36 University of Michigan 



men of unusual diameter, and to either discredit his locality 

 or grant a considerable extension of the known range of spe- 

 cies. Adding to this, there is no figure and the type is lost. 

 On the whole, it appears that Lasmigona siibviridis (Con.) 

 should stand and U. znridis Raf. go into the discard." (H. 

 A. P.) 



Lasmigona (Alasminota) holstonia (Lea), 1838 



Type locality: Holston River. 



Alasmodon {Stilcularia) badium Rafinesque, '31, p. 5. 



Margaritana holstonia Lea, '27, p. 42, pi. 14, f. 2,7. 



Alasmidonta holstonia (Lea), Simpson, '14, p. 502. 



Alasmodon badium Raf. ::= il/arc/. holstonia Lea, Frierson, '14", p. 7. 



Symphynota (Alasminota) holstonia (Lea), Ortmann, '14, p. 43. 



Lasmigona (Sulcularia) badia (Raf.), Ortmann, '18, p. 557. 



From the original description of Al. badium we cannot be 

 sure that M. holstonia Lea was intended. The term "obtuse" 

 used for the cardinal tooth suggests also Alasmidonta minor 

 (Lea), as in holstonia the teeth are generally rather sharp. 

 Other characters of the shell are very indefinite and do not 

 furnish any positive indication of the species. 



Thus Al. badium is not identifiable, and with the specific 

 the subgeneric name {Sulcularia) also should be discarded. 



Lasmigona (Lasmigona) costata (Rafinesque), 1820 

 Type locality: Kentucky River. 



Alasmidonta costata Rafinesque, '20, p. 318, pi. 82, f. 15-16 



Alasmodonia rugosa Barnes, '22,, p. 278, pi. 13, f. 21. 



Lasmigona costata Raf., Rafinesque, '31, p. 5. 



Alasmodonta costata Raf. = ^. rugosa Bar., Conrad, '34, p. 72; 

 Ferussac, '35, p. 25. 



Symphynota (Lasmigona) costata (Raf.), Simpson, '00, p. 665; '14, 

 p. 488. 



Lasmigona costata (Raf.), Frierson, '14^", p. 40. 



There is no doubt about this species. The original descrip- 

 tion and figure distinctly indicate the chief characters of it. 



