acalephs

from The Collaborative International Dictionary of English v.0.48

Acaleph \Ac"a*leph\, Acalephan \Ac`a*le"phan\n.; pl. {Acalephs},
   {Acalephans}. [See {Acaleph[ae]}.] (Zool.)
   One of the Acaleph[ae].
   [1913 Webster]