280 BULLETIN OF THE 



Diademu antillarum Phil. 



Garelia cincta A. Ag. 



Eehinocidaris punctulata Desml. 

 " sequituberculata Ag. 



Echinometra VanBrunti A. Ag. 



Toxopncustes drobachiensis Ag. 



Echinus Flemingii Ball. 

 " melo Lam. 

 " gracilis A. Ag. 



Sphaereehinus brevispinosus Des 



Teranotrema sculptum A. Ag. 



Toreumatica concava Gray. 



Genocidaris maculata A. Ag. 



Trigonocidaris albida A. Ag. 



Lytechinus variegatus A. Ag. 



Tripneustes ventricosus Ag. 



Boletia granidata A. Ag. 



Echinocyamus angulosus Leske. 



Clypeaster rosaceus Lam. 



Stolonoclypus prostratus A. Ag. 



Echinaraclinius parma Gray. 



Encope emarginata Ag. 



Mellita testudinata Kl. 

 " hexapora Ag. 

 " longifissa Mich. 



Fibularia volva Ag. 



Echinolampas caratomoides A. Ag. 



Echinocardium cordatum Gray. 



Brissops'is lyrifera Ag. 



Agassizia excentrica A. Ag. 



I doubt if without the aid of the information gained by the study of 

 these young Echini a satisfactory report of this collection could have 

 been made. The changes some species undergo arc so great that 

 nothing would have been more natural than to place the two extremes 

 of the series not only in different specie-:, but often in different genera, 

 and even in different families. As a necessary consequence, the study 

 of these young, showing what we may consider differences due only to 

 growth, will load to the elimination of numerous species and genera, 



