SOUTH AFRICAN MARINE MOLLUSKS. 41 



MARGINELLA, species? 



Cat. No. 250321, U.S.N.M., contains a young white individual, of 

 moderate size, broad outline, and quadruplicate columella, which we 

 are unable to refer to any of the known species. Port Alfred (Coll. 

 No. 1194). 



MARGINELLA ALFREDENSIS, new species. 

 Plate 1, fig. 2; plate 10, fig. 4. 



Shell elongate-ovate, bluish white, semitranslucent. The whorls are 

 so arranged as to overlap partly at the summit, which gives the sum- 

 mit a broadly, evenly rounded aspect. The left margin of the shell 

 is well rounded. The outer lip is flattened in the middle, curving 

 gently toward the summit above this, and a little more abruptly 

 basally. Aperture narrow, lunate, a little wider basally than anteri- 

 orly; outer lip thickened at the edge; inner lip appressed to the body 

 whorl, with a thin callus, the basal portion of which terminates in 

 a slender fasciole. The inner lip is armed with eight subequally 

 spaced folds which diminish in size from the first, which equals the 

 basal fasciole in strength, to the last. 



The type and three specimens of this species, Cat. No. 186727, 

 U.S.N.M., come from Port Alfred (Coll. No. 86). The type has four 

 and one-half whorls and measures : Length, 2.5 mm. ; diameter, 1.7 mm. 

 Eight additional lots of this species, all from Port Alfred, are in the 

 collection of the United States National Museum. Cat. No. 186990, 

 six specimens (Coll. No. 522) ; Cat. No. 250338, three specimens (Coll. 

 No. 1211); Cat. No. 250340, one specimen (Coll. No. 1213); Cat. No. 

 250341, 11 specimens (Coll. No. 1214); Cat. No. 250339, one specimen 

 (Coll. No. 1212); Cat. No. 250337, one specimen (Coll. No. 1210); 

 Cat. No. 250344, one specimen (Coll. No. 1217); Cat, No. 250342, 12 

 specimens (Coll. No. 1215). 



MARGINELLA ALGOENSIS Smith. 



Five lots of this species are in the collection of the United States 

 National Museum, all from Port Alfred. Cat, No. 186722, four spec- 

 imens (Coll. No. 81). Cat. No. 249665, three specimens (Coll. No. 

 937); Cat, No. 249664, six specimens (Coll. No. 936); Cat, No. 250335, 

 two specimens (Coll. No. 1208); Cat. No. 250336, one specimen 

 (Coll. No. 1209). 



MARGINELLA ALMO, new species. 

 Plate 21, fig. 1. 



Shell ovate, semitranslucent, milk white. Spire short, broadly, 

 roundedly conic Suture slightly impressed. Surface marked with 

 exceedingly fine lines of growth only. Aperture very long, widening 

 somewhat anteriorly; outer lip thickened at the edge and very finely 

 denticulated on the inner margin, the denticulations extending 



