Occasional Papers of the Museum of Zoology 13 



Amp.lKma plicata (Say), 1817 



Type locality: Lake Erie. 



Unto plicata Say, '17. 



U. pUcatus Say=L'. rariplicata Lam. ('19), Barnes, '2;^, p. 120; 

 Ferussac, '35, p. 27. 



U. plicatus Say= L'. peruvianus Lam. ('19), Conrad, '34, p. 71. 

 U. hippopaus Lea, '35, p. 163; '48, p. 67, pi. i, f. i. 

 Quadrula plicata hippopcea (Lea), Simpson, '14, p. 816. 

 Amblema plicata (Say) =U. hippopceus Lea, Utterback, '16, p. 2>2,- 

 U. plicatus Say = U. hippopmis Lea, Ortmann, '18, p. 539. 



Of all the "plicate" forms {Amhlcma), 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 hippopccus 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 pcruz'iana Lamarck, '19. p. 7i,citing Encyclopedie, pi. 248, fig. 7. 

 Unio plicatus Barnes (not Say), '23, p. 120. 



U. plicatus Say, '17 = L". peruviana Lam., Conrad, "34, p. 71; Lea^ 

 '34, p. 87 (type examined) ; Ferussac, '35, p. 27. 

 Quadrula plicata (Say), Simpson, '14, p. 814. 

 Amblema peruviana (Lam.), Utterback, '16, p. 33. 

 Quadrula peruviana (Lam.), Walker, 'i8e, p. 168. 



A "plicate" species, the original description of which calls 

 the beaks swollen (unibonibus 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 Encyclopedie, 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). 



