PLATE Xin. 



Arthroacantha punctobrachiata (page 9ti). 



Figure 1. Side view of a specimen of the dorsal cup of this species, from 



Bartlett's Mills. 

 Figure la. Similar view of another specimen from the same locality, in which 

 the summit is completely filled by a Platyceras- 



Megistocrinus, Sp. Indt. (page 101). 



Figure 2. Side view of the central dome plate. 

 Figure 2a. End " 

 Figure 26. Basal " 



Spine or Dome of Crinoid (page 102). 



Figure .3. Side view of the spine. 

 Figure 3a. Basal view of the same. 



Ollacrinus spinigerds (page 103). 



Figure 4. Side view of an unusually perfect specimen from Thedford. 

 Figure 4a. The same, as seen from above, shewing the dome plates. 

 Figure 45. The same, as seen from below. 

 All enlarged four times. 



Anctrocrinits bulbosus (page 103). 



Figure 5. Side view of a worn specimen of the root and part of the column of 

 this species. 



