PLATE 43. 



POKODISCIDA. 



Diam. Page 



Fig. 1. Rhopalastrum malleus, n. sp., . . . . x 100 527 



Fig. 2. Rhopalastrum ypsilinum, n. sp., . . . . x 50 528 



Fig. 3. Rhopalastrum hexaceros, n. sp., . . x 100 529 



Fig. 4. Rhopalastrum tnceros, n. sp., . . . . x 50 529 



Fig. 5. Rhopalastrum trispinosum,i\. sp. (vel Dictyastrum trispinosum), x 150 525 



Fig. 6. Rhopalastrum arcticum, n. sp., . . . . x 300 529 



Fig. 7. Rhopalastrum hexagonum, n. sp. (velDictyastrumhexagonum), x 100 525 



Fig. 8. Rhopalastrum irregulare, n. sp., . . . . x 100 528 



Fig. 9. Euchitonia lanceolata, n. sp., . x 80 534 



Fig. 10. Euchitonia carcinus, n. sp., . . . . x 300 535 



Fig. 11. Euchitonia echinata, n. sp., . . . . x 120 536 



Fig. 12. Euchitonia stohrii, n. sp., . . . . . x 100 534 



Fig. 13. Hymeniastrumeuclidis,n.sp., . . . x 200 531 



Fig. 14. Chitonastrum jugatum, n. sp., . x 200 537 



Fig. 15. Chitonastrum lyra, n. sp., . . . . . x 500 538 



A living specimen observed. The entire shell is enveloped by the calymma 

 and surrounded by radiating pseudopodia (drawn much too short). 

 Between the two paired arms arises a large " sarcode-flagellum." The 

 central chamber and the first enveloping ring are filled by the clear 

 nucleus; the other rings and all the chambers of the arms contain 

 numerous pink oil-globules. 



Fig. 16. Tngonastrum regulare, n. sp. (vel Chitonastrum regulare), . x 200 539 



