Hippurite
Hippurite , noun
[Greek {not transcribed} decked with a horse's tail; "i`ppos horse + {not transcribed} tail: compare French hippurite.]
(Paleontology) A fossil bivalve mollusk of the genus Hippurites, of many species, having a conical, cup-shaped under valve, with a flattish upper valve or lid. Hippurites are found only in the Cretaceous rocks.