PLATE XVI. 

 Pentacuinus macleaeanus, Wyv. Thorns. 



Diam. Tagc 



Fig. 1. Tli(^ entire specimen, . . . . . . x 2 312 



Fig. 2. The end of a pinnule ; from the side, . . . . x 12 55 



Fig. 3. Yi'ntral aspect of the basal joints of a piiinnh'. slioAving the 



development of its amlndaeral skeleton, . . . x 12 80 



