250 



Trof. J. W. Gregory — Foml Echinoidea 



The relations of those species of Heminster and Li'nlhia having 

 forms similar to L. ohlonga can only be satisfactorily determined by 

 a careful study of the specimens from the Mediterranean Cenomanian 

 and Turonian series. This study would show whether the many 

 accepted species of Hemiaster in that fauna are mutations or 

 individual variations. 



Distrilmtion. — Cenomanian and Turonian : Algeria, Palestine, near 

 Suez, Cephalopod bed, head of Wadi Ethal. L 3918. Collected 

 by the late T. Barron, Esq. 



List of Mesozoic Echinoids descrihed in the foregoing paper, 

 giving their dlstriliution in the various localities. 



