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Type: Artemis africana Hanley.
Subgenus Raina Marwick, 1927.
Type: Dosinia bensoni Marwick.
Dosinia (Raina) sodalis n. sp. (Figs. 38, 39, 40.)
Shell of moderate size, strong, subcircular. Lunule long and narrow, bounded by deeply-incised line. Escutcheon long and deep, bounded by sharp ridge especially in left valve. Sculpture of high, narrow, erect, regular, well-spaced concentric ridges, about 8 per centimeter, becoming obliquely lamellar on posterior slightly concave area. Left hinge with strong curved posterior cardinal; strong rugose median, and lamellar anterior cardinal, space between last two with deep pit along anterior side. Anterior lateral broad, low, very strongly ridged. Right hinge with fairly strong, bifid, posterior cardinal, stout, rugose median, and short, thin and low anterior cardinal. Space between first two with shallow excavation along posterior side. Anterior pit with low smooth lateral above, strongly grooved below.
Holotype in Dominion Museum.
Height, 52 mm.; length, 52 mm.; inflation (1 valve), 14 mm.
Easily distinguished by the sculpture, concentrated hinge, and very deep escutcheon.
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Dosinia (Raina) imperiosa n. sp. (Figs. 41, 42.)
Shell large and heavy. Lunule large and broad, bounded by incised line. Escutcheon deep, not commencing until shell is about 20 mm. diameter, crossed by fairly strong continuations of the concentric sculpture. Sculpture of strong, bevelled, polished, concentric ridges with slightly narrower interspaces, the ridges becoming narrower and oblique on posterior area. Right hinge with strong, bifid posterior cardinal; strong, triangular, rugose median, and short, strong, high anterior cardinal. Anterior pit deep, with weak, smooth lateral above, strongly rugose below. Nymph with strongly raised anterior margin along groove for left posterior cardinal. Pallial sinus reaching to near middle of shell.
Holotype in Dominion Museum.
Height (estimated), 60 mm.; length (estimated), 60 mm.; inflation (1 valve), 20 mm.
Distinguished from D. sodalis by greater inflation and broader lunule, escutcheon starting at much later stage, broader right posterior and anterior cardinals, and sculpture.