PLATE 43. 



PORODISCIDA. 



Fig. 1. Rhopalastrum malleus, n. sp., 



Fig. 2. Rhopalastrum ypsilinum, n. sp.. 



Fig. 3. Rhopalastrum hexaceros, n. sp., 



Fig. 4. Rhopalastrum triceros, n. sp., 



Fig. 5. Rhopalastrum trispinosum,n. sp. (vel Dictyastr 



Fig. 6. Rhopalastrum arcticum, n. sp., 



Fig. 7. Rhopalastrum hexagonum, n. sp. (vel Dictyast 



Fig. 8. Rhopalastrum irregulare, n. sp., 



Fig. 9. Euchitonia lanceolata, n. sp., . 



Fig. 10. Euchitonia carcinus, n. sp., . 



Fig. 11. Euchitonia echinata, n. sp., 



Fig. 12. Euchitonia stohrii, n. sp., 



Fig. 13. Hymeniastrum euclidis, n. sp., 



Fig. 14. Chitonastrum jugatum, n. sp., 



Fig. 15. Chitonastrum lyra, n. sp., 



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-rlagellum." 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. 







Diam. 



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527 





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um trispinosum), 



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*um hexagonum), 



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531 





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537 





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538 



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



