PLATE II. 



Dkxdronixa, gen. ii. 



Figs. 1-6. Dcndronina limosa, sp.n. No. 70. 



-A sessile speeinien with globular basal chamber and two tubes arising from it (tubes broken). 



-Basal chamber of a free specimen with cheval-de-frise of spicules. 



-A young individual showing constriction of tube to form a nipple-shaped aj)crture (unbroken) 



and basal spicules. 

 -A similar specimen with three trunks, laid ojjen at base to show rudimentary labyrinthic structure. 

 -A young individual to show constriction of ajjertural end of tube (unbroken). The oval bodies 



arc sterrasters of a Geodia, and the s]jecimen was j)robably sessile on the sjjonge. 

 Fig. 6. — Suj)erior view of a sessile specimen with irregularlv globular basal chamber. The central space 



shows the line of fracture of a double trunk arising from the basal chamber and indicates 



the thickness of the wall of the chamber. 



Figs. 7-9. Dendronina limosa, var. humilis, nov. No. 77. 



Fig. 7. — Section showing labjTinthic base, swollen cavity of trunk above it. and simjjle tube with con- 

 stricted aperture at the top. 

 Fig. 8. — Basal view, showing labyrinthic structure. 

 Fig. 9. — Side view, showing constricted simple aj)erture at the end of the short trunk. 



Figs. 10-12, 14-18. J)cndi<»ii}>a urborescens, sp.n. No. 74. 



Fig. 10. — A young sessile specimen with regularly formed basal pad and slender trunk (fragment). 

 Figs. 11, 16. — Free growing specimens showing the bulbous basal chamber. 

 Fig. 12. — Semi-diagrammatic restoration of large specimen. 



A. — The basal pad ; B. — The trunk or principal tube ; C. — A secondary tube with 



terminal corona of spines around aperture ; D. — A similar terminal aperture on a 



branch ; E. — Branches subdividing into branchlets ; F. — Abnormal terminal with 



spicular extensions. 

 Fig. 14. — A branchlet characterised by the abnormal size of the spicules cm2)loycd. Terminal aperture 



with spicular extensions at the top. 

 Fig. 1.5. — A fragment of a branch showing spiral arrangement of spicules. 

 Fig. 17. — The basal ])ad viewed as a transparent object. The darker radiating lines indicate protoplasm 



filling the radiating passages which converge on the central cavity from which the main 



trunk arises. 

 Fig. 18. — A branchlet viewed as a transparent object showing the continuity of the protoi)lasm. 



Figs. 1.3, 19. Dendronina arborescens, var. antarclica, nov. No. 15- 

 Fig. 13. — Detached sessile specimen showing labyrinthic structure of basal pud. 

 Fig. 19. — The incurved base shows that the specimen was originally sessile, and the broken top end of 



the trunk suggests a fracture at the point of furcation. 



Magn. X 25. 



