6 University of Michigan 
FUSCONAIA UNDATA (Barnes), 1823 
Type locality: Wisconsin and Fox rivers. 
Unio undatus Barnes, ’23, p. 121, pl. 4, f. 4. 
U. undatus Barnes = U. mytiloides Raf., ’20, Lea, ’29, p. 418. 
U. ‘tragonus Lea; “31,4p: 110, pl. 16,4: Ao. 
U. obliqua Lam. ’19 = undatus Bar., Lea, ’34, p. 88 (type of Lam. 
examined). 
U. undatus Bar.=U. trigonus Lea, Conrad, 34, p. 72; Ferussac, 
35, PB. 28: 
Quadr. obliqua Lam. = U. undatus Bar., Simpson, ’o00¢, 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) pps 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 Pleurobema 
cordatum. 
The question whether undata is a good species or a variety 
of flava does not affect the validity of either name. 
FusconaiaA cor: (Conrad), 1834 
Wniocor Conrad), 34, p: 26a plage nea S: 
Unio cor Con.=U. edgarianus Lea=U. tuscumbiensis Lea ’71 
= U. andersonensis Lea, Frierson, 16*, p. 102, pl. 3, figs. I-2 3 (sup: 
posed type figured). 
Fusconaia cor (Con.) = U. edgarianus Lea =U. obuncus Lea = U. 
andersonensis Lea, Ortmann, "18, p. 532. 
Pleurobema cor (Con.) “possibly =U. edgarianus Lea or some 
other species of that group,” Walker, ‘18¢, p. 172. 
“The supposed synonyms Unio mytilloides Con., Unio crapu- 
lus Lea and U. lewisti Lea are to be deleted, all being distinct 
from the type of U. cor. 
