SOUTH AFRICAN MARINE MOLLUSKS. 91 



The type and two specimens, Cat. No. 250362, U.S.N.M., come 

 from Port Alfred (Coll. No. 1235). The type has six postnuclear 

 whorls, and measures: Length, 3.8 mm.; diameter, 1.8 mm. 



We have seen three additional lots of this species which are in 

 Colonel Turton's collection, all from Port Alfred : 29 specimens (Coll. 

 No. 1589); 33 specimens (Coll. No. 1590); 2 specimens (Coll. No. 

 1599). 



ODOSTOMIA (EVALEA) ACRIFA, new species. 

 Plate 16, fig. 3. 



Shell elongate-conic, bluish white, with five equal and equally 

 spaced, narrow, yellowish, spiral bands, which correspond with internal 

 lirations. Nuclear whorls depressed helicoid, obliquely immersed in 

 the first of the succeeding turns, above which a very small portion of 

 the tilted edge of the last volution only projects. Postnuclear whorls 

 quite strongly rounded, narrowly shouldered at the summit, marked 

 by rather strong lines of growth, which have a tendency on the later 

 whorls to divide the surf ace of the shell into riblets at the shoulder, 

 and numerous, very fine, spiral stria tions. The posterior limit of the 

 interior of each whorl is seen through the texture of the shell and 

 gives this the appearance of having a double suture. Sutures 

 strongly constricted. Periphery of the last whorl inflated and 

 strongly rounded. Base short, conspicuously umbilicated, inflated, 

 well rounded, marked like the spire by lines of growth and fine spiral 

 lines. Aperture broadly ovate; posterior angle acute; outer Up thin, 

 showing five lirations within, between the posterior angle and the 

 periphery; inner lip curved, slightly reflected but distinct, provided 

 with a strong oblique fold opposite the umbilicus; parietal wall cov- 

 ered by a moderately thick callus. 



The type, Cat. No. 250364, U.S.N.M., comes from Port Alfred 

 (Coll. No. 1237). It has six postnuclear whorls, and measures: 

 Length, 3.4 mm.; diameter, 1.4 mm. 



ODOSTOMIA (ODOSTOMIA) IRAFCA, new species. 

 Plate 18, fig. 2. 



Shell minute, translucent, yellowish white. Nuclear whorls deeply 

 immersed in the first of the succeeding turns, above which the tilted 

 edge of the last volution only projects. Postnuclear whorls inflated, 

 strongly rounded, appressed at the summit, marked by rather coarse 

 lines of growth. Sutures strongly constricted. Periphery of the last 

 whorl inflated and also well rounded. Base somewhat attenuated, 

 very slightly umbilicated, marked like the spire. Aperture broadly 

 oval; outer Up thin, somewhat effuse; inner lip strongly curved, 

 somewhat twisted, and strongly reflected, provided with a strong 

 oblique fold opposite the umbilical chink ; parietal wall covered with 

 a thin callus. 



