be left to posterity to solve definitely the question of the species to be 

 distinguished within the forms belonging to the circle of — especially — 

 Encope rnicropora. I cannot help also thinking how many species Clark, 

 on the base of the study of a similar rich material of the Caribbean Encope 

 emarginata might have made out of that polymorphic species. 



I hope that by the itw corrections and additions introduced in this 

 manuscript I am doing justice to my late, lamented friend, the eminent 

 echinologist, Hubert Lyman Clark. 



Copenhagen, in April 1948. 



Th. Mortensen 



xu 



