Occasional Papers of the Museum of Zoology 13 
AMBLEMA PLICATA (Say), 1817 
Type locality: Lake Erie. 
Unio plicata Say, ’17. 
U. plicatus Say = U. rariplicata Lam. (’19), Barnes, ’23, p. 120; 
Ferussac, ’35, p. 27. 
U. plicatus Say = U. peruvianus Lam. (’19), Conrad, ’34, p. 71. 
U. hippopeus Lea, ’35, p. 163; ’48, p. 67, pl. 1, f. 1. 
Quadrula plicata hippopea (Lea), Simpson, ’14, p. 816. 
Amblema plicata (Say) =U. hippopeus Lea, Utterback, ’16, p. 33- 
U. plicatus Say =U. hippopeus Lea, Ortmann, ’18, p. 530. 
Of all the “plicate” forms (Amblema), only one is found 
in Lake Erie, from which locality Say’s species was originally 
reported. Thus, this name must be used for the Lake Erie 
form, which is the hippopeus of Lea. It cannot be used for 
the form with greatly swollen beaks found in the large rivers 
of the interior basin (peruviana, which see). 
AMBLEMA PERUVIANA (Lamarck), 1819 
Type locality: Erroneously given as Peru. 
Unio peruviana Lamarck, ’19, p. 71,citing Encyclopédie, pl. 248, fig. 7. 
Unto plicatus Barnes (not Say), ’23, p. 120. 
U. plicatus Say, 717 =U. peruviana Lam., Conrad, 34, p. 71; Lea, 
’34, p. 87 (type examined) ; Ferussac, 735, p. 27. 
Ouadrula plicata (Say), Simpson, ’14, p. 814. 
Amblema peruviana (Lam.), Utterback, ’16, p. 33. 
Quadrula peruviana (l,am.), Walker, ’18¢, p. 168. 
A “plicate” species, the original description of which calls 
the beaks swollen (umbonibus tumidis). This is the most 
prominent character of it, and plainly indicates the form which 
has been called U. plicatus by subsequent authors, but it is not 
the real A. plicata from Lake Erie. 
Lamarck cites the figure in the Encyclopédie, which is an 
excellent one and leaves no doubt as to the form described. 
Frierson (16°, p. 62) says that peruviana “almost certainly” 
is heros Say, but the character of the beaks and the figure pre- 
cludes this (see under Megalonais gigantea). 
