PLATE III. 



Fig. 1. Diagram representing a section cut through the middle of the pyri- 

 tized specimen of Receptaculites infundihuliformis. X4. 



Fig. 2. A portion of the outer surface of the same specimen, showing rhom- 

 bic pits, radial tubes, and projecting spines. X 8. 



Fig. 3. R. infundihuliformis. The inner surface of the gastral wall, showing 

 the broken radial tubes. X 26. 



Fig. 4. The same. The ridges belong to the inner surface of the gastral wall, 

 more fully illustrated in the preceding figure. The edge of the specimen 

 is beveled, giving the canals an elongated shape. The large perforations 

 in the lower part of the figure are the rhombic pits of the gastral surface. 

 They are covered over with a plexus of minute spicules, to which reference 

 has been made in the text. X 26. 



Fig. 5. One of the rhombic depressions of the outer wall enlarged, showing 

 the diagonal canals and the radial tube at the bottom. X 26. 



Fig. 6. Another view of the same. X 26. 



Fig. 7. Fractured surface showing the crushed radial tubes. X 26. 



