Plate II. 

 Pourtalesia Jeffreysi Wyv. Thoms. 



The ambulacral system coloured. 



Fi^-. 9. The skeleton, laid ont. The plates 2 b 1 aud ii a 1 are necessarily foreshorteneil. The heleroiiomy 

 of.the interradials i, b 4 and 1, b o + 2, p. 14, as also the corresponding plates 4 a 2, 4 a 3, 

 A a 4, are marked with arched, dotted lines. 



