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Zoological Society 



interspaces between the ribs are thin, calcareous, prominent exter- 

 nally, and pierced with numerous perforations. The cavity of the 

 cells is filled with a fleshy sponge-like body, strengthened by nume- 



Carpenteria. 



Fig. 1. 



Fig. 2. 



Fig. 1. Exterior surface complete. 



Fig. 2. Partly eaten off by acid. a. Complete. 



Fig. 4. 



Fig. 3. 



Fig. 3. Cross sunken cells, showing the spicula in the cells. 



Fig. 4. Part of Fig. 3, more magnified, a. Outer parietes of cells. 



rous minute, simple, pin- shaped and fusiform smooth spicula placed 

 in bundles. 



