6 University of Michigan 



FuscoNAiA UNDATA (Banies), 1823 

 Type locality: Wisconsin and Fox rivers. 



Unio undatiis Barnes. '23, p. 121, pi. 4, f. 4. 



U. undatus Barnes = U. mytiloides Raf., '20, Lea, '29. p. 418. 



U. trigonus Lea, '31, p. 1 10, pi. 16, f. 40. 



U. obliqua Lam. 'ig^^ undatus Bar., Lea, '34, p. 88 (type of Lam. 

 examined). 



U. undatus Bar. = 17. trigonus Lea, Conrad, 34, p. 72; Ferussac, 

 '35, P- 28. 



Quadr. obliqua Lam. = U. undatus Bar., Simpson, '00^, p. 788. 



U. undatus Bar. = U. trigonus Lea, Walker, '10", p. 24. 



Quadrula undata (Bar.) ^U. trigonus Lea, Simpson, '14, p. 880. 



Fusconaia undata (Bar.) and F. undata trigona (Lea), Utterback 

 '16, pp. 22, 24. 



Walker has positively shown that original description and 

 figure of Barnes can be referred only to U. trigonus Lea, an 

 opinon already held by Conrad and Ferussac. 



In that connection, however, Walker (p. 17) points out that 

 possibly trigonus may be a variety of undatus, an idea taken 

 up by Utterback. 



The identification of the type of obliqua Lam. as undatus 

 Bar. by Lea is obviously incorrect. See also under Pleurnbeuia 

 cordatum. 



The question whether undata is a good species or a variety 

 of flava does not affect the validity of either name. 



Fusconaia cor (Conrad), 1834 



Unio cor Conrad, '34, p. 28, pi. 3, fig. 3. 



Unio cor Con. =-- U . cdyarianus Lea ;= U . tuscunibiensis Lea '71 

 = U. andcrson'cnsis Lea. Frierson, '16", p. 102, pi. 3. figs. 1-2 3 (sup- 

 posed type figured). 



Fusconaia cor (Con.)=:f7. cdgarianus hta^U. obuncns Lea = [7. 

 andersonensis Lea, Ortmann, '18, p. 532. 



Plettrobema cor (Con.) "possibly := L^ cdgarianus Lea or some 

 other species of that group," Walker, '18^, p. 172. 



"The supposed synonyms Unio mytilloides Con., Unio crapii- 

 liis Lea and U. lewisii Lea are to be deleted, all being distinct 

 from the type of U. cor. 



