572 



Humphreys : An analogy 



versa. 



Above these there are again entire leaves. 



It is not to be 



understood, however, that this arrangement holds good in all speci- 

 mens, for while it seems to be a fact that all of them have entire 

 leaves below, with lobed ones following, it is not invariably the 



Fig. ia. Encrinus It H if or mis. Dia- 



FlG. lb. Flatycrinus hemispheric 



gram of arms, showing arrangement and Diagram of part of arm group, showing 

 shape of plates. Reproduction of Gra- similar conditions. Reproduction of Gra- 

 bau's fig. ia. 



bau/s fig. 7. 



The numbers on the figures represent the serial numbering of the plates, 



coun 



ted 



from the basal one upward, 



case that there are nothing but entire leaves above. A number of 

 specimens were found in which there were no entire leaves at the 



top, and others on which the entire and lobed ones were 



mixed. 



Examples of two branchlets with the leaf forms and arrangement 

 above described are shown in figures 2a and 2b. 





