428 DR F. A. BATHER. 



was unable to refer to the scheme of classification which I laid before the British 

 Association in 1898 (pubd. Feb. 1899), I, for my part, could not do more than insert 

 the briefest reference to his new genera (Nov. 1899) in the final paged proofs of the 

 "Treatise" (Feb. 1900). In these circumstances it is highly satisfactory to find how 

 closely we agree in our descriptions of structure, especially in the numerous features 

 that had not previously been observed, and how often we have arrived at the same 

 conclusions concerning the affinities of difficult genera and the circumscription of 

 minor groups. The differences between us depend rather on a different attitude of 

 mind, and consequently affect those hypotheses in the framing of which one is forced 

 to build on a somewhat imaginative foundation. When we agree, we are very likely 

 to be right. When we differ, the future writer with more facts will probably differ 

 from us both. 



§ 269. For convenience of reference, the classification of Prof. Jakkel is given here. 



Regularia. 

 Chirocrinidae. 



Chirocrinus. 

 Cystoblastidae. 



Cystoblastus. 

 Pleurocystidae. 



Pleurocystites. 

 Scoliocystidae. 



Ecliinoencrinites. 



Erinocystis. 



Glaphyrocystis. 



Scoliocystis. 



Prunocystites. 



Schizocystis. 

 Callocystidae. 



Glyptocystinae. 



Glyptocystites {multiporus only). 

 Apiocystinae. 



Meekocystis [ = Lepadocystis P.H.C.]. 



Apiocystites. 

 Staurocystinae. 



Pseudocrinites. 



Staurocystis. 

 Callocystinae. 



Hallicystis. 



Sphaerocystites. 



Callocystites. 



