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 



Place 34a 



North Carolina to southeast Florida and the West Indies. 



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 



Plate 34c 



Southeast Florida and Bermuda. 



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 Ornate Scallop 



Plate 3 4b 



Southeast Florida to the West Indies. 



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. 



