Plate 6. 



Fig. 1. Bathydorris levis spinosus. From a photograph ; \. 



2. " " " Autogastral hexact ; x 300. 



3. Farrea occa claviformis. From a photograph ; \. 



4. Staurocalyptus, ttj). Irregular discoctaster ; x 300. 



5. " " Paratropal, paratangential rays of prostal pentact; from 



above ; x 100. 



6. Staurocalyptus, sp. From a photograph ; \. 



7. " " Part of a paratropal ray of prostal pentact ; x 400. 



8. " " Discoctaster with two accessory rays ; x 300. 



9. " " Oxyhexaster ; x 600. 



10. " " Discoctaster; centrum and three rays; x 450. 



11. Farrea occa claviformis. Uncinate ; the two ends of same spicule ; x 450. 



12. " " " Gastral clavula ; from above ; x 450. 



13. " " " Gastral clavula ; lateral view ; x 450. 



14. " " " Gastral clavula ; lateral view; x 450. 



