PLATE 31. 



Geodia agassizii Lendenfeld (adult). 

 Figures 1-10. 



-10. — Parts of fully developed sterrasters; magnified 1800; u. v. phot. Zeiss, q. monochr. 1.7, q. 

 oc. 10: 



1, 2, the umbilical side of a normal sterraster of a specimen from Station 3088; 



1, focused higher; 



2, focused lower; 



3, 4, the umbilical side of a sterroid with large terminal extensions of the rays, of a specimen 

 from Station 4193; 



3, focused higher- 



4, focused lower; 



5, the umbilical side of a sterraster of a specimen from Station 4193, focused just above the bottom 



of the umbilical pit to show the roughness of its sides ; 



6, 7, the umbilical side of a normal sterraster of a specimen from Station 4193; 



6, focused higher; 



7, focused lower; 



8-10, the umbilical side of a sterroid of a specimen from Station 3088, with few and large, rough 

 spines on the ends of the rays, focused in three levels about 2 /i apart; 



8, focused high; 9, focused intermediate; 10, focused low. 



