BY W. M. BALE. 797 



Plate XV. 



Fig. 1. — Sertularella indivisa. Bale. Port Phillip. 



Fig. 2.— „ ,, Portland, Vict. 



Fig. 3. — ,, solichda. Bale. Port Phillip, 



Fig. 4.— ,, ,, Bondi. 



Fig. 5-7.— ,, variabilis, n.sp. Port Jackson. 



Fig. 8. — „ „ a variety with longer teeth. 



Fig, 9. — „ " ,, a slender variety, vi^ith calycles nearly 



smooth, and. directed to the front so as to show inside the aperture. 



{All marjnified 40 diameters.) 



Plate XVI. 



Fig. 1-2. — Sertularella divaricata, Busk, var. dubia, n. var. Bondi. 



Fig. 3-4. — ,, divaricata, var. sub-dichotoma, n. var. Port Jackson. 



Fig. 5-6. — ,, longitheca, n.sp. Port Denison. 



Fig. 7. — ,, cylindrica, n.sp. Port Jackson. 



Fig. 8. — ,, microgona, v. Lend. Poi't Phillip. (From one of 



Dr. von Lendenf eld's types) 



(All magnified 40 diameters). 



Plate XVII. 



Fig, 1-2. — Synthecium orthogonia, Busk. Port Jackson, 



Fig. 3. — ,, ,, a specimen with calycles directed towards 



the front. 



Fig. 4. — Synthecium orthogonia, gonotheca, narrower aspect. 



Fig. 5. — ,, ,, broader aspect. 



Fig. 6-9. — Sertularia geniculata, n.sp. Port Jackson. 



Fig. 10-11. — ,, „ gonothecse. 



{All magnified 40 diameters). 



Plate XVIII. 

 Fig. 1-2. — Sertularia complexa, Cldivke. Bondi. x 40. 

 Fig, 3-4. — ,, ,, gonothecae. x 40. 



Fig. 5. — Thuiaria suharticulata, CoMghtrey . New Zealand. x25. 



