鞍状壳; 垂体窝
Ephippium \E*phip"pi*um\, n. [L., saddle cloth, fr. Gr. ?; 'epi` on + ? horse.] 1. (Anat.) A depression in the sphenoid bone; the pituitary fossa. 2. (Zo["o]l.) A saddle-shaped cavity to contain the winter eggs, situated on the back of Cladocera.