PLATE 30. 



Eurete erectum Schulze. 



Figures 1-17. y 



1-3. — Side-views of gastral pinules (pinule-derivates) ; magnified 200; phot. Zeiss, apochr. 8, compens. 

 oc. 6. 



4. — The dermal face of the skeleton-net; magnified 6.6; phot. Zeiss, planar 50 mm. 



5. — The gastral face of the skeleton-net; magnified 2.1; phot. Zeiss, anastig. 167 mm. 



6. — The gastral face of the dictyonal skeleton-net; magnified 6.6; phot. Zeiss, planar 50 mm. 



7. — Transverse section through the dermal zone of the tube-wall; magnified 100; phot. Zeiss, apochr. 



16, compens. oc. 6: 



a, lateral rays of dermal pinules; c, flagellate chambers; d, distal ray of a dermal pinule; e, 

 dermal spine of the skeleton-net; f, skeleton-net. 



8. — Apical view of a gastral pinule-derivate; magnified 200; phot. Zeiss, apochr. 8, compens. oc. 6. 



9. — Side-view of a gastral pinule; magnified 200; phot. Zeiss, apoclu'. 8, compens. oc. 6. 



10. — Transverse section through the dermal zone of the tube-wall; methyl-violet; magnified 100; 



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



a, lateral rays of dermal pinules; c, flagellate chambers; d, distal ray of dermal pinule; e, 

 dermal spine of the skeleton-net; f, skeleton-net. 



11. — View of portion of the gastral face of the skeleton-net; magnified 20; phot. Zeiss, planar 20 mm. 



12. — Transverse section through the tube-wall; magnified 30; phot. Zeiss, planar 20 mm.: 



a, lateral rays of dermal pinules; b, lateral rays of gastral pinules; d, distal ray of dermal 

 pinules; f, skeleton-net; g, gastral si)ines of the skeleton-net; h, distal rays of gastral pinules. 



13. 14. — Apical views of gastral pinules (pinule-derivates); magnified 200; phot. Zeiss, apochr. 8, 



compens. oc. 6. 



15. — Transverse section through the gastral zone of the tube-wall; magenta; magnified 100; phot. 



Zeiss, apochr. 16, compens. oc. 6; 



b, lateral rays of gastral pinules; i, gastral scopules. 



16. — View of the sponge; magnified 1.2; phot. Zeiss, anastig. 480/412 mm. 



17. — Transverse section through the tube-wall; magenta; magnified 30; [jhot. Zeiss, planar 20 mm.: 



a, lateral rays of dermal pinules; b, lateral rays of gastral pinules; c, flagellate chambers; d, 

 distal rays of dermal pinules; f, skeleton-net; g, gastral spines of the skeleton-net: h, distal 

 rays of gastral pinules; i, gastral scopules. 



