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Rh margin of the valve. One valve pure-white, the other with broad, rose rays corresponding to the ribs. Internally white and with weak, fine ribs. Rare, but has been brought in by commercial trawlers. This is P. tryoni Dall. Aequtpecten phrygius Dall Spathate Scallop Off Cape Cod to east Florida and the West Indies. About I inch in size. Characterized by its peculiar spathate or open- fan shape. With 17 sharp ribs. On closer inspection, it will be seen that each rib is composed of 3 rows of very fine, closely packed scales which are welded together to form a single rib. In cross-section, this would give the rib the shape of the letter M. Hinge-line straight with one ear slightly shorter than the other. Color dull-gray with indistinct blotches of dull- pink. Uncommonly dredged off Miama and the Lower Keys. Aequipecten Uneolaris Lamarck Wavy-lined Scallop Florida Keys to the Lesser Antilles. 1 to 2 inches in size, ears about equal. Valves moderately inflated. Sur- face highly glossy, the colored valve with about 18 very low, rounded ribs. Bottom valve white. Top valve rosy-tan with characteristic, numerous small, wavy, thin lines of pink-brown running concentrically. A few brown mot- tlings may be present. A very gorgeous and rare species dredged from 7 to 50 fathoms. A. may aguezensis Dall and Simpson is this species. Aequipecten muscosus Wood Rough Scallop Plate 34d, e North Carolina to both sides of Florida and the West Indies. % to I ^ inches in size, both valves inflated and fairly deep. Hinge-ears equal to the width of the main part of the shell. 18 to 20 ribs, the center part of each bearing prominent, erect, concave scales, and on each side 2 rows of much smaller scales. Color orange-brown, red, lemon-yellow, orange, or commonly mottled with purple. Beach-worn specimens may lose most of their scaliness. Moderately common just offshore to 90 fathoms. Formerly called exasperatus Sby. and fusco-purpureus Conrad. Subgenus Flagiocteniuin Dall 1898 Aequipecten irradians Lamarck Atlantic Bay Scallop Plate 33! Nova Scotia to northern half of Florida and Texas. 2 to 3 inches in size. This is the common edible scallop of our east