

PLATE III. 



Fig. 17, \~a. Paracyathus pruinosus. X 2. 



Fig. 18, iSrt. Citharocyathus conicus. ■ 4. 



Fig. 19, 19^. Citharocyathus venustus. X 4. 



Fig. 20, 2cw, 20/;. Odontocyathus sexradiis : natural size. 



Fig. 21, 2iff, 21/;. Odontocyathus stella. X 2. 



Fig. 22, 22a. Stephanotrochus weberianus : natural size. 



Fig. 23, 23a. Stephanotrochus Sibogee : natura! size. 



