U.S. NATIONAL MUSEUM 



BULLETIN 272 PLATE 4 



8 



lO 



17 



* 



18 



Figures 1-18. — 1, Megasclere, Corvospongilla lapiaosa; 2, 3, microscleres, C. lapidosa; 4, 

 megasclere, C. hohmii; 5, 6, microscleres, C. hbhmii; 7, megasclere, C. caunteri; 8-10, 

 microscleres, C. caunteri; 11, megasclere, C. ultima; 12, gemmoscleres and microsclere, 

 C. ultima; 13, microsclere, C. ultima; 14, 15, megascleres, C. scabrispiculis; 16, gemmo- 

 sclere, C. scabrispiculis; 17, 18, microscleres, C. scabrispiculis. 



