PLATE 69. 



Hyalonema (Hyalonema) sp. 

 Figs. 1-5. Station 46.56. 



1, 2. — Pinules; magnified 300; phot. Zeiss, apochr. 8, compens. oc. 6. 

 3-5. — Amphidiscs; magnified 500; phot. Zeiss, apochr. 4, compens. oc. 12. 



Hyalonema (Hyalonema) tylostylum Lendenfeld. 

 Figures 6-25. 



6. — A hexactine megasclere; magnified 50; phot. Zeiss, planar 20 mm., compens. oc. 6. 



7. — A hypodermal pentactine; magnified 50; phot. Zeiss, planar 20 mm., compens. oc. 6. 



8. 9. — Normal tylostyles; magnified 100; phot. Zeiss, apochr. 16, compens. oc. 6. 



10. — The tyle-bearing part of an abnormal tylostyle; magnified 100; phot. Zeiss, apochr. 16, compens. 

 oc. 6. 



11-13. — Amphiox megascleres; magnified 50; phot. Zeiss, planar 20 mm., compens. oc. 6. 

 14—25. — Amphidiscs and parts of such; magnified 500: 



14, a large macramphidisc; phot. Zeiss, apochr. 8, compens. oc. 12; 



15-18, micramphidiscs; phot. Zeiss, H. I. apochr. 2, compens. oc. 6; 



19, centrum and one anchor of a large macramphidisc; phot. Zeiss, H. I. apochr. 2, compens. oc. 6; 



20, a small macramphidisc; phot. Zeiss, apochr. 4, compens. oc. 12; 



21, a small macramphidisc; phot. Zeiss, H. I. apochr. 2, compens. oc. 6; 



22, 23, small macramphidiscs; phot. Zeiss, apochr. 4, compens. oc. 6; 



24, 25, the central tyle of the shaft of two large macramphidiscs; phot. Zeiss, apochr. 8, compens. 

 oc. 12. 



