U.S. NATIONAL MUSEUM 



BULLETIN 272 PLATE 13 



Figures l-l.i. — 1, Stouter mcgasclere, Uruguaya coraUiotdes; 2, slender megasclere, U. 

 corallioides; 3, stouter megasclere, U. macandreivi; 4, slender megasclere, U. macandrezvi; 

 5, megascleres, U. repens; 6, 7, megascleres, Jcalle recurvata; 8-12, birotulate gemmoscleres 

 found in slide of type, A. recurvata; 13, tubelliform gemmoscleres of inner series, A. 

 recurvata. 



