Pease's Nudibranch is a elongate with many parallel white longitudinal lines. The body colour is a light cream to peach. On the notum may be variable blue-black spots. The mantle margin and the foot edge is a deep blue or violett. The rhinophores are white with two orange bands. The gills are white with orange on the outer surface.
This species can be found often in groups. Hypselodoris peasei feeds exclusively on a yellow sponge genuas Luffariella .
The white egg masses are typically consist of about two whorls.