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Description

DIALA AFRICANA, new species

 

Plate 6, fig. 1

 

Shell elongate-conic, subdiaphanous. Nuclear whorls scarcely differentiated from the postnuclear turns. Postnuclear whorls strongly rounded, marked by numerous lines of growth and exceedingly fine spiral striations; the summits of the whorls are suppressed to the preceding turns and allow these to shine through them, which gives the shell the aspect of having a double suture; sutures strongly constricted. Periphery of the last whorl somewhat inflated, well rounded. Base broadly umbilicated, well rounded, marked like the spire. Aperture large; outer lip thin, translucent; inner lip free, strongly curved, and somewhat reflected over the umbilicus; parietal wall glazed by a thin callus.

 

The type, Cat. No. 187063, U.S.N.M., comes from Port Alfred (Coll. No. 601). It has seven and one-half whorls, and measures: Lengths, 4.8 mm.; diameter, 2.1 mm.

 

The following specimens from Port Alfred are in the collection of the United States National Museum: Cat. No. 187067, one specimen (Coll. No. 605). Cat. No. 227746, three specimens (Coll. No. 841). Cat, [sic] No. 249722, two specimen (Coll. No. 994). Cat. No. 250424, three specimens (Coll. No. 1297). Cat. No. 250434, two specimens (Coll. No. 1307). In addition to these I have seen two lots, also from Port Alfred: (Coll. No. 1599), two specimens and (Coll. No. 1593), 30 specimens, which were returned to Colonel Turton.”

 

(Bartsch, 1915: 122)

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Creative Commons Attribution Non Commercial 3.0 (CC BY-NC 3.0)

© National Museum of Natural History, Smithsonian Institution

Source: Antarctic Invertebrates Website (NMNH)

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