PLATE XIII. 



PAGE 



Figs. 1-4. Rcgadrella phcenix, 0. Schmidt, . . 84 



Fig. 1. Fragment of the upper part, with sieve-plate, from a dried specimen; 

 natural size. 



Fig. 2. Hypodermal hexact ; x 20. 



Fig. 3. Discohexaster ; x 450. 



Fig. 4. Floricome ; x 450. 



Figs. 5-7. Eiqylc'ctella crassistellata,¥. E. S., . . 81 



Fig. 5. Section at right angles through the lateral wall of a fragment oi Euplcctella 

 crassistellata, F. E. S., preserved in alcohol, with the soft parts ; x 100. 



Fig. 6. Oxyhexaster with thick and long principal rays ; x 450. 



Fig. 7. Inferior portion of an anchor-like diact, with hemis])herical, rounded, six- 

 toothed extremity ; x 300. 



