This historic book may have numerous typos and missing text.
Purchasers can usually download a free scanned copy of the original
book (without typos) from the publisher. Not indexed. Not
illustrated. 1892 edition. Excerpt: ...radiately striated, the end
valves similarly sculptured. The entire surface is microscopically
granulated in quincunx pattern.. Inside having 13 slits in the
anterior, 1 in the central, 17 in the posterior valve; teeth
pectinated, eaves small; sinus wide, flat, with 12-16 teeth. Girdle
olive-brown, in all the varieties of valve-coloring; scales solid,
rounded, regularly imbricating, and small for the size of the
shell. Length 82, width 38 mill.; divergence 98. Distinguished by
its comparative smoothness, unusually elongated form, and highly
ridged back. Shell oval or oblong, elevated, the dorsal ridge
angular, sideslopes nearly straight. Vhitish or olive, very closely
and regularly striped with brown or lead-colored lines which are
concentric on the end valves and lateral areas and converge forward
on the central areas; often blotched on some or all of the valves
with lead-brown The lateral areas are separated from the central
areas by an oblique curved ridge, but scarcely raised; sculptured
with 6 or 7 low radiating riblets, somewhat decussated by
longitudinal subobsolete riblets. The central areas are sculptured
with longitudinal riblets finer than those of the lateral areas.
End valves having radiating riblets and less distinct concentric
line, the umbo of posterior valve near the front margin. Interior
pale blue; sinus flat, toothed; anterior valve having 10, central
valves 1, posterior valve 13 slits; teeth blunt, pectinated. Girdle
clothed with smooth, convex, imbricating scales. Length 53, breadth
34 mill. Length 56, breadth 31 mill. Valparaiso, Chili. This
well-known species is of a bronze-olive color, closely lineated
with brown or olive. The lines are not distinctly enough shown in
the figures. The range of variation in contour...
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