PLATE 70. 



Hyalonema (Hyalonema) tylostylum Lendenfeld. 

 Figures 1-10. 



1, 2. — Dermal pinules; magnified 300; phot. Zeiss, apochr. 4, compens. oc. 6. 



3. — Part of a radial section through the superficial part of the sponge and the pinule-fur; magnified 100; 



phot. Zeiss, apochr. 16, compens. oc. 6: 



a, a large macramphidisc; b, dermal pinules. 



4. — A microhexactine; magnified 500; phot. Zeiss, H. I. apochr. 2, compens. oc. 6. 



5. — Group of spicules in a centrifuge spicule-preparation; magnified 200; phot. Zeiss, apochr. 8, com- 



pens. oc. 6: 



a, microhexactines; b, a micropentactine; c, a micramphidisc. 



6. — • View of the smaller specimen; reduced 100: 91; phot. Zeiss, anastig. 480/412 mm. 



7. — A microhexactine; magnified 200; phot. Zeiss, H. I. apochr. 2, compens. oc. 6. 



8. — Surface view of the dermal pinule-fur; magnified 100; phot. Zeiss, apochr. 16, compena. oc. 6. 



9. 10. — Gastral pinules; magnified 300: 



9, phot. Zeiss, apochr. 8, compens. oc. 12; 



10, phot. Zeiss, apochr. 4, compens. oc. 6. 



Hyalonema (Prionema) pinulifusum Lendenfeld. 

 Figures 11-24. 



11-24. — Pinules; magnified 300; phot. Zeiss, apochr. 4, compens. oc. 6: 

 11-14, small, probably canalaria; 

 15-19, large; 

 20-24, medium. 



