PLATE 17. 



Staurocalyptus hamatus Lendenfeld. 

 Figures 1-25. 



I- 8. — Hemioxyhexasters and microoxyhexactines; magnified 200; phot. Zeiss, apochr. 8, compens. 



oc. 6: 



1-3, microoxyhexactines with hook-like rays; 



4, homioxyhexaster with partly straight, partly hook-like rays (end-rays) ; 

 .5-8, hemioxyhexasters with straight rays. 

 9, 10. — Groups of spicules from spicule-preparations; magnified 200; phot. Zeiss, apochr. 8, compens 

 oc. 6: 



a, dermal rhabd; b, hemioxyhexasters with straight rays; c, microoxyhexactine with hook-like 

 rays, one of which is abnormally elongated; d, discoctasters; e, small discohexaster. 

 11, 12. — Two regular discoctasters with one main-ray axis parallel to the optical axis of the microscope; 



magnified 600; phot. Zeiss, H. I. apochr. 2, compens. oc. 6. 

 13. — Group of spicules from a .spicule-prcparation ; magnified 600; phot. Zeiss, H. I. apochr. 2, compens. 

 oc. 6: 



d, part of an irregular discoctaster; e, small discohexasters. 



II- 16. — Discoctasters with the three main (main-ray) axes oblique to the optical axis of the micro- 



scope; magnified 600: 

 1-4, an irregular discoctaster; phot. Zeiss, apochr. 4, compens. oc. 12; 

 15, 16, regular discoctasters; phot. Zeiss, H. I. apochi-. 2, compens. oc. 6. 

 17, IS. — Centre of a discoctaster with the three main (main-ray) axes oblique to the optical axis of 

 the microscope; magnified 2000; u. v. phot. Zeiss, q. monochr. 1.7, q. oc. 10: 

 17, focussed higher; IS, focussed lower. 

 19-23. — Centres of two tliscoctasters with one main-ray axis parallel to the optical axis of the micro- 

 scope; magnified 2000; u. v. phot. Zeiss, q. monochr. 1.7, q. oc. 10: 

 19, 20, of one discoctaster; 



19, focussed higher; 20, focussed lower; 

 21-23, of another discoctaster; 



21, focussed higher; 22, focussed lower; 23, focussed still lower. 

 24, 25. — End-rays of discoctasters; magnified 2000; u. v. phot. Zeiss, q. monochr. 1.7, q. oc. 10: 



24, of a large discoctaster; 



25, of a small discoctaster. 



