262 SPONGE-EEMAINS IJT THE TEETIARY OF NEW ZEALAND. 



Figs. 12, 13. Two forms of rosette spicules of Crateromorpha (a), (b). X 200. 

 Many of the rays in these spicules are imperfect, having been broken 



Pig. 14. Amphidisc spicule of Hyalonema (a) with four i-ays. X 100. 



Figs. 15, 16. Two forms of amphidisc spicules of Hyalonema (b), (c). X 200. 



Fig. 17. Amphidisc spicule with eight elongate rays at each end, Hyalonema (d). 



X 200. 

 Figs. 18, 19, 20. Different forms of amphidisc spicules of Hyalonema (e), (f), 



(g). Figs. 18, 20 X 100 ; fig. 19 X 300. 

 Figs. 21, 26. Small amphidisc spicules. Fig. 21 X 200 ; fig. 26 X 300. 

 Fig. 22. Distal end of anchoring-spicule of Hexactinellid. X 20. 



23. Distal end of anchoring-spicule of Pherojiema (a) with barbed shaft and 



harpoon-like head. X 200. 



24. Upper portion of scopule spicule of Aphrocallistes (a), x 300. 



25. Portion of shaft and rays of scopule spicule. X 300. 



27. Detached five-rayed spicule of Hexactinellid. X 200. 



28. Detached four-rayed spicule of Hyalonema. X 100. 



29. Spined four-rayed spicule. X 100. 



30. Slender spined six-rayed spicule. X 200. 



31. Six-rayed spicule of Crateromorpha (c). X 100. 



32. Slender six-rayed spicule with prominent spines. X 200. 



33. Slender five(?)-rayed spicules in their natural position with respect to 



each other. X 200. 



34. Fragment of spicular mesh of dictyonine Hexactinellid. X 200. 



