PLATE XXX. 



Cassidulus micrococcus Gabb (page 69). 



Fig. la. Upper surface of the test. 



lb. Lower surface of the test. 



Ic. Lateral view of the same. 



Id. Posterior view of the same. 



le. Anterior ambulacrum at the base of the petaloidal region. 



If. Several plates in petaloidal region of anterior ambulacrum, much enlarged. 



1^. Oral portion of an ambulacral axea. 



Ih. Apical disk, enlarged, 



li. Surface of an interambulacral plate, highly magnified. 



164 



