Plate 22. 



Fig. 1. I'crscijliojiastcr toinis; type, abactinal view, p. 121. 



2. Perscphonastcr sulucnsis ; type, abactinal view, p. 125. 



3. Perseplionaster ocdiplax ; type, ahactinal vi(nv, p. 127. 



4. Same ; a smaller specimen. 



569 



