118 TESTACEOUS MOLLUSCA. 
subradiatingly painted with brown; posterior side the shorter, but 
somewhat produced; anterior side rather sloping; margins de- 
pressed ; with concentric ribs which are lamellar anteriorly, obtuse 
and broadish centrally, sublamellar posteriorly: umbones rather 
prominent ; ventral margin rounded, denticulated within. 1+... 
2,.—Peru. 
V. Ausrrauis. Sow. Z. P. 1835. Ovate, subtriangular, 
thickish, somewhat tawny, with subradiating subtriangular spots ; 
with elegant crowded thin concentric ridges, which are obtuse, more 
elevated near the sides and radiatingly decussated ; dorsal edge rather 
elevated, ventral rounded and denticulated within. -%..145.— 
Swan River. 
V. CosreLuatTa. Sow. Z. P. 1835. Obovate, brownish, some- 
times prettily dotted at the apices, turgid, with concentric reflected 
lamellar riblike striz, which are more prominent on the anterior 
side, and are decussated by impressed radiating white lines: lunule 
distinct and heart-shaped, its margins somewhat raised in the 
centre, inside white, margin crenulated. 23,..23.—Chili and 
Peru. 
V. Crenirera. Sow. Z. P. 1835.—Elliptic, rough, whitish, 
spotted and variously painted with brown, with short crowded con- 
centric ridges, decussated by very close set radiating striz: pos- 
terior cardinal tooth large and elongated. 11..12.— West 
Columbia.— Variety. Uniform brownish, with some of “the strize 
elevated and riblike.— Peru. 
V. Crassicosta. Quoy. Ast. t. 84. f. 1, 2. Transversely 
ovate, heart-shaped, rather thick, yellowish grey, with distant thin 
slightly waved transverse ridges, and equal rounded longitudinal 
ribs: inside white, with an anterior violet stain ; margin very finely 
crenated.—New Zealand. 
V. Discors. Sow. Z. P. 1835. Oboval, thickish, with crowded 
radiating striz, posteriorly decussated by wrinkles; white, nearly 
covered with blackish brown, the disposition of the colouring of the 
two valves different; a rather elevated dorsal line ; inside white, 
stained with violet on the anterior side, margin crenulated, 13. .15% 
—C. § S. America. 
V. Fusco-tineata. Brod. & Sow. Z. P. 1835. Obovate, 
whitish, with radiating rib-like striz, which are posteriorly sub- 
decussated; with waved sub-oblique lines, and sometimes two brown 
rays; dorsal edge straightish, anteriorly subangulated; posterior 
side short, lunule short ; inside purplish, 14..13.—C. America. 
V. Levcopvon. Sow. Z. P. 1835. Elliptic, thickish, some- 
what ashy, with concentric smooth reflected rib-like strize, decus- 
sated by crowded radiating ones; anterior dorsal area and the lunule 
brown ; inner margin denticulated, the denticles white, the inter- 
stices black. 13,..1,%,— California. 
