34-38. — A large rhabd and parts of it: 



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; c, hcmioxyhexasters with straight rays; d, oxyhcxactine 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. 



