420 American Seashells 



close together. Posterior end with wavy ribs consisting of fine mud particles 

 laid down over the shell by the animal. There is an enclosed, elongate fur- 

 row between the beaks and the hinge. Color yellowish white. Found in 

 burrow holes in coral rocks. Not uncommon. 



Subgenus Fetricolaria Stoliczka 1870 

 Fetricola pholadiformis Lamarck False Angel Wing 



Plate 32Z; figure 94b 



Gulf of St. Lawrence to the Gulf of Mexico and south, 



2 inches in length, elongate, rather fragile and chalky-white. With 

 numerous radial ribs. The anterior 10 or so are larger and bear prominent 

 scales. Ligament external, located just posterior to the beaks. Cardinal teeth 

 quite long and pointed. The siphons are translucent-gray, large, tubular and 

 separated from each other almost to their bases. A very common clay and 

 peat-moss borrower. 



Genus Rupellaria Fleuriau 1802 

 Rupellaria typica Jonas Atlantic Rupellaria 



Plate 306 



North Carolina to the south half of Florida and the West Indies. 



About I inch in length, oblong, flattened anteriorly; compressed, usually 

 attenuated and gaping posteriorly. Beaks point anteriorly. Exterior gray or 

 whitish and with numerous, irregularly spaced, coarse radial ribs. Interior 

 uneven and brownish gray. This coral borer is variable in shape and uneven 

 in texture. It may also be truncate at the posterior end. Moderately common. 



Rupellaria tellimyalis Carpenter West Coast Rupellaria 



Plate 3 It 



Santa Monica, California, to Mazatlan, Mexico. 



I to I % inches in length. Oblong-elongate, variable in shape and out- 

 line due to crowding in the rock burrow. Shell fairly thick, white, except 

 for purplish blotches commonly behind the hinge and at the posterior end. 

 Radial threads are coarser at the anterior end. Growth lines are irregular 

 and coarse. Pallial sinus broadly rounded at its anterior end. Early or nep- 

 ionic shell is shaped somewhat like a Donax, smooth, translucent purplish 

 brown and rarely found attached at this early stage to rocks and kelp stalks. 

 R. calif orniensis Pilsbry and Lowe is identical. 



Rupellaria dejiticulata Sowerby known only from Peru has a similar 

 nepionic shell (contrary to other reports), has a narrower, triangular pallial 

 sinus, and (contrary to reports) is a more fragile shell. Its anterior end is 



