52 



EAST COAST MARINE SHELLS 



GENUS TIVELA Link 1807 



Shell porcellanous, smooth outside, 

 color variable but with tendency toward 

 brown or purple; valves subequilateral, 

 closing tightly, more or less convex, de- 

 void of sculpture; umbones prominent; lig- 

 ament short; teeth of hinge variable in 

 the respective species. 



TIVELA ABACONIS Dall. Shell subtranslu- 

 cent, white, rose or purple and a portion 

 passing into white; only three small car- 

 dinal teeth in each valve. Length 11 mm., 

 smaller in Florida. 



It was first described from Abaco, 

 Bahamas. Entire fresh specimens are often 

 abundant in Palm Beach County, Florida. 



PI. 25, Fig. 1 



Florida; Bahamas; Vera Cruz, 



Mexico 



TIVELA MACTROIDKS Born. Shell oval, valves 

 trigonal, rayed with chestnut, intervening 

 white spaces narrower; umbones of adults 

 more tumid and pointet' than the Juveniles. 

 Length 2 inches. 



PI. 18, Fig. 1 



Florida Keys; Bermuda; West Indies 



GENUS GAFRARIUM Roeding 1798 



GAFRARIUM CERINA C. B. Adams, Shell small, 

 triangular, furrowed; hinge similar to 

 Astarte, lateral teeth present; pallial 

 line without sinus. Length 13 mm. Range 

 1-95 fathoms. 



PI. 18, Fig. 6 



North Carolina to Brazil 



GENUS MACROCALLISTA Meek 1876 



Shell ovate, large, with micro- 

 scopic radial lines; coloration vivid; 

 IvmiHe well defined; three cardinal teeth 

 in each valve; right posterior tooth bifid. 



MACROCALLISTA MACULATA Linnfe. Surface 

 porcellanous with violet brown blotches or 

 waves; epidermis shining; interior white. 

 Length 2.5-3 inches. 



A very handsome species. It has 

 been dredged, in shallow water, on the 

 Florida west coast. Single valves are 

 sometimes taken in Palm Beach County but 

 it is rather rare on the east coast. Dr. 



J. H. Beal reports it from Santa Rosa Is- 

 land, N. W. Florida. 



It occurs in the Pliocene beds of 

 Florida and Costa Rica. During the frigid 

 Miocene age it migrated to warmer waters 

 but returned with the Pliocene and has sur- 

 vived living well up th'3 east coast. 



PI. 20, Fig. 1 



Cape Hatteras, North Carolina to 



Gulf of Mexico; West Indies; 



Brazil 



MACROCALLISTA NIMBOSA Solander. Shell 

 porcellanous, oblong, rather flat, smooth, 

 pinkish fawn color with lilac spots ar- 

 ranged In rays; interior white; anterior 

 end short, narrowed at end; posterior end 

 long, squared; ligament long. Length 4 

 inches. 



The most showy of the American 

 Veneridae and the largest of the genus. It 

 is plentiful at Marco and other points on 

 the Florida west coast. 



PI. 20, Fig. 2 



PI. 54, Fig. 8 



Cape Hatteras, North Carolina to 



Cuba; west to Mobile, Alabama 



^.ENUS PITAR Romer 1857; 

 Pitaria of authors 



Shell plump, striate or rippled; 

 middle cardinal tooth stout, the other 

 slender. 



PITAR FULMINATA Menke. Normally white 

 with zigzag painting of bright yellow under 

 a chalky epidermis; a purple spot close to 

 umbones. Length 30 mm. 



PI. 19, Fig. 3 



PI. 20, Fig. 3 



Cape Hatteras, North Carolina to 



West Indies; Brazil 



PITAR MORRHUANA Gould. Shell thin, chalky, 

 concentrically striated; pallial sinus very 

 indistinct; lunule feeble, not impressed. 

 Length 2 inches. 



PI. 20, Fig. 4 



Prince Edward Island to Cape Hat- 

 teras, North Carolina 



PITAR SIMPSONI Dall. Shell trigonal, rath- 

 er solid, painted with brown outside and 

 purple within. Occasionally it is pure 

 white. Range 0-26 fathoms in Tampa and 



