REPORT OF THE DIRECTOR I9IO 



217 



post. B, and 1. post. IB were badly shattered and the greater portion 

 of the surface of these plates was left on the bed. For an enlarged 



..'-\ 



Fig. 4 Analysis of Palaeocrinus striatus Billings. The following abbreviations are 

 used here and in the text: I = left, r aright, ant. — anterior, post. = posterior, IB = infrabasal 

 B^ basal, R = radial, RA=radianal and x = anal. The dotted boundaries show probable 

 edges of plates where covered. The marks lying between plate corners are supposed centers of 

 development of branchial vesicles. 



view of part of this area see plate 6, figure i. Mr Billings realized 

 the difficulty of determining the character of the damaged area for 

 under the cut representing his cup analysis, he said '' The azygos 



Fig. 5,6 Different aspects of the holotype of Palaeocrinus striatus Billings, X31 



interradial space is left blank in the figure as it is not certain how 

 many plates it contains." 



Method used to determine sutures. For a long time the writer 

 tried to see the sutures of the injured area with a three inch objective 



