PLATE X. (bis.) 



Cyclocystoides Halli (page 86). 



Figure 1. Impression of the marginal plates in a fragment of limestone. 



" 2. A different specimen, shewing twenty-six of the marginal plates, c and b, 

 the tube. 2d*, tube enlarged. 2*, marginal plates enlarged. 



3. Marginal plates enlarged. 



4. A portion of the disc enlarged. 



5. A small specimen nearly perfect. 5*, portion of margin enlarged. 



6. Portion of a specimen partly destroyed by the application of acid. 

 T. Part of 6 enlarged. 



Cyclocystoides Davisii (page 89). 



Figure 8. Cast of a specimen with margin perfect. 



" 9. Portion of margin magnified. 



" 10. Ideal section of Cyclocystoides. 



" 11. Pentagonal Star-fish. 



" 12. Amygdalocystites fiorealis. 



" 12. Pseudocrinites magnificus. 

 The three latter figures are given for comparison. 



