rhipidoglossa

from The Century Dictionary.

• Rhipidoglossate mollusks; a large group, variously called order, suborder, or division, of prosobranchiate gastropods, characterized by a heart with two auricles and a ventricle, and teeth of the odontophore in many marginal rows; the other teeth are generally a median, several admedian, and numerous marginal on each side.

from the GNU version of the Collaborative International Dictionary of English.

• noun plural (Zoöl.) A division of gastropod mollusks having a large number of long, divergent, hooklike, lingual teeth in each transverse row. It includes the scutibranchs. See Illustration in Appendix.