(20) 



EXPLANATION OF PLATE I. 



POLYZOA AND ECHINOIDEA FROM THE UPPER CRETACEOUS OF NEED'S CAMP, 

 BUFFALO RIVER, CAPE COLONY. 



1. Filisparxa rainosa, d'Orbigny. x 12. Obverse face of part of a zoarium, 



showing tendency of apertures to be arranged in V-shaped rows (p. 408). 



2. Filisparsa fraqilis, Marsson. x 12. Obverse face of part of a zoarium 



(p. 408). 



3. Diastopora compressa (Goldfuss). x 12. A young zoarium, showing the first- 



formed zocecia to be slightly emergent, while the more distal are im- 

 mersed (p. 409). 



4. Idmonea virgula, d'Orbigny. x 12. Obverse face of zoarium (p. 410). 



5. Crisina cenoniunn, d'Orbigny. x 12. Obverse face of a specimen resembling 



d'Orbigny's figure of Idmonea calypso, showing strongly-marked zooecial 

 boundaries (p. 411). 



6. Crisina excavata (d'Orbigny). x 12. Obverse face of part of a zoarium. 



In the proximal part the lateral series of apertures of each side are 

 practically opposite, and so appear to form continuous bands across 

 the zoarium. Distally is a front view of the right-hand series only, and 

 those of the left-hand are seen in profile (p. 412). 



7. Crisina mnnjinata (d'Orbigny). x 12. Obverse face of part of a zoarium viewed 



rather from the right side, so that only the edges of the left-hand series 

 of apertures appear ; the alternate arrangement of the series of apertures 

 is therefore not obvious in the figure (p. 412). 



8. Tervia dorsata (von Hagenow). x 12. Obverse face of part of a zoarium 



(p. 413). 



9. Tervia yibbera, Gregory, x 12. Obverse face of part of a zoarium viewed 



from the left-hand side. The end of a " dorsal process " appears at the 

 top left-hand side of the figure, springing distally from the reverse face 

 (p. 413). 



10. Entalophora virgula (von Hagenow). x 12. Part of a zoarium (p. 414). 



11. Entalophora conjugata (von Reuss). x 12. Part of a zoarium. Some of the 



apertures appear to be arranged in whorls or spirals ; but these are only 

 rows of three, and the series do not continue on the half of the branch 

 not shown (p. 415). 



12. Entalophora echinata (Romer). x 12. Part of a worn zoarium (p. 415). 



13. Spiropora verticillata (Goldfuss). x 12. Part of a zoarium (p. 417). 



14. Entalophora madraporacea (Goldfuss). x 12. Part of a worn zoarium 



(p. 416). 

 15-17. Coptosoma capense, sp. nov. Natural size. (p. 419). 



