34-38.— A large rhabd and parts of it: 13 s 
34, the rhabd; magnified 30; phot. Zeiss, planar 20 mm.; 
a, the part represented more strongly magnified in fig. 36; 
35-38, parts of the rhabd; magnified 200; phot. Zeiss, apochr. 8, compens. oc. 6; 
35, one end; 
36, portion near the end (at a, fig. 34) with a thickening of the axial thread; 
37, the other end; 
38, part of the thickest portion near the middle. 
39.— Group of spicules from a spicule-preparation; magnified 30; planar 20 mm.: 
a, large rhabd; b, small rhabd; ec, hemioxyhexasters with straight rays; d, oxyhexactine with 
hook-like rays; e, discoctaster. 
40-43.— Small, spined, dermal rhabds; magnified 200; phot. Zeiss, apochr. 8, compens. oc. 6: 
40, 41, with rudiments of other rays besides the fully developed two; 
42, 43, simple rhabds without such ray-rudiments. = 
