PLATE 4. 



Geodinella robusta Lendenfeld. 



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

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

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



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



q. moiiochr. 1.7, q. oc. 10. 

 2. — A spliaeraster 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. earolae; magnified ISOO; u. v. phot., Zeiss, q. monochr. 



1.7, q. oc. 10. 

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



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

 5. — Small oxyasters (oxysphaerastcrs) of the choanosome of var. megasterra: magnified 1800; ii. v. 



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

 fi, 7. — The two ends of a diactine (amphiox) spicule both ends of which are lohose, 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. IC, compens. oc. 6: 



8, 11, very blunt (strongyle) ends; 



9, 12, more tapering ends; 



10, an irregular enrl with a clailo-like process. 



13. — Part of the surface of a normal sterraster of var. mejaxterra; magnified ISOO; vi. v. phot., Zeiss, 



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

 a, the umbilicus. 

 14, 15. — S\irfacc of a sterroid of the .si)eeinien of var. roro/<ie 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 /i lower. 

 16. — A short amphi.strongj'le of the specimen of var. carolae from Charlotte Souml; 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. — Strongj'losphaerasters 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 oxj'aster (oxysphaeraster) of the choanosome of var. megasterra; magnified 12U0; 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. pc. 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. 



