1854.] 



245 



Unio pliciferus Lea. Dated by Mr. Conrad, 183S <; 



I 



Margaritana arcula Lea. Dated by Mr. Conrad, 1838 < 



Unio discus Lea. Dated by Mr. Conrad, 1838 



" Dorfeuillianus Lea. Dated by Mr. Conrad, 1838 ^ 

 " Menkeanus Lea. " " 1838 



I 



Unio Rangianus Lea. Dated by Mr. Conrad, 1838 < 



Published in Memoir 

 read before and depo- 

 sited with the Amer. 

 Phil. Soc, July 15th, 

 1836, and printed in 

 Trans. Vol. 6. Issued 

 in Synopsis, 1836. 



Published in Memoir 

 read before and depo- 

 sited with the Amer. 

 Phil. Soc., Aug. 19th, 

 1836, and printed in 

 Trans. Vol. 6. Issued 

 in Synopsis, 1836. 



Published in Memoir 

 read before and depo- 

 sited with the Amer. 

 Phil. Soc, Nov. 4th, 



1836, and printed in 

 Trans. Vol. 6. Issued 

 in Synopsis, 1836. 



Published in Memoir 

 read before and depo- 

 sited with the Amer. 

 Phil. Soc. July 21st, 



1837, and printed in 

 Trans. Vol. 6. Issued 

 in Synopsis, 1836. 



Published in Memoir 

 read before and depo- 

 sited with the Amer. 

 Phil. Soc, Oct. 2d, 

 1840. Oct. 16th or- 

 dered to be printed. 

 Issued in the Proceed- 

 ings of that month, 

 (No. 13, p. 285,) which 

 was laid on the table 

 by the Reporter, Nov. 

 6th, 1840. Printed in 

 the Trans. Vol. 8, p. 

 191. 



* It will be observed that Mr. Conrad continues the singular error of fre- 

 quently dating my species of the same memoir in different years, while some of 

 them in the same memoir he inserts without a date, viz. : Stonensis, subangu- 

 latusy obesusy &c 



