PLATE 4. 



Geodinella robusta Lendenfeld. 



Figs. 1, 4-7, 13, 21, 22. — var. megasterra Lendenfeld. 

 Figs. 2, 3, 8-12, 14-20. — var. carolae Lendenfeld. 

 Figs. 23-25. — var. megaclada Lendenfeld. 



1. — A ray of an oxyaster of the choanosome of var. megasterra; magnified 1800; u. v. phot., Zeiss, 



q. monochr. 1.7, q. oc. 10. 



2. — A sphaeraster with blunt conic rays of var. carolae; magnified 1800; u. v. phot., Zeiss, q. monochr. 



1.7, q. oc. 10. 



3. — A small oxyaster (oxysphaeraster) of var. carolae; magnified 1800; u. v. phot., Zeiss, q. monochr. 



1.7, q. oc. 10. 



4. — A small oxyaster (oxysphaeraster) of tlie cortex of var. megasterra; magnified 1800; u. v. phot., 



Zeiss, q. monochr. 1.7, q. oc. 10. 



5. — Small oxyasters (oxysphaerasters) of the choanosome of var. ynegaslerra; magnified 1800; u. v. 



phot., Zeiss, q. monochr. 1.7, q. oc. 10. 



6. 7. — The two ends of a diactine (amphiox) spicule both ends of which are lobose, of var. megasterra; 



magnified 200; phot., Zeiss, apochr. 8, compens. oc. 6. 

 8-12. — Ends of diactine (amphiox or amphistrongyle) spicules of var. carolae; magnified 100; phot., 

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



8, 11, very blunt (strongyle) ends; 



9, 12, more tapering ends; 



10, an irregular end with a clade-like process. 



13. — Part of the surface of a normal sterraster of var. megasterra; magnifiod 1800; u. v. phot., Zeiss, 



q. monochr. 1.7, q. oc. 10: 

 a, the umbilicus. 



14, 15. — Surface of a sterroid of the specimen of var. carolae from Charlotte Sound; magnified 1800; 



u. v. phot., Zeiss, q. monochr. 1.7, q oc. 10: 

 14, focused on the summits of the uppermost rays; 15, focused 1.5 n lower. 



16. — A short amphistrongyle of the specimen of var. carolae from Charlotte Sound; magnified 100; 



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



17. — The rounded end of a subtylostyle of the specimen of var. carolae from Charlotte Sound; magni- 



fied 100; phot., Zeiss, apochr. 16, compens. oc. 6. 

 18-20. — Strongylosphaerasters of the cortex of the specimen of var. carolae from Charlotte Sound; 

 magnified 1800; u. v. phot., Zeiss, q. monochr. 1.7, q. oc. 10. 



21. — Small oxyaster (oxysphaeraster) of the choanosome of var. megasterra; magnified 1200; u. v. 



phot., Zeiss, q. monochr. 2.5, q. compens. oc. 10. 



22. — Oxyaster of the choanosome of var. megasterra; magnified 1200; u. v. phot., Zeiss, q. monochr. 



2.5, q. oc. 10. 



23-25. — Parts of megascleres of var. megaclada; magnified 200; phot., Zeiss, apochr. 8, compens. oc. 6: 



23, cladome of an orthomonaene with not quite terminal clade; 



24, end of a blunt amphiox; 



25, central part of a mesomonaene. 



