14 CATALOGUE FAMILY 



t Anodontai tetrar^ona, Lea. 



(Trans. Am. Phil. Soc., ::n<l Series. Vol. X, PI. VIII, Fig. 25.) 



"Alexandria, Louisiana/' A member of the group typified by Ano. edentnla 

 Say, to which it is- closely related. 



J Anodonta Tirens, Lea. 



(Trans. Am. Phil. Soc., 2d S: ries, Vol. X, PI. XXVIII, Fig. 53.) 

 Ked River, Louisiana, near Alexandria* Synonymous with Ano. linniniuu . 

 Lea, which see. 



f Anodonta wardiana, Lea. 



(Trans. Am. Phil. Soc., Vol. VI, PI. XIV, Fig-. 42.) 



Scioto river, Ohio, and White river, Indianapolis, Indiana. Synonymous witfo 

 Ano. pavonia, Lea. whieh eonsult. 



GENUS MARGARITANA, 



Gills generally free from the abdominal #ac T mid their posterior 

 ity not united to the mantle; anal openinr not fringed, branchial mostly 

 fringed. 



Shell transverse, oblong, equivalve, covered with an olivaceous epidennix. 

 Hinge with a single cardinal tooth in the right valve, broad, erect, and 

 grooved at its apex; twin teeth of left valve strong, the hinder denticulated* 

 the front narrower, entire, pointed; lateral tef,th not developed. (II. & A, 

 Adams. ) 



* Margaritana calceola. Lea. 



(Trans. Am, Phil, Soc., Vol. Ill, PI. Ill, Fiji-, 1, MS Unto calcfiithi*.) 

 Ranges from Ohio to Iowa and north to Michigan. It varies but little through- 

 out its limits of distribution. It is most abundant in creeks, rather than in 

 rivers, in which respect it simulates the habit of Marg. hildrelhiama, Lea. c<il- 

 ceola is the type of a group which includes M. deltoldea, M. minor, and M. 

 quadrata, all of which are believed to be synonymous with it. 



CATALOGUE G. 



