sutures are one and the same set of sutures, since the evidence that bot b exist in any one specimen is noi 

 quite conelusive. Pl. Il, Figs. 70 and 72 suggest that the canals to the paired cirri nctually rim along the 

 suture. If tliis be the true interpretation, then the ancestral sinn of Hcrpetocrinns would still consist of 5 

 parts or pentaineres, and would probably have borne whorls of 5 cirri; but the cirri, the sutures and the 

 angles of the axial canal would have tln- same orientation, as required by WACHSMUTH and Springers law. 

 This explanation, however, has its own difficulties, so that 1 am as yet imable to come to any salisfactorj 

 decisiou. 

 8. Articular surface of a coluranal of //. Avimonis, from a specimen in the British Museum. This is fullj 

 described on p. 42. The appearauces presented by this surface should be carcfully cflmpared with the intimate 

 structure as disclosed bv trausection, as well as with the various sections and surfaces delincated in the Plates. 



