Plate 64. 



1-8. Arseosoma bicolor A. Ag. and CI. 



1. Dactylous pedicellaria. X 70. 



2. Large tridentate pedicellaria. X 30. 



3. Triphyllous pedicellaria. X 70. 



4. Valve of dactylous pedicellaria. X 70. 



5. Valve of large tridentate pedicellaria. X 70. 



6. Tip of valve of large tridentate pedicellaria. X 150. 



7. Valve of small tridentate pedicellaria. X 70. 



8. Valve of triphyllous pedicellaria. x 70. 



9-12. Sperosoma giganteum A. Ag. and CL 



9. Large tridentate pedicellaria. X 70. 



10. Varve of large tridentate pedicellaria. X 70. 



11. Valve of small tridentate pedicellaria. X 70. 



12. Valve of triphyllous pedicellaria. X 70. 



