Here is a list of papers that include freshwater mollusks from either
Panama or Honduras:
 
Coney, C.C., and A. Lopez.  1992.  Comparative anatomy of Mycetopoda and
Anodontites (Mycetopodidae) from Central America with Mutella (Mutellidae)
from East Africa.  Western Society of Malacologists.  Annual Report.
24:30-31.
Dunker, W.  1858.  Einige neue species der naiaden.  Malakozoologische
Blätter  5:225-229.
Lea, I.  1858.  Description of four new fresh-water molluscs, from the
Isthmus of Darien and Honduras.  Proceedings of the Academy of Natural
Sciences of Philadelphia  10:118.
Lea, I.  1859.  Description of a new species of Unio from the Isthmus of
Darien.  Proceedings of the Academy of Natural Sciences of Philadelphia
11:281.
Lea, I.  1859.  Descriptions of twenty-one new species of exotic Unionidae.
Proceedings of the Academy of Natural Sciences of Philadelphia  11:151-154.
Lea, I.  1860.  Descriptions of exotic Unionidae.  Journal of the Academy
of Natural Sciences of Philadelphia  4(second series)3(7):235-271 + 13
plates.
Tryon, G.W.  1863.  Descriptions of two new species of fresh water
mollusca, from Panama.  Proceedings of the Academy of Natural Sciences of
Philadelphia  15:146.
von Martens, E.  1900.  Biologia Centrali-Americana.  Land and freshwater
Mollusca.    xxviii + 675 pp. (pp. 478-540)
Zetek, J.  1918.  Los moluscos de la República de Panamá.  Privately
printed  69 pp.
Zetek, J.  1918.  Los moluscos de la República de Panamá.  Revista Nueva
5(2-6):509-575.
 
Kevin S. Cummings
Illinois Natural History Survey
607 E. Peabody Drive
Champaign, IL 61820
217/333-1623
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http://www.inhs.uiuc.edu/cbd/collections/mollusk.html