PLATE 11. 



Sidonops bicolor Lendenfeld. 

 Figures 1-17. 



1, 2. — A larger and a smaller strongylosphaeraster of a specimen from Station 4551; magnified 1800; 

 u. V. pilot. Zeiss, q. monochr. 1.7, q. oc. 10: 



I, focused higher; 2, focused lower. 



3-5. — Strongylosphaerasters; magnified 1800; u. v. phot. Zeiss, q. monochr. 1.7, q. oc. 10: 



3, 5, of a specimen from Station 2781; 



4, of a specimen from Station 3168. 



6-8. — Groups of euasters from a centrifugal spicule-preparation; magnified 1800; u. v. phot. Zeiss, q. 

 monochr. 1.7, q. oc. 10: 



6, a strongylosphaeraster (a) and a medium-sized oxyaster (b) of a specimen from Station 4551 ; 



7, a strongylosphaeraster (a), and an oxysphaeraster (b) of a specimen from Station 2781 ; 



8, a strongylosphaeraster (a) and a large oxyaster (b) of a specimen from Station 2781. 



9. — An oxyaster of a specimen from Station 2781 ; magnified 900; u. v. phot. Zeiss, q. monochr. 1.7, q. 



oc. 5. 



10. — Group of strongylosphaerasters of a specimen from Station 2781; magnified 900; u. v. phot. 



Zeiss, q. monochr. 1.7, q. oc. 5. 

 11-14. — Parts of the surface of sterrasters; magnified 1800; u. v. phot. Zeiss, q. monochr. 1.7, q. oc. 10 : 



II, 12, of the umbilical side of sterrasters of a specimen from Station 2958; 



13, of the side opposite the umbilicus of a specimen from Station 2781; 



14, of the side opposite the umbilicus of a specimen from Station 2958. 

 15-17. — Three specimens; natural size; phot. Zeiss, anastig. 480/ 412: 



15, 16, two specimens from Station 4420; 

 17, a specimen from Station 4551. 



