PLATE 81. 



Hyalonema (Leptonema) campanula Lendenfeld. 

 Figures 1-26. 



I, 2. — Parts of a diactine pinule; magnified 300; phot. Zeiss, apochr. 8, compens. oc. 12: 



1, the middle- and end-parts of the distal ray; 



2, the central part of the spicule. (The lower end of fig. 1 fits on to the upper end of fig. 2). 

 3-6. — Micro hexactines; magnified 500; phot. Zeiss, apochr. 4, compens. oc. 12: 



3, a larger one, focussed lower; 4, focussed higher; 5, a smaller one, focussed lower; 6, focussed 

 higher. 



7-10. — Macramphidiscs, and a part of one, magnified 500: 

 7, 8, phot. Zeiss, apochr. 8, compens. oc. 12; 

 9, 10, phot. Zeiss, H. 1. apochr. 2, compens. oc. 6; 



7, a macramphidisc with straight shaft; 



8, a macramphidisc with strongly bent shaft; 



9, a macramphidisc with slightly bent shaft, focussed low (on the shaft); 



10, the lower of the two anchors of the spicule represented in fig. 9 focussed higher (on the tips 

 of the upper teeth) . 



II. — Part of a stalk-spicule; magnified 30; phot. ZeLss, planar 20 mm. 



12, 13. — Two pentactine pinules with long and slender distal ray; magnified 100; phot. Zeiss, apochr. 

 16, compens. oc. 6. 



14. — Part of a group of diactine pinules; magnified 100; phot. Zeiss, apochr. 16, compens. oc. 6. 



15. — View of the specimen; natural size; phot. Zeiss, anastig. 480/412 mm. 



16-18. — Three pentactine pinules with long and slender rays; magnified 300; phot. Zeiss, apochr. 8, 

 compens. oc. 6. 



19, 20. — Apical views of the lateral rays of two pentactine megascleres; magnified 50; phot. Zeiss, 



apochr. 10, compens. oc. 2. 

 21, 22. — Micramphidiscs; magnified 500; phot. Zeiss, apochr. 4, compens. oc. 12. 

 23, 24. — Mesamphidiscs; phot. Zeiss, apochr. 8, compens. oc. 12. 



25, 26. — Pentactine pinules with short and stout distal ray from the basal part of the sponge; magnified 

 300; phot. Zei.ss, apochr. 8, compens. oc. 12; 



25, a single one; 



26, a group in situ in a section. 



