U.S. NATIONAL MUSEUM 



BULLETIN 272 PLATE 8 



Figures 1-13. — 1, Megascleres, Heterorotula capezvelli; 2, megascleres, H. nigra; 3, mega- 

 scleres, H. multideritata; 4, megasclere, H. multiformis; 5, gemmule, H. capewelli, optical 

 sect.; 6, gemmule, H. nigra, optical sect, and enlarged porus tube; 7, gemmule, H. multi- 

 dentata, optical sect.; 8, range of gemmoscleres, H. capewelli; 9, range of gemmoscleres, 

 H. nigra; 10, range of gemmoscleres, H. multidentata; 11, rotules of gemmoscleres, H. 

 multidentata; 12, range of gemmoscleres, H. multiformis; 13, malformed gemmoscleres, 

 H. multidentata, probably a result of hybridization. 



