﻿242 I'll SI'.moCONCIIA 



Anodon c.vilis Catlovv and RuEVii, Conch. Noni., 1845, P- ^■ 

 Margaron (Anodonta) exilis Lka, Syn., 1852, p. 51 ; 1870, p. 



82. 

 MonocondyUca exilis PyivTiCL, Conch. Sam., Ill, 1890, p. 174. 

 Pilsbryconcha exilis Simi'Son. Syn., kjoo, p. 587. 

 Anodonta siliqita Kus'i'kk. Conch. Cah. Ano., 1852, p. 57, pi. 



XIV, fig. 5. 

 Anodonta polita Mousson, L. and Suss. Moll. Java, 1849, P- 



98, pi. XIX, figs. 2, 3. 

 Margaron (Anodonta) polita LiiA, Syn., 1852, p. 53. 

 Anodon politiis Sowerby, Conch. Icon., XYII, 1867, pi. xii, 



fig- 36. 



Monocondylcca compressa Lea, Pr. Ac. N. Sci. Phila., VII» 

 1863, p. 190; Jl. Ac. N. Sci. Phila., VI, 1866, p. 30, pi. xi, 

 fig. 29; Obs.. XI, 1867, p. 34, pi. XI, fig. 29. — Ci.ESSiN, 

 Conch. Cab. Ano.., 1876, p. 258, pi. i.xxx, figs. 3, 4. 



Pseudodon compressa Conkah. Am. Jl. Conch.. I, 1865, p. 233. 



Margaron (Monocondylcca) compressa Lea, Syn., 1870, p. 73. 



Spatha compressa P^etel, Conch. Sam., Ill, 1890, p. 188. 



Anodon jai'ana Sowekby, Conch. Icon., X\'II, 1867, P'- ^^> fig- 



Anodon gracilis Soweri'-y? Conch. Icon.. X\II, 1867, pi. xix, 



fig. 45- 

 Anodon kelletti Sovverhy? Conch. Icon.. X\II, 1867, pi. xix,. 



fig. 71. 

 Anodonta sempervirens Deshayes, Nouv. Arch, de Miis., X^ 



1874, p. 120, pi. V, figs. 4, 5. 



An exceedingly delicate shell, which does not vary remark- 

 ably, yet it has received a large numiber of names. There is 

 often an especially rich, greenish, iridescent, concentric band 

 near the border inside. 



PiLSERYOcoNCHA EXPRESSA (von MartcnsL 



"vShell compressed, elliiUic-ovate, well rounded in front, ob- 

 tusely alate behind, posterior margin obliciue, ventral margin 

 straight to the middle, roundly expanded posteriorly ; epider- 

 mis concentrically striate, shining : beaks depressed, with un- 



