This species is dedicated to Prof. W. H. Brewer, Botanist to the Survey.
Clypeaster Lamark.
C. Gabbii Rém.
Disk rather small, comparatively thick, varying from circular to sub-pentagonal and irregular sub-oval.
Apex nearly central, sub-elevated; margin rounded; genital apparatus sub-angular.
Ambulacral star almost symmetrical; petals about equal in length, elongated, open at their extremities.
Inferior surface flat near the edge, and gently concave in the center.
Mouth depressed, sub-central.
Ambulacral furrows straight, slightly marked.
Anal aperture very small, marginal.