108 



GEODIA MESOTRIAENA. 



from sixteen to twenty. The oxyasters attain a larger size in var. fuegana 

 than in the other two varieties. 



DIMENSIONS OF EUASTERS OF GEODIA MESOTRIAENA. 



The large oxysphaermters (Plate 24, figs. 5b, 7c, 8b) are 19-32 /j in total 

 diameter and have a spherical centrum 3-10 pt in diameter from which from fif- 



