PECTIN ID AE 361 



row, elongate chondrophore which is flanked on each side by a fluted tooth 

 and a socket. 



Plicatula gibbosa Lamarck Kitten's Paw 



Plate 356 



North CaroHna to Florida, the Gulf States and West Indies, 



About I inch in length, somewhat cat's-paw-shaped. Shell strong, 

 heavy, with 5 to 7 high ribs which give the valves a wavy, interlocking 

 margin. Hinge in upper valve with 2 strong, equally sized teeth; lower 

 attached valve with 2 sockets in the hinge with 2 smaller teeth set rather 

 close together. Color dirty-white to gray with red-brown or purplish lines 

 on the ribs. A common intertidal to offshore species. 



Family PECTINIDAE 



Because of the great number of fossil and living species of scallops and 

 the almost limitless modifications exhibited by them, there have been no 

 less than 50 genera and subgenera proposed in this family by various authors. 

 Doubtlessly, many more will be invented. Most, if not all, of these genera 

 are closely integrated by connecting species. Workers have a choice of 

 using the single genus, Pecteji, or employing a genus for nearly every species. 

 We are arbitrarily employing only six genera — Pecte??, Aequipecten, Chla- 

 772ys, Placopecten, Lyropecteii and Himiites — and we cannot justify these 

 on biological grounds. It may be noted that we have moved the glassy, thin- 

 shelled Propeamiisshim from the Pectinidae into a family of its own on 

 anatomical grounds. This new family refers to what was once called "Amus- 

 siidae." True Aumsiwn, however, is merely a subgenus of Pecteii connected 

 to it by a series of species in the Euvola group. 



Genus Pecten Miiller 1776 

 Subgenus Pecten s. str. 



Pecten diegensis Dall San Diego Scallop 



Plate 336 



Cordell Bank, California, to Lower California. 



2 to 3 inches in size. Right valve convex with 22 or 23 flat-topped ribs 

 which are generally longitudinally ridged on top. Left valve much flatter, 

 with 21 to 22 narrow, rounded ribs. Dredged from 10 to 75 fathoms. 



Subgenus Patinopecten Dall 1898 

 Pecten caurinus Gould Giant Pacific Scallop 



Plate 29b 



Wrangell, Alaska, to Humboldt Bay, California. 



