I086 PSKUDODON 



Margaritana vondemhiischiana Lea, Pr. Am. Phil, Soc. 1, 

 1840, p. 288; Tr. Am. Phil. Soc, VIII, 1842, p. 222, pi. 

 xviii, fig. 39; Obs., Ill, 1842, p. 60, pi. xvin, fig. 39, — 

 KusTKR, Conch. Cab. L'nio, 1862, p. 295, pi. xcviii, fig. 3. 



Margaron ( M onocondyUcaJ I'ondcmbuschiana Lea^ Syn., 1852, 

 p. 45 ; 1870, p. 73. 



Monocondylcca voridembiischiano H. and A. Adams, Gen. Rec. 

 Moll., li, 1858, p. 501. 



Pseudodon vondemhuschiana Conrad, Am. Jl. Conch., I, 1865, 



P- ^2>Z- 

 Pseudodon z'ondeuibuschianus Simpson, Syn., 1900, p. 836. 

 Monodontina hv.schiana Conrad, Pr. Ac. N. Sci. Phila., VI^ 



185.3. PP- 269, 449. 

 Unio von buschea Sowerby, Conch. Icon., XVI, 1866, pi. li, 



fig. 269. 

 Alasmodonta crispata Mousson, L. and W. Moll. Java, 1849, 



p. 97, pi. xyi\], figs. I, 2. 

 Margaritana crispata P^Tel, Conch. Sam., Ill, 1890, p. 173. 

 Monocondylcea planulata Lea, Pr. Ac. N. Sci. Phila.. XI, 1859. 



p. 187; Jl. Ac. N. Sci. Phila., IV, 1859, p. 262, pi. xlii, fig. 



142; Obs., VII, i860, p. 80, pi. XLII, fig. 142. — PKUSTER, 



Conch. Cab. Unio, 1862, p. 305. pi. c, fig. 8. 

 Pseudodon planulata Conrad, Am. Jl. Conch., I, 1865, p. 233. 

 Margaron (Monocondylcea) planulata Le.\, Syn., 1870, p. 73. 

 Microcoudylcca planulata P.ETel, Conch. Sam., Ill, 1890, p. 



175- 

 Margaritana fragilis Kuster, Conch. Cab. Unio, 1862, p. 295, 



pi. xcviri, fig. 2. 

 Microcondylcea fragilis P.^STel, Conch. Sam., Ill, 1890, p. 175. 

 Monocondylcea rhomboidea KusTER, Conch. Cab. Unio, 1862, p. 



304, pi. c, fig. 7. 



This species grows larger than the measurements given, 

 which are from the type. All the specimens I have seen have 

 a smoky epidermis. 



Pseudodon ellipticus Conrad. 



Shell almost elliptical, inclining a little towards being rhom- 

 boid, scarcely subsolid, convex, inequilateral ; beaks not prom- 

 inent : posterior ridge inclined to be double, ending at and 



