﻿474 iTvCiAS 



Miiri^aritcuia fabula L,^.\, 'JV. Am. I'hil. Soc., VI, 1838, p. 44, 

 pi. XIII, fig. 39; Obs., II, 1838, p. 44, pi. XIII, fig. 39. — Kus- 

 TEK, Conch. Cab. Unio, 1862, p. 301, pi. c, fig. 3. 



Unio fabula Hanley, Biv. Shells, 1843, p. 213, pi. xxii, fig. 45. 

 — SowuRDY, Conch. Icon., X\'I, 1868, pi. i^xxvi, fig. 394. 



Margaron (Margaritana) fabula Lea, Syn., 1852, p. 44; 1870. 

 p. 70. 



Micromya fabula Agassiz, Arch, fiir Nat., I, 1852, p. 47. 



Strophitus fabula Conrad, I^r. Ac. Xat. Sci. Phila., VI, 1853, 

 p. 263. 



Baphia fabula H. and A. Adams, Gen. Rec. Moll., II, 1857, p. 



■ 499- 



Pegias fabula Simpson, Syn., 1900, p. 661. 



Margaritana curreyana Lea, Pr. Ac. Nat. Sci. Phila., I, 1840, 



p. 288; Tr. Am. Phil. Soc, VIII, 1842, p. 223, pi. xviii, fig. 



40; Obs., Ill, 1842, p. 61, pi. xviii, fig. 40. — KusTER, Conch. 



Cab. Unio, 1862, p. 300, pi. c, fig. 2. 

 Micromya curreyana Agassiz, Arch, fiir Nat. I, 1852, p. 47. 

 Margaron (Margaritana) curreyana Lea, Syn., 1852, p. 42; 



tS/o, p. 68. 

 Strophitus curreyana Conrad, Pr. Ac. N. Sci., Phila., VI, 1853, 



p. 263. 

 Baphia curreyana II. and A. Adams, Gen. Rec. Moll., II, 1857, 



P- 499- 

 Unio curreyana v'^owerbv. Conch. Icon., XVI. 1868, pi. lxiii, 



fig. 319. 

 Unio currcyanus Hanley, P)iv. Shells, 1856, p. 386. pi. xxiy, 



fig. 10. 

 Margaritana correyana P.iiTEr., Conch. Sam., III. i8()o, p. 173. 



A remarkable form, which seems to be related to some of 

 the Alasmidontas, but differs from all of them in a number of 

 characters. Its texture and epidermis are unlike any species 

 that I know of. Usually much of the epidermis is decorticated, 

 even in young shells, leaving a grayish or ashy surface exposed. 

 It often remains in the sinus near the base in front of the 

 posterior ridge, where it shows a very wide dark ray or blotch, 

 and when present on the posterior end it quite commonly shows 



