Holocephala

from The Collaborative International Dictionary of English v.0.48

Holocephali \Hol`o*ceph"a*li\, n. pl. [NL., from Gr. "o`los
   whole + kefalh` head.] (Zool.)
   An order of elasmobranch fishes, including, among living
   species, only the chim[ae]ras; -- called also {Holocephala}.
   See {Chim[ae]ra}; also Illustration in Appendix.
   [1913 Webster]