PLATE III. 



Fi&- i7i 1 7^- Paracyathus pruinosus. X 2. 



Fig. 18, iSa. Citharocyathus conicus. X 4. 



Fig. 19, iga. Citharocyathus venustus. x 4. 



Fig. 20, 20«, 20<^. Odontocyathus sexradiis : iiahiral size. 



Fig. 21, 2irt, 2\b. Odontocyathus Stella. X 2. 



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



Fig. 23, 23ff. Stephanotrochus Sibogse : nattiral size. 



