Atrypa

1 definition found

From The Collaborative International Dictionary of English v.0.48 [gcide]:

  Atrypa \A*try"pa\, n. [NL., fr. Gr. 'a priv. + ? a hole.]
     (Paleon.)
     A extinct genus of Branchiopoda, very common in Silurian
     limestones.
     [1913 Webster]