. Mag. Nat. Hist., VIII, 1861, p. 'M2. 



Shell small, elongate-conic, slender, slightly mnl)ilicated, white. 

 Nuclear whorls at least two, obliquely about half immersed in the 

 Hist of Ihc later whorls. Post-nuclear whorls flattened, with strong 



a Martini-Chemnitz, Conchylien Cabinet, 1900, p. 262, pi. xxxiv, fig. 6. 



