86 BULLETIN 91, UNITED STATES NATIONAL MUSEUM. 



preceding turn for half its length; parietal wall glazed with a thin 

 callus. 



The type, Cat. No. 250369, U.S.N.M., comes from Port Alfred 

 (Coll. No. 1242), has four postnuclear whorls, and measures: Length, 

 1.5 mm.; diameter, 0.6 mm. 



ODOSTOMIA (EGILINA) TURTONI, new species. 

 Plate 19, fig. 3. 



Shell small, elongate-conic, milk white. Nuclear whorls, at least 

 two, deeply, obliquely, immersed in the first of the succeeding turns. 

 Postnuclear whorls moderately rounded, feebly shouldered at the 

 summit; marked by very regular, somewhat sinuous, slightly pro- 

 tractive axial ribs, of which 24 occur upon the first, 26 upon the 

 second and third, and about 40 upon the last turn. These ribs are 

 separated by well-impressed intercostal spaces which are about equal 

 to the axial ribs in width. In addition to the spiral sculpture the 

 whorls are marked between the sutures by a strong spiral cord which 

 adjoins the suture. The summit of the whorls is rendered slightly 

 crenulated by the curving of the ribs. Sutures strongly impressed; 

 periphery of the last whorl marked by a narrow sulcus, which is 

 crossed by the continuations of the axial ribs; base short, moderately 

 umbilicated, marked by feeble, thread-like continuations of the axial 

 ribs and six low, well-rounded, weak spiral threads, which diminish 

 greatly in size and spacing from the periphery to the umbilical area, 

 where they are quite obsolete. Aperture quite large, oval; posterior 

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

 inner lip strongly curved and slightly reflected; parietal wall covered 

 by thick callus. 



The type and three specimens, Cat, No. 227733, U.S.N.M., (Coll. 

 No. 828) , come from Port Alfred. The type has almost five postnuclear 

 whorls, and measures: Length, 2 mm.; diameter, 0.9 mm. 



ODOSTOMIA (PYRGULINA) ARFICA, new species. 

 Plate 18, fig. 7. 



Shell elongate-ovate, rather solid, bluish white. Nuclear whorls 

 decollated. Postnuclear whorls well rounded, strongly shouldered 

 at the summit, marked by stout, well-rounded, somewhat sinuous, 

 decidedly pro tractive, axial ribs, which are about as wide as the spaces 

 that separate them. Of these ribs, 14 occur upon the first, 16 upon 

 the second, 18 upon the third, and 22 upon the penultimate turn. 

 These ribs render the summit of the whorls decidedly crenulated. In 

 addition to the ribs the intercostal spaces are marked between the 

 sutures by exceedingly fine, closely spaced, spiral striations, of which 

 about 35 are present upon the third turn. Sutures strongly im- 

 pressed. Periphery of the last whorl well rounded. Base moder- 



