PLATE 25. 



Holascella euonyx Lendenfeld. 

 Figures 1-24. 



1. — The end of a ray of an onychhexactine; magnified 2000; u. v. phot. Zeiss, q. monochr. 1.7, q. oc. 10. 



2, 3.— 'I'he end of a ray of a large discohexactine; magnified 2000; u. v. phot. Zeiss, q. monochr. 1.7, 



(]. 00. 10: 



2, i'ocussed higher; 3, focussed lower. 

 4, 5. — The end of a ray of a large discohexactine; magnified 2000; u. v. phot. Zeiss, q. monochr. 1.7, 

 q. oc. 10: 



4, focussed higher; 5, focussed lower. 

 6. — The end of a ray of an onychhexactine; magnified 2000; u. v. phot. Zeiss, q. monochr. 1.7, q. oc. 10. 

 7-9. — Onychhexactines and hemionychhexaster; magnified 300; phot. Zeiss, apochr. 4, compens. oc. 6: 



7, 9, onychhexactines; 8, a hemionychhexaster. 

 10, II. — Large discohexactines; magnified 300; phot. Zeiss, apochr. 4, compens. oc. 6. 



12. — Apical view of the terminal spine-verticil (end-disc) of the upstanding ray of the large discohexac- 



tine represented in fig. 11; magnified 300; phot. Zeiss, apochr. 4, compens. oc. 6. 



13. — Group of microscleres from a spicule-preparation ; magnified 300; phot. Zeiss, apochr. 4, compens. 



oc. 6: 



a, small discohexasters; b, onychhexactine. 



14. 15. — Side-view of superficial hexactines; magnified 100; phot. Zeiss, apochr. 16, compens. oc. 6. 



16. — The central part of a large tetractine principal spicule; magnified 100; phot. Zeiss, apochr. 16, 



compens. oc. 6. 



17. — View of the specimen; reduced 1: 0.86; phot. Zeiss, Tessar 250 mm. 



18. — A tetractine comital spicule; magnified 100; phot. Zeiss, apochr. 16, compens. oc. 6. 



19. 20. — Two groups of comital and other medium-sized spicules; magnified 100; phot. Zeiss, apochr. 



16, compens. oc. 6. 



21, 22. — The distal part of the distal ray of a superficial hexactine; magnified 600; phot. Zeiss, H. I. 

 a])ochr. 2, compens. oc. 6: 

 21, focus.sed higher; 22, focussed lower. 

 23, 24. — The distal part of the distal ray of a superficial hexactine; magnified 600; phot. Zeiss, H. I. 

 apochr. 2, compens. oc. 6: 

 23, focussed higher; 24, focussed lower. 



Farrea occa scutella Lendenfeld. 

 Figures. 25-29. 



25-29. — Small hexactines, attached and free; magnified 200; phot. Zeiss, apochr. 8, compens. oc. 6: 



25, a hexactine attached to a stout beam of the main network; 



26, a free hexactine; 



27, 28, hexactines attached to slender beams; 

 29, hexactine attached to a medium beam. 



