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PECTINIDAE 363
Pecten tereinus Dall Tereinus Scallop
Southern Florida and the Gulf of Mexico.
I inch in size, quite fragile. Upper (left) valve flat, with about 20 small,
narrow ribs; lower valve deep to moderately deep and with low, irregularly
defined, roundish ribs. Color whitish tan, slightly translucent, with faint
mottlings of pink near the beaks. Rarely, the flat valve may be flecked with
brown, zigzag, fine lines. A rare species uncommonly dredged by private
collectors in 10 to 40 fathoms.
Genus Chlamys Roding 1798
Chlamys sentis Reeve Sentis Scallop
North Carolina to southeast Florida and the West Indies.
Place 34a
I to i^ inches in length, but not so wide (like a fan opened only 80
degrees). Valves rather flat. One hinge ear small, the other twice as large.
With about 50 ribs of varying sizes, each with tiny, closely set scales. There
are 2 to 4 smaller ribs between the slightly larger ones. Color commonly
brilliant: purple, red, vermilion, orange-red, brownish, white or mottled
(especially near the beaks). Common under rocks below low-tide mark.
Do not confuse with ornata, mildredae or be?iedicti.
Chlamys inildredae F. M. Bayer Mildred's Scallop
Southeast Florida and Bermuda.
Plate 34c
I to I ^ inches in length, similar to sentis and ornata, but the ribs of the
upper valve (one without the byssal notch) 30 in number and every third
or fourth one larger. Sculpture of rather large, erect scales set about i mm.
apart. Ribs of lower valve about 30, in groups of 2 or 3. Exterior color
much like sentis; interior yellowish with purple stains near the margins.
Rare under rocks at low tide.
Chlamys ornata Lamarck
Southeast Florida to the West Indies.
Ornate Scallop
Plate 3 4b
I to 1% inches in length, similar to sentis, but with about 18 high, major,
slightly scaled ribs separated by 2 small, scaly cords on the upper valve.
Ribs of lower valve are in 18 groups of 3#closely spaced riblets. Exterior
ivory to yellowish cream with strong maculations of maroon or purplish.
Interior usually white. Compare with mildredae. An uncommon and favorite
collector's item.