138 BULLETIN 91, UNITED STATES NATIONAL MUSEUM. 



NATICA ALFREDENSIS, new species. 

 Plate 13, figs. 4, 7, 10. 



Shell of medium size, irregularly ovate, early whorls bluish, later 

 ones light buff, marked with a series of retractively sloping streaks of 

 brown near the summit, and numerous small dots of brown. The 

 callus and columellar area are white. Early whorls well rounded, 

 the later ones a little less so. The last whorl is strongly appressed 

 at the summit, which lends it a somewhat pinched-in appearance 

 immediately below the summit. Periphery and base of the last whorl 

 well rounded. Aperture oval; outer lip thin, purplish brown deep 

 within, white at the edge; inner lip strongly curved; parietal wall 

 covered with a very thick callus, which is entire. 



The type and two specimens of this species, Cat. No. 187085, 

 U.S.N.M., come from Port Alfred (Coll. No. 627). The type has four 

 and one-half whorls, and measures: Length, 17 mm.; diameter, 14.5 

 mm. Three additional lots are in the collection of the United States 

 National Museum from the same locality. Cat. No. 249752, three 

 specimens (Coll. No. 1024). Cat. No. 249754, two specimens (Coll. 

 No. 1026). Cat. No. 249748, three specimens (Coll. No. 1020.) 



NATICA FORATA Reeve. 



Cat. No. 17096, U.S.N.M., one specimen from Cape of Good Hope. 

 Cat. No. 43134, U.S.N.M., eight specimens from the same place. 

 Cat. No. 46445a, U.S.N.M., one specimen from the same locality. 

 Cat. No. 186830, U.S.N.M., four specimens from Port Alfred (Coll. 

 No. 196). 



NATICA AFRICANA, new species. 

 Plate 13, figs. 13, 14, 15. 



Shell similar to N. forata, but decidedly elevated, and with a much 

 narrower umbilicus. The coloration is as follows : ground color pearl 

 gray; a narrow band, of short, axially disposed streaks of light brown, 

 is situated at the summit; while five, equal and equally spaced, narrow 

 bands encircle the whorls; the first of these is a little farther from the 

 brown band at the summit than from its neighbor anteriorly. These 

 bands are composed of narrow, arrow-shaped elements, which are 

 white, tipped with brown, and are arranged in cone-in-cone series, 

 pointing forward. In addition to these bands, the whorls are 

 marked by alternating lines of light and darker color, which coincide 

 with the lines of growth. The umbilical area and the region adjacent 

 to it, as well as the thin callus, are white, the whorls are well rounded, 

 smooth. Umbilicus narrowly funnel-shaped ; umbilical wall provided 

 with two spiral keels. Aperture oval, dark purple within, thin and 

 white at the edge ; inner lip curved and very slightly reflected ; parietal 

 wall covered with a thin callus. 



