PLATE 5. 



Calycosilva cantharellus Lendenfeld. 



Figs. 1, 2, 4, 5, 7-9, 11-15, 18-20 — var. helix Lendenfeld. 

 Figs. 3, 6, 10 — var. (B) simplex Lendenfeld. 



Figs. 16, 17 — var. (A) simplex Lendenfeld. 



Fig. 21 — var. megonychia Lendenfeld. 



1. — Radial section through a part of the body near the margin, of var. helix; magnified 20; phot. Zeiss, 



planar 20 mm.: 



a, gastral pinule-fur; b, hypogastral oxypentactines; c, subgastral rhabd-bundles ; d, choano- 

 somal rhabds and oxyhexactines ; e, subdermal rhabd-bundles; f, hypodermal oxypentac- 

 tines; g, dermal pinule-fur. 



2. — The end of a rhabd of var. helix; magnified 200; phot. Zeiss, apochr. 8, compens. oc. 6. 



3. — The skeleton of the basal end of var. simplex (B); magnified 6; phot. Zeiss, planar 50 mm. : 



a, fragment of a spicule, probably a root-spicule, of Hyalonema sp., to which the Calycosilva is 

 attached; b, the basal part of the skeleton of the Calycosilva. 



4. — Radial section through part of the body of var. helix; magenta; magnified 20; phot. Zeiss, planar 



20 mm.: 



a, gastral pinule-fur; b, hypogastral oxypentactines; c, subgastral rhabd-bundles; d, choano- 

 somal rhabds and oxyhexactines; e, subdermal rhabd-bundles; f, hypodermal oxypentac- 

 tines; g, dermal pinule-fur. 

 5-7. — Parts of the basal skeleton-net; magnified 100; phot. Zeiss, apochr. 16, compens. oc. 6: 



5, 7, from the stalk of var. helix; 



6, from the lattice-work which surrounds the spicule-fragment forming the base of attachment 



of var. simplex (B). 



8, 9. — The central part of two rhabds of var. helix; magnified 200; phot. Zeiss, apochr. 8, compens. oc. 6: 



8, of a simple rhabd; 



9, of a centre tyle rhabd. 



10. — The sectioned face of var. simplex (B), longitudinally cut in two; magnified 1.7; phot. Zeiss, anastig. 



480/412 mm.: 



a, fragment of a spicule, probably a root-spicule, of a Hyalonema sp., to which the Calycosilva 

 is attached; b, the Calycosilva. 



11. — Radial section through the margin of the body of var. helix; magnified 20; phot. Zeiss, planar 



20 mm. : 



a, gastral pinule-fur; g, dermal pinule-fur; h, margin. 

 12-15. — Ends of rhabds of var. helix; magnified 200; phot. Zeiss, apochr. 8, compens. oc. 6: 

 12, 13, the two ends of a nearly isoactine amphistrongyle rhabd; 

 14, 15, the two ends of a tylostyle rhabd. 



16. — Axial, longitudinal section through the upper end of the stalk and the adjacent (central) part of 



the body of var. simplex (A); magnified 6; phot. Zeiss, planar 50 mm.: 

 a, gastral pmule-fur; b, choanosome; c, stalk; g, dermal pinule-fur. 



17. — Onychhexaster of var. simplex (A); magnified 300; phot. Zeiss, apochr. 4, compens. oc. 6. 



18. 19. — Onychhexasters of var. helix; magnified 200; phot. Zeiss, apochr. 8, compens. oc. 6 



20. — • The central part of a diactine the two actines of which enclose nearly a right angle, of var. helix; 



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



21. — The central part of a triactine of var. megonychia; magnified 200; phot. Zeiss, apochr. 8, compens. 



oc. 6. 



